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Lee HM, Park JH, Kim TH, Kim HS, Kim DE, Lee MK, You J, Lee GM, Kim YG. Effects of autophagy-inhibiting chemicals on sialylation of Fc-fusion glycoprotein in recombinant CHO cells. Appl Microbiol Biotechnol 2024; 108:224. [PMID: 38376550 PMCID: PMC10879319 DOI: 10.1007/s00253-024-13059-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2023] [Revised: 01/27/2024] [Accepted: 02/06/2024] [Indexed: 02/21/2024]
Abstract
The occurrence of autophagy in recombinant Chinese hamster ovary (rCHO) cell culture has attracted attention due to its effects on therapeutic protein production. Given the significance of glycosylation in therapeutic proteins, this study examined the effects of autophagy-inhibiting chemicals on sialylation of Fc-fusion glycoproteins in rCHO cells. Three chemical autophagy inhibitors known to inhibit different stages were separately treated with two rCHO cell lines that produce the same Fc-fusion glycoprotein derived from DUKX-B11 and DG44. All autophagy inhibitors significantly decreased the sialylation of Fc-fusion glycoprotein in both cell lines. The decrease in sialylation of Fc-fusion glycoprotein is unlikely to be attributed to the release of intracellular enzymes, given the high cell viability and low activity of extracellular sialidases. Interestingly, the five intracellular nucleotide sugars remained abundant in cells treated with autophagy inhibitors. In the mRNA expression profiles of 27 N-glycosylation-related genes using the NanoString nCounter system, no significant differences in gene expression were noted. With the positive effect of supplementing nucleotide sugar precursors on sialylation, attempts were made to enhance the levels of intracellular nucleotide sugars by supplying these precursors. The addition of nucleotide sugar precursors to cultures treated with inhibitors successfully enhanced the sialylation of Fc-fusion glycoproteins compared to the control culture. This was particularly evident under mild stress conditions and not under relatively severe stress conditions, which were characterized by a high decrease in sialylation. These results suggest that inhibiting autophagy in rCHO cell culture decreases sialylation of Fc-fusion glycoprotein by constraining the availability of intracellular nucleotide sugars. KEY POINTS: • The autophagy inhibition in rCHO cell culture leads to a significant reduction in the sialylation of Fc-fusion glycoprotein. • The pool of five intracellular nucleotide sugars remained highly abundant in cells treated with autophagy inhibitors. • Supplementation of nucleotide sugar precursors effectively restores decreased sialylation, particularly under mild stress conditions but not in relatively severe stress conditions.
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Affiliation(s)
- Hoon-Min Lee
- Biotherapeutics Translational Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), 125 Gwahak-ro, Yuseong-gu, Daejeon, Korea
- Department of Bioprocess Engineering, KRIBB School of Biotechnology, University of Science and Technology (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon, Korea
| | - Jong-Ho Park
- Biotherapeutics Translational Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), 125 Gwahak-ro, Yuseong-gu, Daejeon, Korea
- Department of Biological Sciences, KAIST, 335 Gwahak-ro, Yuseong-gu, Daejeon, Korea
| | - Tae-Ho Kim
- Biotherapeutics Translational Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), 125 Gwahak-ro, Yuseong-gu, Daejeon, Korea
- Department of Plant and Environmental New Resources, Graduate School of Biotechnology, College of Life Science, Kyung Hee University, 1732 Deogyeong-daero, Giheung-gu, Yongin-si, Gyeonggi-do, Korea
| | - Hyun-Seung Kim
- Biotherapeutics Translational Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), 125 Gwahak-ro, Yuseong-gu, Daejeon, Korea
- Department of Bioprocess Engineering, KRIBB School of Biotechnology, University of Science and Technology (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon, Korea
| | - Dae Eung Kim
- College of Pharmacy, Chungbuk National University, Cheongju, 28160, Korea
| | - Mi Kyeong Lee
- College of Pharmacy, Chungbuk National University, Cheongju, 28160, Korea
| | - Jungmok You
- Department of Plant and Environmental New Resources, Graduate School of Biotechnology, College of Life Science, Kyung Hee University, 1732 Deogyeong-daero, Giheung-gu, Yongin-si, Gyeonggi-do, Korea
| | - Gyun Min Lee
- Department of Biological Sciences, KAIST, 335 Gwahak-ro, Yuseong-gu, Daejeon, Korea
| | - Yeon-Gu Kim
- Biotherapeutics Translational Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), 125 Gwahak-ro, Yuseong-gu, Daejeon, Korea.
- Department of Bioprocess Engineering, KRIBB School of Biotechnology, University of Science and Technology (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon, Korea.
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Sunden M, Upadhyay D, Banerjee R, Sipari N, Fellman V, Kallijärvi J, Purhonen J. Enzymatic assay for UDP-GlcNAc and its application in the parallel assessment of substrate availability and protein O-GlcNAcylation. CELL REPORTS METHODS 2023; 3:100518. [PMID: 37533645 PMCID: PMC10391344 DOI: 10.1016/j.crmeth.2023.100518] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/19/2023] [Revised: 05/11/2023] [Accepted: 06/05/2023] [Indexed: 08/04/2023]
Abstract
O-linked N-acetylglucosaminylation (O-GlcNAcylation) is a ubiquitous and dynamic non-canonical glycosylation of intracellular proteins. Several branches of metabolism converge at the hexosamine biosynthetic pathway (HBP) to produce the substrate for protein O-GlcNAcylation, the uridine diphosphate N-acetylglucosamine (UDP-GlcNAc). Availability of UDP-GlcNAc is considered a key regulator of O-GlcNAcylation. Yet UDP-GlcNAc concentrations are rarely reported in studies exploring the HBP and O-GlcNAcylation, most likely because the methods to measure it are restricted to specialized chromatographic procedures. Here, we introduce an enzymatic method to quantify cellular and tissue UDP-GlcNAc. The method is based on O-GlcNAcylation of a substrate peptide by O-linked N-acetylglucosamine transferase (OGT) and subsequent immunodetection of the modification. The assay can be performed in dot-blot or microplate format. We apply it to quantify UDP-GlcNAc concentrations in several mouse tissues and cell lines. Furthermore, we show how changes in UDP-GlcNAc levels correlate with O-GlcNAcylation and the expression of OGT and O-GlcNAcase (OGA).
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Affiliation(s)
- Marc Sunden
- Folkhälsan Research Center, Helsinki, Finland
- Stem Cells and Metabolism Research Program, Faculty of Medicine, University of Helsinki, Helsinki, Finland
| | - Divya Upadhyay
- Folkhälsan Research Center, Helsinki, Finland
- Stem Cells and Metabolism Research Program, Faculty of Medicine, University of Helsinki, Helsinki, Finland
| | - Rishi Banerjee
- Folkhälsan Research Center, Helsinki, Finland
- Stem Cells and Metabolism Research Program, Faculty of Medicine, University of Helsinki, Helsinki, Finland
| | - Nina Sipari
- Viikki Metabolomics Unit, University of Helsinki, Helsinki, Finland
| | - Vineta Fellman
- Folkhälsan Research Center, Helsinki, Finland
- Stem Cells and Metabolism Research Program, Faculty of Medicine, University of Helsinki, Helsinki, Finland
- Children’s Hospital, Helsinki University Hospital, Helsinki, Finland
- Pediatrics, Department of Clinical Sciences Lund, Lund University, Lund, Sweden
| | - Jukka Kallijärvi
- Folkhälsan Research Center, Helsinki, Finland
- Stem Cells and Metabolism Research Program, Faculty of Medicine, University of Helsinki, Helsinki, Finland
| | - Janne Purhonen
- Folkhälsan Research Center, Helsinki, Finland
- Stem Cells and Metabolism Research Program, Faculty of Medicine, University of Helsinki, Helsinki, Finland
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Sečnik A, Štajner N, Radišek S, Kunej U, Križman M, Jakše J. Cytosine Methylation in Genomic DNA and Characterization of DNA Methylases and Demethylases and Their Expression Profiles in Viroid-Infected Hop Plants ( Humulus lupulus Var. 'Celeia'). Cells 2022; 11:cells11162592. [PMID: 36010668 PMCID: PMC9406385 DOI: 10.3390/cells11162592] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2022] [Revised: 08/08/2022] [Accepted: 08/16/2022] [Indexed: 11/16/2022] Open
Abstract
Abiotic and biotic stresses can lead to changes in host DNA methylation, which in plants is also mediated by an RNA-directed DNA methylation mechanism. Infections with viroids have been shown to affect DNA methylation dynamics in different plant hosts. The aim of our research was to determine the content of 5-methylcytosine (5-mC) in genomic DNA at the whole genome level of hop plants (Humulus lupulus Var. 'Celeia') infected with different viroids and their combinations and to analyse the expression of the selected genes to improve our understanding of DNA methylation dynamics in plant-viroid systems. The adapted HPLC-UV method used proved to be suitable for this purpose, and thus we were able to estimate for the first time that the cytosine methylation level in viroid-free hop plants was 26.7%. Interestingly, the observed 5-mC level was the lowest in hop plants infected simultaneously with CBCVd, HLVd and HSVd (23.7%), whereas the highest level was observed in plants infected with HLVd (31.4%). In addition, we identified three DNA methylases and one DNA demethylase gene in the hop's draft genome. The RT-qPCR revealed upregulation of all newly identified genes in hop plants infected with all three viroids, while no altered expression was observed in any of the other hop plants tested, except for CBCVd-infected hop plants, in which one DNA methylase was also upregulated.
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Affiliation(s)
- Andrej Sečnik
- Department of Agronomy, Biotechnical Faculty, University of Ljubljana, 1000 Ljubljana, Slovenia
| | - Nataša Štajner
- Department of Agronomy, Biotechnical Faculty, University of Ljubljana, 1000 Ljubljana, Slovenia
| | - Sebastjan Radišek
- Plant Protection Department, Slovenian Institute of Hop Research and Brewing, 3310 Žalec, Slovenia
| | - Urban Kunej
- Department of Agronomy, Biotechnical Faculty, University of Ljubljana, 1000 Ljubljana, Slovenia
| | - Mitja Križman
- Laboratory for Food Chemistry, National Institute of Chemistry, Hajdrihova 19, 1000 Ljubljana, Slovenia
| | - Jernej Jakše
- Department of Agronomy, Biotechnical Faculty, University of Ljubljana, 1000 Ljubljana, Slovenia
- Correspondence: ; Tel.: +386-1-3203280
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Wang X, Luo X. Precursor Quantitation Methods for Next Generation Food Production. Front Bioeng Biotechnol 2022; 10:849177. [PMID: 35360389 PMCID: PMC8960114 DOI: 10.3389/fbioe.2022.849177] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2022] [Accepted: 02/22/2022] [Indexed: 11/21/2022] Open
Abstract
Food is essential for human survival. Nowadays, traditional agriculture faces challenges in balancing the need of sustainable environmental development and the rising food demand caused by an increasing population. In addition, in the emerging of consumers' awareness of health related issues bring a growing trend towards novel nature-based food additives. Synthetic biology, using engineered microbial cell factories for production of various molecules, shows great advantages for generating food alternatives and additives, which not only relieve the pressure laid on tradition agriculture, but also create a new stage in healthy and sustainable food supplement. The biosynthesis of food components (protein, fats, carbohydrates or vitamins) in engineered microbial cells often involves cellular central metabolic pathways, where common precursors are processed into different proteins and products. Quantitation of the precursors provides information of the metabolic flux and intracellular metabolic state, giving guidance for precise pathway engineering. In this review, we summarized the quantitation methods for most cellular biosynthetic precursors, including energy molecules and co-factors involved in redox-reactions. It will also be useful for studies worked on pathway engineering of other microbial-derived metabolites. Finally, advantages and limitations of each method are discussed.
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Affiliation(s)
- Xinran Wang
- CAS Key Laboratory of Quantitative Engineering Biology, Shenzhen Institute of Synthetic Biology, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China
| | - Xiaozhou Luo
- CAS Key Laboratory of Quantitative Engineering Biology, Shenzhen Institute of Synthetic Biology, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China
- Shenzhen Institute of Advanced Technology, Shenzhen, China
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5
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Pastor-Belda M, Fernández-Caballero I, Campillo N, Arroyo-Manzanares N, Hernández-Córdoba M, Viñas P. Hydrophilic interaction liquid chromatography coupled to quadrupole-time-of-flight mass spectrometry for determination of nuclear and cytoplasmatic contents of nucleotides, nucleosides and their nucleobases in food yeasts. TALANTA OPEN 2021. [DOI: 10.1016/j.talo.2021.100064] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
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6
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Strezsak SR, Beuning PJ, Skizim NJ. Versatile separation of nucleotides from bacterial cell lysates using strong anion exchange chromatography. J Chromatogr B Analyt Technol Biomed Life Sci 2021; 1188:123044. [PMID: 34864423 DOI: 10.1016/j.jchromb.2021.123044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Revised: 11/08/2021] [Accepted: 11/11/2021] [Indexed: 10/19/2022]
Abstract
Nucleotides exemplify some of the building blocks of life, comprising DNA & RNA, participating in processes such as cell signaling and metabolism, and serving as carriers of metabolic energy. The quantification of these compounds in biological samples is critical for researchers to understand complex systems. Herein, we demonstrate an anion exchange chromatography method utilizing a pH range of 8 to 10, which provides superior resolution and selectivity to previously reported methods and, more importantly, gives the flexibility to shift analyte selectivity if resolution between analytes is not optimal. We have applied the method to study the kinetics of the nucleotide pool in a bacterial cell-free lysate system that is producing RNA. Sample to sample runtimes are less than 18 min and recoveries greater than 96% were observed for all analytes through our methanol quench protocol with day-to-day variabilities less than 5%. This method reliably detects and quantifies all analytes that were expected to be observed in the process and helps lay the groundwork for future nucleotide research.
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Affiliation(s)
- Steven R Strezsak
- Department of Chemistry & Chemical Biology, Northeastern University, Boston, MA 02115, United States; Greenlight Biosciences, Medford, MA, 02155, United States
| | - Penny J Beuning
- Department of Chemistry & Chemical Biology, Northeastern University, Boston, MA 02115, United States
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7
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Brain glycogen serves as a critical glucosamine cache required for protein glycosylation. Cell Metab 2021; 33:1404-1417.e9. [PMID: 34043942 PMCID: PMC8266748 DOI: 10.1016/j.cmet.2021.05.003] [Citation(s) in RCA: 45] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/11/2020] [Revised: 03/02/2021] [Accepted: 05/03/2021] [Indexed: 02/08/2023]
Abstract
Glycosylation defects are a hallmark of many nervous system diseases. However, the molecular and metabolic basis for this pathology is not fully understood. In this study, we found that N-linked protein glycosylation in the brain is metabolically channeled to glucosamine metabolism through glycogenolysis. We discovered that glucosamine is an abundant constituent of brain glycogen, which functions as a glucosamine reservoir for multiple glycoconjugates. We demonstrated the enzymatic incorporation of glucosamine into glycogen by glycogen synthase, and the release by glycogen phosphorylase by biochemical and structural methodologies, in primary astrocytes, and in vivo by isotopic tracing and mass spectrometry. Using two mouse models of glycogen storage diseases, we showed that disruption of brain glycogen metabolism causes global decreases in free pools of UDP-N-acetylglucosamine and N-linked protein glycosylation. These findings revealed fundamental biological roles of brain glycogen in protein glycosylation with direct relevance to multiple human diseases of the central nervous system.
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8
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Villacrés C, Tayi VS, Butler M. Strategic feeding of NS0 and CHO cell cultures to control glycan profiles and immunogenic epitopes of monoclonal antibodies. J Biotechnol 2021; 333:49-62. [PMID: 33901620 DOI: 10.1016/j.jbiotec.2021.04.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2020] [Revised: 04/03/2021] [Accepted: 04/18/2021] [Indexed: 01/12/2023]
Abstract
The control of glycosylation profiles is essential to the consistent manufacture of therapeutic monoclonal antibodies that may be produced from a variety of cell lines including CHO and NS0. Of particular concern is the potential for generating non-human epitopes such as N-glycolylneuraminic acid (Neu5Gc) and Galα1-3 Gal that may be immunogenic. We have looked at the effects of a commonly used media supplements of manganese, galactose and uridine (MGU) on Mab production from CHO and NS0 cells in enhancing galactosylation and sialylation as well as the generation of these non-human glycan epitopes. In the absence of the MGU supplement, the humanized IgG1 antibody (Hu1D10) produced from NS0 cells showed a low level of mono- and di-sialylated structures (SI:0.09) of which 75 % of sialic acid was Neu5Gc. The chimeric human-llama Mab (EG2-hFc) produced from CHO cells showed an equally low level of sialylation (SI: 0.12) but the Neu5Gc content of sialic acid was negligible (<3%). Combinations of the MGU supplements added to the production cultures resulted in a substantial increase in the galactosylation of both Mabs (up to GI:0.78 in Hu1D10 and 0.81 in EG2-hFc). However, the effects on sialylation differed between the two Mabs. We observed a slight increase in sialylation of the EG2-hFc Mab by a combination of MG but it appeared that one of the components (uridine) was inhibitory to sialylation. On the other hand, MG or MGU increased sialylation of Hu1D10 substantially (SI:0.72) with an increase that could be attributed predominantly to the formation of Neu5Ac rather than Neu5Gc. The increased level of galactosylation observed with MG or MGU was attributed to an activation of the galactosyl transferase enzymes through enhanced intracellular levels of UDP-Gal and the availability of Mn2+ as an enzymic co-factor. However, this effect not only increased the desirable beta 1-4 Gal linkage to GlcNAc but unfortunately in NS0 cells increased the formation of Galα1-3 Gal which was shown to increase x3 in the presence of combinations of the MGU supplements. Supplementation of media with fetal bovine serum (FBS) increased the availability of free Neu5Ac which resulted in a significant increase in the sialylation of Hu1D10 from NS0 cells. This also resulted in a significant decrease in the proportion of Neu5Gc in the measured sialic acid from the Mab.
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Affiliation(s)
- Carina Villacrés
- Department of Microbiology, University of Manitoba, Winnipeg, MB, R3T2N2, Canada
| | - Venkata S Tayi
- Department of Microbiology, University of Manitoba, Winnipeg, MB, R3T2N2, Canada
| | - Michael Butler
- Department of Microbiology, University of Manitoba, Winnipeg, MB, R3T2N2, Canada; National Institute for Bioprocessing Research & Training (NIBRT), Fosters Avenue, Dublin, A94 X099, Ireland.
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9
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Huang YF, Aoki K, Akase S, Ishihara M, Liu YS, Yang G, Kizuka Y, Mizumoto S, Tiemeyer M, Gao XD, Aoki-Kinoshita KF, Fujita M. Global mapping of glycosylation pathways in human-derived cells. Dev Cell 2021; 56:1195-1209.e7. [PMID: 33730547 PMCID: PMC8086148 DOI: 10.1016/j.devcel.2021.02.023] [Citation(s) in RCA: 48] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2020] [Revised: 12/15/2020] [Accepted: 02/12/2021] [Indexed: 01/02/2023]
Abstract
Glycans are one of the fundamental classes of macromolecules and are involved in a broad range of biological phenomena. A large variety of glycan structures can be synthesized depending on tissue or cell types and environmental changes. Here, we developed a comprehensive glycosylation mapping tool, termed GlycoMaple, to visualize and estimate glycan structures based on gene expression. We informatically selected 950 genes involved in glycosylation and its regulation. Expression profiles of these genes were mapped onto global glycan metabolic pathways to predict glycan structures, which were confirmed using glycomic analyses. Based on the predictions of N-glycan processing, we constructed 40 knockout HEK293 cell lines and analyzed the effects of gene knockout on glycan structures. Finally, the glycan structures of 64 cell lines, 37 tissues, and primary colon tumor tissues were estimated and compared using publicly available databases. Our systematic approach can accelerate glycan analyses and engineering in mammalian cells.
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Affiliation(s)
- Yi-Fan Huang
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, Jiangsu 214122, China
| | - Kazuhiro Aoki
- Complex Carbohydrate Research Center, University of Georgia, Athens, GA 30602, USA
| | - Sachiko Akase
- Graduate School of Engineering, Soka University, Hachioji, Tokyo 192-8577, Japan
| | - Mayumi Ishihara
- Complex Carbohydrate Research Center, University of Georgia, Athens, GA 30602, USA
| | - Yi-Shi Liu
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, Jiangsu 214122, China
| | - Ganglong Yang
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, Jiangsu 214122, China
| | - Yasuhiko Kizuka
- Center for Highly Advanced Integration of Nano and Life Sciences (G-CHAIN), Gifu University, Gifu 501-1193, Japan; Institute for Glyco-core Research (iGCORE), Gifu University, Gifu 501-1193, Japan
| | - Shuji Mizumoto
- Department of Pathobiochemistry, Faculty of Pharmacy, Meijo University, Nagoya, Aichi 468-8503, Japan
| | - Michael Tiemeyer
- Complex Carbohydrate Research Center, University of Georgia, Athens, GA 30602, USA
| | - Xiao-Dong Gao
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, Jiangsu 214122, China
| | - Kiyoko F Aoki-Kinoshita
- Graduate School of Engineering, Soka University, Hachioji, Tokyo 192-8577, Japan; Glycan & Life System Integration Center (GaLSIC), Faculty of Science and Engineering, Soka University, Hachioji, Tokyo 192-8577, Japan.
| | - Morihisa Fujita
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, Jiangsu 214122, China.
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Bombyx mori β1,4-N-acetylgalactosaminyltransferase possesses relaxed donor substrate specificity in N-glycan synthesis. Sci Rep 2021; 11:5505. [PMID: 33750826 PMCID: PMC7943597 DOI: 10.1038/s41598-021-84771-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Accepted: 02/08/2021] [Indexed: 12/15/2022] Open
Abstract
N-Glycosylation is one of the most important post-translational protein modifications in eukaryotic cells. Although more than 200 N-glycogenes contributing to N-glycan biosynthesis have been identified and characterized, the information on insect N-glycosylation is still limited. Here, focusing on insect N-glycosylation, we characterized Bombyx mori N-acetylgalactosaminyltransferase (BmGalNAcT) participating in complex N-glycan biosynthesis in mammals. BmGalNAcT localized at the Golgi and was ubiquitously expressed in every organ and in the developmental stage of the middle silk gland of fifth instar larvae. Analysis of recombinant BmGalNAcT expressed in Sf9 cells showed that BmGalNAcT transferred GalNAc to non-reducing terminals of GlcNAcβ1,2-R with β1,4-linkage. In addition, BmGalNAcT mediated transfer of galactose and N-acetylglucosamine residues but not transfer of either glucose or glucuronic acid from the UDP-sugar donor substrate to the N-glycan. Despite this tri-functional sugar transfer activity, however, most of the endogenous glycoproteins of insect cells were present without GalNAc, Gal, or GlcNAc residues at the non-reducing terminal of β1,2-GlcNAc residue(s). Moreover, overexpression of BmGalNAcT in insect cells had no effect on N-acetylgalactosaminylation, galactosylation, or N-acetylglucosaminylation of the major N-glycan during biosynthesis. These results suggested that B. mori has a novel multifunctional glycosyltransferase, but the N-glycosylation is highly and strictly regulated by the endogenous N-glycosylation machineries.
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11
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Ma J, Wu C, Hart GW. Analytical and Biochemical Perspectives of Protein O-GlcNAcylation. Chem Rev 2021; 121:1513-1581. [DOI: 10.1021/acs.chemrev.0c00884] [Citation(s) in RCA: 43] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Junfeng Ma
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University Medical Center, Georgetown University, Washington D.C. 20057, United States
| | - Ci Wu
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University Medical Center, Georgetown University, Washington D.C. 20057, United States
| | - Gerald W. Hart
- Department of Biochemistry and Molecular Biology, Complex Carbohydrate Research Center, University of Georgia, Athens, Georgia 30602, United States
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12
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Caon I, Parnigoni A, Viola M, Karousou E, Passi A, Vigetti D. Cell Energy Metabolism and Hyaluronan Synthesis. J Histochem Cytochem 2021; 69:35-47. [PMID: 32623953 PMCID: PMC7780193 DOI: 10.1369/0022155420929772] [Citation(s) in RCA: 51] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2020] [Accepted: 05/01/2020] [Indexed: 02/06/2023] Open
Abstract
Hyaluronan (HA) is a linear glycosaminoglycan (GAG) of extracellular matrix (ECM) synthesized by three hyaluronan synthases (HASes) at the plasma membrane using uridine diphosphate (UDP)-glucuronic acid (UDP-GlcUA) and UDP-N-acetylglucosamine (UDP-GlcNAc) as substrates. The production of HA is mainly regulated by hyaluronan synthase 2 (HAS2), that can be controlled at different levels, from epigenetics to transcriptional and post-translational modifications. HA biosynthesis is an energy-consuming process and, along with HA catabolism, is strongly connected to the maintenance of metabolic homeostasis. The cytoplasmic pool of UDP-sugars is critical for HA synthesis. UDP-GlcNAc is an important nutrient sensor and serves as donor substrate for the O-GlcNAcylation of many cytosolic proteins, including HAS2. This post-translational modification stabilizes HAS2 in the membrane and increases HA production. Conversely, HAS2 can be phosphorylated by AMP activated protein kinase (AMPK), a master metabolic regulator activated by low ATP/AMP ratios, which inhibits HA secretion. Similarly, HAS2 expression and the deposition of HA within the pericellular coat are inhibited by sirtuin 1 (SIRT1), another important energetic sensor, confirming the tight connection between nutrients availability and HA metabolism.
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Affiliation(s)
- Ilaria Caon
- Department of Medicine and Surgery, University of Insubria, Varese, Italy
| | - Arianna Parnigoni
- Department of Medicine and Surgery, University of Insubria, Varese, Italy
| | - Manuela Viola
- Department of Medicine and Surgery, University of Insubria, Varese, Italy
| | - Evgenia Karousou
- Department of Medicine and Surgery, University of Insubria, Varese, Italy
| | - Alberto Passi
- Department of Medicine and Surgery, University of Insubria, Varese, Italy
| | - Davide Vigetti
- Department of Medicine and Surgery, University of Insubria, Varese, Italy
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13
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Dai K, Peng X, Zhuang W, Yang P, Jiao P, Wu J, Ying H. Mass transfer process and separation mechanism of four 5'-ribonucleotides on a strong acid cation exchange resin. J Chromatogr A 2020; 1634:461681. [PMID: 33212368 DOI: 10.1016/j.chroma.2020.461681] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Revised: 10/13/2020] [Accepted: 10/30/2020] [Indexed: 10/23/2022]
Abstract
5'-ribonucleotides including adenosine 5'-monophosphate (AMP), cytidine 5'-monophsphate (CMP), guanosine 5'-monophosphate (GMP) and uridine 5'-monophosphate (UMP) have been widely used in the food and pharmaceutical industries. This work focused on the assessment of mass transfer process and separation mechanism of four 5'-ribonucleotides and counter-ion Na+ on the strong cation exchange resin NH-1. The intraparticle diffusion was determined as the rate-limiting step for the mass transfer of AMP, CMP, GMP, and Na+ on the resin NH-1 through the Boyd model. Meanwhile, a homogeneous surface diffusion model (HSDM) combing ion exchange and physical adsorption was proposed and tested against adsorption kinetic data in the batch adsorption systems. The fixed-bed film-surface diffusion model based on the HSDM was then developed and successfully predicted the concentration profiles of 5'-ribonucleotides and the change of pH at the outlet of the fixed-bed in the dynamic adsorption and separation process. Finally, the separation mechanism of 5'-ribonucleotides was presented combining model prediction and experimental results. The separation of UMP, GMP and CMP were mainly based on their differences in isoelectric points, while that of AMP and CMP were lied with the discrepancy of their physical adsorption binding capacity with the resin NH-1.
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Affiliation(s)
- Kun Dai
- College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, National Engineering Technique Research Center for Biotechnology and Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing, China
| | - Xiaoqiang Peng
- College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, National Engineering Technique Research Center for Biotechnology and Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing, China
| | - Wei Zhuang
- College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, National Engineering Technique Research Center for Biotechnology and Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing, China
| | - Pengpeng Yang
- College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, National Engineering Technique Research Center for Biotechnology and Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing, China
| | - Pengfei Jiao
- School of Life Science and Technology, Nanyang Normal University, Nanyang, China.
| | - Jinglan Wu
- College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, National Engineering Technique Research Center for Biotechnology and Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing, China.
| | - Hanjie Ying
- College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, National Engineering Technique Research Center for Biotechnology and Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing, China; State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing, China.
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14
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Wang Q, Wang T, Yang S, Sha S, Wu WW, Chen Y, Paul JT, Shen RF, Cipollo JF, Betenbaugh MJ. Metabolic engineering challenges of extending N-glycan pathways in Chinese hamster ovary cells. Metab Eng 2020; 61:301-314. [PMID: 32663509 DOI: 10.1016/j.ymben.2020.06.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Revised: 05/28/2020] [Accepted: 06/11/2020] [Indexed: 12/22/2022]
Abstract
In mammalian cells, N-glycans may include multiple N-acetyllactosamine (poly-LacNAc) units that can play roles in various cellular functions and properties of therapeutic recombinant proteins. Previous studies indicated that β-1,3-N-acetylglucosaminyltransferase 2 (B3GNT2) and β-1,4-galactotransferase 1 (B4GALT1) are two of the primary glycosyltransferases involved in generating LacNAc units. In the current study, knocking out sialyltransferase genes slightly enhanced the LacNAc content (≥4 repeats per glycan) on recombinant EPO protein. Next, the role of single and dual-overexpression of B3GNT2 and B4GALT1 was explored in recombinant EPO-expressing Chinese hamster ovary (CHO) cells. While overexpression of B4GALT1 slightly enhanced the levels of large glycans on recombinant EPO, overexpression of B3GNT2 in EPO-expressing CHO cells significantly decreased the recombinant EPO LacNAc content, resulting in N-glycans terminating primarily with GlcNAc structures, a limited number of Gals, and nearly undetectable sialylation, which was also observed in sialyltransferases knock-out-B3GNT2 overexpression cell lines. Considering the nature of the binding domain motifs present on B3GNT2, which evolved from β1,3-galactosyltransferases, its overexpression may have competed and inhibited endogenous β1,4-galactosyltransferases for exposed GlcNAc residues on the N-glycans, resulting in premature termination of many N-glycans at GlcNAc. Furthermore, B3GNT2 overexpression enhanced intracellular UDP-GlcNAc and CMP-Neu5Ac content while slightly lowering UDP-Gal content. The presence of a sink for UDP-GlcNAc in the form of B3GNT2 with no disposition may have also elevated the intracellular levels of this nucleotide as well as its downstream product, CMP-Neu5Ac. Furthermore, we were unable to overexpress B4GALT1 at either the transcriptional or translational levels following initial B3GNT2 expression. Expression of B3GNT2 following initial expression of B4GALT1 was also problematic in that transcriptional and translational analysis indicated the accumulation of truncated B3GNT2 missing a section of the B3GNT2 trans-Golgi lumen domain while transmembrane and cytoplasmic domains were present. Given that glycosylation is a very complex intra-network process, the addition of one or more recombinant glycosyltransferases may have an unexpected influence on the expression and activities of glycosyltransferases, which can disrupt the nucleotide sugar levels and lead to unexpected modifications of the resulting N-glycan patterns.
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Affiliation(s)
- Qiong Wang
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, MD, USA
| | - Tiexin Wang
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, MD, USA
| | - Shuang Yang
- Laboratory for Bacterial Polysaccharides, Division of Bacterial, Parasitic and Allergenic Products (DBPAP), Center for Biologics Evaluation and Research, US Food and Drug Administration, Silver Spring, MD, USA
| | - Sha Sha
- Center for Biomedical Innovation, Massachusetts Institute of Technology (MIT), Cambridge, MA, 02139, USA
| | - Wells W Wu
- Facility for Biotechnology Resources, Center for Biologics Evaluation and Research, Food and Drug Administration, Silver Spring, MD, 20993, USA
| | - Yiqun Chen
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, MD, USA
| | - Jackson T Paul
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, MD, USA
| | - Rong-Fong Shen
- Facility for Biotechnology Resources, Center for Biologics Evaluation and Research, Food and Drug Administration, Silver Spring, MD, 20993, USA
| | - John F Cipollo
- Laboratory for Bacterial Polysaccharides, Division of Bacterial, Parasitic and Allergenic Products (DBPAP), Center for Biologics Evaluation and Research, US Food and Drug Administration, Silver Spring, MD, USA
| | - Michael J Betenbaugh
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, MD, USA.
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15
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Majewska NI, Tejada ML, Betenbaugh MJ, Agarwal N. N-Glycosylation of IgG and IgG-Like Recombinant Therapeutic Proteins: Why Is It Important and How Can We Control It? Annu Rev Chem Biomol Eng 2020; 11:311-338. [DOI: 10.1146/annurev-chembioeng-102419-010001] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Regulatory bodies worldwide consider N-glycosylation to be a critical quality attribute for immunoglobulin G (IgG) and IgG-like therapeutics. This consideration is due to the importance of posttranslational modifications in determining the efficacy, safety, and pharmacokinetic properties of biologics. Given its critical role in protein therapeutic production, we review N-glycosylation beginning with an overview of the myriad interactions of N-glycans with other biological factors. We examine the mechanism and drivers for N-glycosylation during biotherapeutic production and the several competing factors that impact glycan formation, including the abundance of precursor nucleotide sugars, transporters, glycosidases, glycosyltransferases, and process conditions. We explore the role of these factors with a focus on the analytical approaches used to characterize glycosylation and associated processes, followed by the current state of advanced glycosylation modeling techniques. This combination of disciplines allows for a deeper understanding of N-glycosylation and will lead to more rational glycan control.
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Affiliation(s)
- Natalia I. Majewska
- Department of Chemical and Biomolecular Engineering, Whiting School of Engineering, Johns Hopkins University, Baltimore, Maryland 21218, USA;,
- Cell Culture and Fermentation Sciences, AstraZeneca, Gaithersburg, Maryland 20878, USA
| | - Max L. Tejada
- Bioassay, Impurities and Quality, AstraZeneca, Gaithersburg, Maryland 20878, USA
| | - Michael J. Betenbaugh
- Department of Chemical and Biomolecular Engineering, Whiting School of Engineering, Johns Hopkins University, Baltimore, Maryland 21218, USA;,
| | - Nitin Agarwal
- Cell Culture and Fermentation Sciences, AstraZeneca, Gaithersburg, Maryland 20878, USA
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16
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Xu Z, Ku X, Tomioka A, Xie W, Liang T, Zou X, Cui Y, Sato T, Kaji H, Narimatsu H, Yan W, Zhang Y. O-linked N-acetylgalactosamine modification is present on the tumor suppressor p53. Biochim Biophys Acta Gen Subj 2020; 1864:129635. [PMID: 32417172 DOI: 10.1016/j.bbagen.2020.129635] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2020] [Revised: 05/08/2020] [Accepted: 05/12/2020] [Indexed: 12/13/2022]
Abstract
BACKGROUND Mucin-type O-glycosylation (referred to as O-GalNAc glycosylation) is the most abundant O-glycosylation on membrane and secretory proteins. Recently several evidences suggest that nuclear or cytoplasmic proteins might also have O-GalNAc glycosylation. However, what nucleocytoplasmic proteins are O-GalNAc glycosylated and what the biological function of this modification in cells are still poorly understood. Previously, we reported the tumor suppressor p53 could be O-GalNAc glycosylated in vitro. To investigate the existence and function of O-GalNAc glycosylation on nucleocytoplasmic proteins in cell, p53 as a representative nucleocytoplasmic protein was studied. METHODS Using lectin blotting with GalNAc specific lectins, enzymatic treatments with O-GlcNAcase, core 1 β1, 3-galactosyltransferase and O-glycosidase, and metabolic labeling with un-O-acetylated GalNAz in UDP-Gal/UDP-GalNAc 4-epimerase (GALE) knockout cells, we validated the O-GalNAc glycosylation on p53. Using mass spectrometry analysis and site-directed mutagenesis, we identified the glycosylated sites and studied the functions of O-GalNAc glycosylation on p53. RESULTS The p53 was O-GalNAc glycosylated in cells. Ser121 residue was one of the glycosylated sites on p53. The O-GalNAc glycosylation at Ser121 was associated with the stability and activity of p53. CONCLUSIONS These results revealed that the O-GalNAc glycosylation was a novel modification on p53. GENERAL SIGNIFICANCE Our study provided a pilot evidence that the O-GalNAc glycosylation existed on nucleocytoplasmic protein.
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Affiliation(s)
- Zhijue Xu
- Key Laboratory of Systems Biomedicine (Ministry of Education) and Collaborative Innovation Center of Systems Biomedicine, Shanghai Center for Systems Biomedicine, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Xin Ku
- Key Laboratory of Systems Biomedicine (Ministry of Education) and Collaborative Innovation Center of Systems Biomedicine, Shanghai Center for Systems Biomedicine, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Azusa Tomioka
- Biotechnology Research Institute for Drug Discovery, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8568, Japan
| | - Wenxian Xie
- Key Laboratory of Systems Biomedicine (Ministry of Education) and Collaborative Innovation Center of Systems Biomedicine, Shanghai Center for Systems Biomedicine, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Tao Liang
- Key Laboratory of Systems Biomedicine (Ministry of Education) and Collaborative Innovation Center of Systems Biomedicine, Shanghai Center for Systems Biomedicine, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Xia Zou
- Key Laboratory of Systems Biomedicine (Ministry of Education) and Collaborative Innovation Center of Systems Biomedicine, Shanghai Center for Systems Biomedicine, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Yalu Cui
- Key Laboratory of Systems Biomedicine (Ministry of Education) and Collaborative Innovation Center of Systems Biomedicine, Shanghai Center for Systems Biomedicine, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Takashi Sato
- Biotechnology Research Institute for Drug Discovery, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8568, Japan
| | - Hiroyuki Kaji
- Biotechnology Research Institute for Drug Discovery, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8568, Japan
| | - Hisashi Narimatsu
- Biotechnology Research Institute for Drug Discovery, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8568, Japan; SCSB (China)-AIST (Japan) Joint Medical Glycomics Laboratory, Shanghai, China
| | - Wei Yan
- Key Laboratory of Systems Biomedicine (Ministry of Education) and Collaborative Innovation Center of Systems Biomedicine, Shanghai Center for Systems Biomedicine, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Yan Zhang
- Key Laboratory of Systems Biomedicine (Ministry of Education) and Collaborative Innovation Center of Systems Biomedicine, Shanghai Center for Systems Biomedicine, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China; SCSB (China)-AIST (Japan) Joint Medical Glycomics Laboratory, Shanghai, China.
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17
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Del Solar V, Gupta R, Zhou Y, Pawlowski G, Matta KL, Neelamegham S. Robustness in glycosylation systems: effect of modified monosaccharides, acceptor decoys and azido sugars on cellular nucleotide-sugar levels and pattern of N-linked glycosylation. Mol Omics 2020; 16:377-386. [PMID: 32352119 DOI: 10.1039/d0mo00023j] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Small molecule monosaccharide analogs (e.g. 4F-GlcNAc, 4F-GalNAc) and acceptor decoys (e.g. ONAP, SNAP) are commonly used as metabolic glycoengineering tools to perturb molecular and cellular recognition processes. Azido-derivatized sugars (e.g. ManNAz, GlcNAz, GalNAz) are also used as bioorthogonal probes to assay the glycosylation status of cells and tissue. With the goal of obtaining a systems-level understanding of how these compounds work, we cultured cells with these molecules and systematically evaluated their impact on: (i) cellular nucleotide-sugar levels, and (ii) N-linked glycosylation. To this end, we developed a streamlined, simple workflow to quantify nucleotide-sugar levels using amide-based hydrophilic interaction liquid chromatography (HILIC) separation followed by negative-mode electrospray ionization mass spectrometry (ESI-MS/MS) using an Orbitrap detector. N-Glycans released from cells were also procainamide functionalized and quantified using positive-mode ESI-MS/MS. Results show that all tested compounds changed the baseline nucleotide-sugar levels, with the effect being most pronounced for the fluoro-HexNAc compounds. These molecules depressed UDP-HexNAc levels in cells by up to 80%, while concomitantly elevating UDP-4F-GalNAc and UDP-4F-GlcNAc. While the measured changes in nucleotide-sugar concentration were substantial in many cases, their impact on N-linked glycosylation was relatively small. This may be due to the high nucleotide-sugar concentrations in the Golgi, which far exceed the KM values of the glycosylating enzymes. Thus, the glycosylation system output exhibits 'robustness' even in the face of significant changes in cellular nucleotide-sugar concentrations.
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Affiliation(s)
- Virginia Del Solar
- Department of Chemical & Biological Engineering, Biomedical Engineering and Medicine, University at Buffalo, State University of New York, Buffalo, NY 14260, USA.
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18
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Raimi OG, Hurtado-Guerrero R, Borodkin V, Ferenbach A, Urbaniak MD, Ferguson MAJ, van Aalten DMF. A mechanism-inspired UDP- N-acetylglucosamine pyrophosphorylase inhibitor. RSC Chem Biol 2020; 1:13-25. [PMID: 34458745 PMCID: PMC8386105 DOI: 10.1039/c9cb00017h] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2019] [Accepted: 02/13/2020] [Indexed: 11/21/2022] Open
Abstract
UDP-N-acetylglucosamine pyrophosphorylase (UAP1) catalyses the last step in eukaryotic biosynthesis of uridine diphosphate-N-acetylglucosamine (UDP-GlcNAc), converting UTP and GlcNAc-1P to the sugar nucleotide. Gene disruption studies have shown that this gene is essential in eukaryotes and a possible antifungal target, yet no inhibitors of fungal UAP1 have so far been reported. Here we describe the crystal structures of substrate/product complexes of UAP1 from Aspergillus fumigatus that together provide snapshots of catalysis. A structure with UDP-GlcNAc, pyrophosphate and Mg2+ provides the first Michaelis complex trapped for this class of enzyme, revealing the structural basis of the previously reported Mg2+ dependence and direct observation of pyrophosphorolysis. We also show that a highly conserved lysine mimics the role of a second metal observed in structures of bacterial orthologues. A mechanism-inspired UTP α,β-methylenebisphosphonate analogue (meUTP) was designed and synthesized and was shown to be a micromolar inhibitor of the enzyme. The mechanistic insights and inhibitor described here will facilitate future studies towards the discovery of small molecule inhibitors of this currently unexploited potential antifungal drug target. UDP-N-acetylglucosamine pyrophosphorylase (UAP1) catalyses the last step in eukaryotic biosynthesis of uridine diphosphate-N-acetylglucosamine (UDP-GlcNAc), converting UTP and GlcNAc-1P to the sugar nucleotide.![]()
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Affiliation(s)
- Olawale G Raimi
- Division of Gene Regulation and Expression, School of Life Sciences, University of Dundee Dow Street DD1 5EH Dundee UK
| | - Ramon Hurtado-Guerrero
- Division of Gene Regulation and Expression, School of Life Sciences, University of Dundee Dow Street DD1 5EH Dundee UK
| | - Vladimir Borodkin
- Division of Gene Regulation and Expression, School of Life Sciences, University of Dundee Dow Street DD1 5EH Dundee UK
| | - Andrew Ferenbach
- Division of Gene Regulation and Expression, School of Life Sciences, University of Dundee Dow Street DD1 5EH Dundee UK
| | - Michael D Urbaniak
- Wellcome Centre for Anti-Infectives Research, School of Life Sciences, University of Dundee Dow Street DD1 5EH Dundee UK
| | - Michael A J Ferguson
- Wellcome Centre for Anti-Infectives Research, School of Life Sciences, University of Dundee Dow Street DD1 5EH Dundee UK
| | - Daan M F van Aalten
- Division of Gene Regulation and Expression, School of Life Sciences, University of Dundee Dow Street DD1 5EH Dundee UK
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19
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Crippen CS, Lee YJ, Hutinet G, Shajahan A, Sacher JC, Azadi P, de Crécy-Lagard V, Weigele PR, Szymanski CM. Deoxyinosine and 7-Deaza-2-Deoxyguanosine as Carriers of Genetic Information in the DNA of Campylobacter Viruses. J Virol 2019; 93:e01111-19. [PMID: 31511377 PMCID: PMC6854489 DOI: 10.1128/jvi.01111-19] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2019] [Accepted: 09/03/2019] [Indexed: 12/31/2022] Open
Abstract
Several reports have demonstrated that Campylobacter bacteriophage DNA is refractory to manipulation, suggesting that these phages encode modified DNA. The characterized Campylobacter jejuni phages fall into two phylogenetic groups within the Myoviridae: the genera Firehammervirus and Fletchervirus Analysis of genomic nucleosides from several of these phages by high-pressure liquid chromatography-mass spectrometry confirmed that 100% of the 2'-deoxyguanosine (dG) residues are replaced by modified bases. Fletcherviruses replace dG with 2'-deoxyinosine, while the firehammerviruses replace dG with 2'-deoxy-7-amido-7-deazaguanosine (dADG), noncanonical nucleotides previously described, but a 100% base substitution has never been observed to have been made in a virus. We analyzed the genome sequences of all available phages representing both groups to elucidate the biosynthetic pathway of these noncanonical bases. Putative ADG biosynthetic genes are encoded by the Firehammervirus phages and functionally complement mutants in the Escherichia coli queuosine pathway, of which ADG is an intermediate. To investigate the mechanism of DNA modification, we isolated nucleotide pools and identified dITP after phage infection, suggesting that this modification is made before nucleotides are incorporated into the phage genome. However, we were unable to observe any form of dADG phosphate, implying a novel mechanism of ADG incorporation into an existing DNA strand. Our results imply that Fletchervirus and Firehammervirus phages have evolved distinct mechanisms to express dG-free DNA.IMPORTANCE Bacteriophages are in a constant evolutionary struggle to overcome their microbial hosts' defenses and must adapt in unconventional ways to remain viable as infectious agents. One mode of adaptation is modifying the viral genome to contain noncanonical nucleotides. Genome modification in phages is becoming more commonly reported as analytical techniques improve, but guanosine modifications have been underreported. To date, two genomic guanosine modifications have been observed in phage genomes, and both are low in genomic abundance. The significance of our research is in the identification of two novel DNA modification systems in Campylobacter-infecting phages, which replace all guanosine bases in the genome in a genus-specific manner.
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Affiliation(s)
- Clay S Crippen
- Department of Microbiology, University of Georgia, Athens, Georgia, USA
- Complex Carbohydrate Research Center, University of Georgia, Athens, Georgia, USA
| | - Yan-Jiun Lee
- Research Department, New England Biolabs, Ipswich, Massachusetts, USA
| | - Geoffrey Hutinet
- Department of Microbiology and Cell Sciences, University of Florida, Gainesville, Florida, USA
| | - Asif Shajahan
- Complex Carbohydrate Research Center, University of Georgia, Athens, Georgia, USA
| | - Jessica C Sacher
- Department of Biological Sciences, University of Alberta, Edmonton, Alberta, Canada
| | - Parastoo Azadi
- Complex Carbohydrate Research Center, University of Georgia, Athens, Georgia, USA
| | - Valérie de Crécy-Lagard
- Department of Microbiology and Cell Sciences, University of Florida, Gainesville, Florida, USA
| | - Peter R Weigele
- Research Department, New England Biolabs, Ipswich, Massachusetts, USA
| | - Christine M Szymanski
- Department of Microbiology, University of Georgia, Athens, Georgia, USA
- Complex Carbohydrate Research Center, University of Georgia, Athens, Georgia, USA
- Department of Biological Sciences, University of Alberta, Edmonton, Alberta, Canada
- Department of Medical Microbiology and Immunology, University of Alberta, Edmonton, Alberta, Canada
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20
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Wang J, Li W, Xiao J, Ni B, Li J, Wu J, Zhang Q. Hydroxyapatite-embedded monolithic column for selective on-line solid-phase extraction of adenosine triphosphate and its phosphorylated metabolites. J Chromatogr B Analyt Technol Biomed Life Sci 2019; 1128:121769. [PMID: 31476577 DOI: 10.1016/j.jchromb.2019.121769] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2019] [Revised: 07/19/2019] [Accepted: 08/18/2019] [Indexed: 01/03/2023]
Abstract
A novel hydroxyapatite-embedded monolithic column has been facilely prepared in a stainless-steel column with inner diameter of 2.1 mm by the strong adhesion of urea-formaldehyde (UF) resin and exploited as a sorbent for selective on-line solid-phase extraction (on-line SPE) of adenosine triphosphate and its phosphorylated metabolites. The composition for this preparation, including the amount of hydroxyapatite nanopowders and the porogen were investigated to obtain a suitable monolith with large surface area and satisfactory permeability. Owing to anion exchange interaction of hydroxyapatite and hydrophilic interaction of UF monolithic matrix, the prepared monolith showed good extraction efficiency and selectivity towards these phosphorylated analytes. Several parameters for on-line SPE, including ACN percentage in the sampling solution, collection time span, salt concentration of the eluent, sampling and elution flow rate, were optimized with respect to the extraction efficiencies of the target compounds. Under the optimized conditions, the LODs of the analytes were in the range of 0.01-0.04 μg/g, the recoveries in the spiked samples ranged from 78.3%-92.5% with RSDs <4.7%. Due to the excellent extraction ability towards phosphorylated compounds in practical samples, a simple on-line SPE-HPLC method using hydroxyapatite-embedded monolith as sorbent has been proposed for monitoring freshness of grass carp.
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Affiliation(s)
- Jiabin Wang
- Institute of Biomedical and Pharmaceutical Technology, Fuzhou University, Fuzhou 350002, China.
| | - Wenbang Li
- Institute of Biomedical and Pharmaceutical Technology, Fuzhou University, Fuzhou 350002, China
| | - Jianhua Xiao
- Institute of Biomedical and Pharmaceutical Technology, Fuzhou University, Fuzhou 350002, China
| | - Bichen Ni
- Institute of Biomedical and Pharmaceutical Technology, Fuzhou University, Fuzhou 350002, China
| | - Jianhua Li
- Institute of Biomedical and Pharmaceutical Technology, Fuzhou University, Fuzhou 350002, China
| | - Jiulin Wu
- Institute of Biomedical and Pharmaceutical Technology, Fuzhou University, Fuzhou 350002, China
| | - Qiqing Zhang
- Institute of Biomedical and Pharmaceutical Technology, Fuzhou University, Fuzhou 350002, China
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21
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Akhova AV, Tkachenko AG. HPLC–UV method for simultaneous determination of adenosine triphosphate and its metabolites inMycobacterium smegmatis. ACTA CHROMATOGR 2019. [DOI: 10.1556/1326.2017.00344] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Affiliation(s)
- Anna V. Akhova
- Institute of Ecology and Genetics of Microorganisms, Russian Academy of Sciences, 13, Golev str., Perm 614081, Russia
- Perm National Research Polytechnic University, 29, Komsomolsky Ave., Perm 614990, Russia
| | - Alexander G. Tkachenko
- Institute of Ecology and Genetics of Microorganisms, Russian Academy of Sciences, 13, Golev str., Perm 614081, Russia
- Perm State National Research University, 15, Bukirev str., Perm 614068, Russia
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22
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Abstract
UDP-sugars are important substrates for the synthesis of various cellular glycans and glycoconjugates, many of which play essential roles in the pathobiology of diseases associated with deranged glucose metabolism, such as cancer and type 2 diabetes. Hence, their analysis from cultured cells and especially from tissue samples can give valuable information. This chapter describes a method for UDP-sugar isolation from various sources utilizing ion-pair solid-phase extraction with graphitized carbon cartridges, and their analysis using anion-exchange high-performance liquid chromatography.
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Affiliation(s)
- Sanna Oikari
- Institute of Biomedicine, University of Eastern Finland, Kuopio, Finland.
- Institute of Dentistry, University of Eastern Finland, Kuopio, Finland.
| | - Markku I Tammi
- Institute of Biomedicine, University of Eastern Finland, Kuopio, Finland
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23
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Naik HM, Majewska NI, Betenbaugh MJ. Impact of nucleotide sugar metabolism on protein N-glycosylation in Chinese Hamster Ovary (CHO) cell culture. Curr Opin Chem Eng 2018. [DOI: 10.1016/j.coche.2018.10.002] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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24
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Ghosh S. Sialylation and sialyltransferase in insects. Glycoconj J 2018; 35:433-441. [PMID: 30058043 DOI: 10.1007/s10719-018-9835-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2018] [Revised: 07/06/2018] [Accepted: 07/09/2018] [Indexed: 12/20/2022]
Abstract
Sialic acids are negatively charged nine carbon monosaccharides located terminally on glycoproteins and glycolipids that control cellular physiological processes. Sialylation is a post translational modification (ptm) regulated by enzymes and has been studied in prokaryotes including bacteria, dueterostomes including vertebrates, Cephalochordates, Ascidians, Echinoderms and protostomes including Molluscs and Arthropods and Plant. Although diverse structures of sialylated molecules have been reported in different organisms, unravelling sialylation in insect biology is a completely new domain. Within protostomes, the study of sialylation in members of Phylum Arthropoda and Class Insecta finds importance. Reports on sialylation in some insects exist. Genetically engineered components of sialylation pathway in Spodoptera frugiperda (Sf9) cell lines have enabled our understanding of sialylation and expression of mammalian proteins in insects. In this study we have summarised the finding on (i) sialylated molecules (ii) processes and enzymes involved (iii) function of sialylation (iv) genetic engineering approaches and generation of mammalian protein expression systems (v) a comparison of sialylation machinery in insects with that of mammals (vi) genes and transcriptional regulation in insects. At present no information on structural studies of insect sialyltransferase (STs) exist. We report minor differences in ST structure in insects on complete protein sequences recorded in Genbank through in silico approaches. An indepth study of all the components of the sialylation pathway in different insect species across different families and their evolutionary significance finds importance as the future scope of this review.
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Affiliation(s)
- Shyamasree Ghosh
- School of Biological Sciences, National Institute of Science Education and Research (NISER), Bhubaneswar, Odisha, 752050, India. .,Homi Bhabha National Institute, Training School Complex, Anushakti Nagar, Mumbai, 400094, India.
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25
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Qin X, Wang X. Quantification of nucleotides and their sugar conjugates in biological samples: Purposes, instruments and applications. J Pharm Biomed Anal 2018; 158:280-287. [PMID: 29902692 DOI: 10.1016/j.jpba.2018.06.013] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2018] [Revised: 06/06/2018] [Accepted: 06/07/2018] [Indexed: 01/23/2023]
Abstract
Nucleotides and their sugar conjugates are fundamental molecules in life, participating in processes of DNA/RNA composition, cell wall build-up, glycosylation reactions, and signal conduction. Therefore, the quantification of these compounds in biological samples significantly benefits the understanding of their functions. However, nucleotides and nucleotide sugars are extremely hydrophilic, causing bad retention and peak symmetry on regular C18 chromatographic columns. To solve this problem, ion-pair (IP) chromatography, ion-exchange (IE) chromatography and hydrophilic interaction chromatography (HILIC) were applied, of which differentiated mechanisms were utilized to increase the retention of the analytes on the stationary phases. IP-HPLC and HILIC were convenient for coupling with many kinds of detectors (ultraviolet, UV or mass spectrometry, MS). Combining these two kinds of techniques, the advantages of better separation and retention were increased, while disadvantages like irreversible adsorption by stationary phases were greatly decreased. Due to the high concentrations of nonvolatile buffer salts used, IE-HPLC was not suitable for MS detectors. Protein precipitation and solid phase extraction were the common methods for sample treatment in the analysis of nucleotides and nucleotide sugars. By carefully optimizing the LCUV or LCMS conditions, high sensitivities could be achieved, and the methods could be applied to the analysis of many kinds of biological samples (cells, tissues, plants, bacteria, etc.). Developing new analyzing techniques may help the utilization of nucleotides and nucleotide sugars in the diagnosis and therapy of diseases.
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Affiliation(s)
- Xuan Qin
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences and School of Life Sciences, East China Normal University, Shanghai, China
| | - Xin Wang
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences and School of Life Sciences, East China Normal University, Shanghai, China.
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26
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Yamasaki Y, Tsuda L, Suzuki A, Yanagisawa K. Induction of ganglioside synthesis in Drosophila brain accelerates assembly of amyloid β protein. Sci Rep 2018; 8:8345. [PMID: 29844375 PMCID: PMC5974419 DOI: 10.1038/s41598-018-26294-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Accepted: 04/25/2018] [Indexed: 11/09/2022] Open
Abstract
The assembly and deposition of amyloid β protein (Aβ) is a fundamental event during the early stages of Alzheimer's disease (AD) and cerebral amyloid angiopathy. A growing body of evidence indicates that gangliosides form a pathological platform for the generation of ganglioside-bound Aβ, which facilitates the assembly of soluble Aβs; however, the molecular mechanisms underlying the binding of Aβ to gangliosides in the brain remain unclear due to the lack of an in vivo system that may address this issue. In insects, including the fruit fly Drosophila melanogaster, gangliosides are not intrinsically present at a detectable level. We herein demonstrate that ganglioside expression is inducible in Drosophila via the expression of transgenes of ganglioside synthesis enzymes and the feeding of exogenous sialic acid, and also that the induction of ganglioside synthesis significantly accelerates Aβ assembly in vivo. Our results support the hypothesis that gangliosides are responsible for Aβ assembly in vivo and also provide an opportunity to develop a valuable model for basic research as well as a therapeutic strategy for AD.
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Affiliation(s)
- Yasutoyo Yamasaki
- Laboratory of Animal Models of Aging, Center for Development of Advanced Medicine for Dementia, National Center for Geriatrics and Gerontology, Morioka 7-430, Obu, Aichi, 474-8511, Japan
| | - Leo Tsuda
- Laboratory of Animal Models of Aging, Center for Development of Advanced Medicine for Dementia, National Center for Geriatrics and Gerontology, Morioka 7-430, Obu, Aichi, 474-8511, Japan.
| | - Akemi Suzuki
- Institute of Glycoscience, Tokai University, 4-1-1 Kitakaname, Hiratsuka, Kanagawa, 259-1292, Japan.,Institute of Molecular Biomembrane and Glycobiology, Tohoku Medical and Pharmaceutical University, 84-4-1 Komatsushima, Aobaku, Sendai, Miyagi, 981-8558, Japan
| | - Katsuhiko Yanagisawa
- Center for Development of Advanced Medicine for Dementia, National Center for Geriatrics and Gerontology, Morioka 7-430, Obu, Aichi, 474-8511, Japan
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27
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Increased O-GlcNAcylation of SNAP29 Drives Arsenic-Induced Autophagic Dysfunction. Mol Cell Biol 2018; 38:MCB.00595-17. [PMID: 29507186 PMCID: PMC5954189 DOI: 10.1128/mcb.00595-17] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2017] [Accepted: 02/26/2018] [Indexed: 12/17/2022] Open
Abstract
Environmental exposure to arsenic is linked to adverse health effects, including cancer and diabetes. Pleiotropic cellular effects are observed with arsenic exposure. Previously, we demonstrated that arsenic dysregulated the autophagy pathway at low, environmentally relevant concentrations. Here we show that arsenic blocks autophagy by preventing autophagosome-lysosome fusion. Specifically, arsenic disrupts formation of the STX17-SNAP29-VAMP8 SNARE complex, where SNAP29 mediates vesicle fusion through bridging STX17-containing autophagosomes to VAMP8-bearing lysosomes. Mechanistically, arsenic inhibits SNARE complex formation, at least in part, by enhancing O-GlcNAcylation of SNAP29. Transfection of O-GlcNAcylation-defective, but not wild-type, SNAP29 into clustered regularly interspaced short palindromic repeat (CRISPR)-mediated SNAP29 knockout cells abolishes arsenic-mediated autophagy inhibition. These findings reveal a mechanism by which low levels of arsenic perturb proteostasis through inhibition of SNARE complex formation, providing a possible therapeutic target for disease intervention in the more than 200 million people exposed to unsafe levels of arsenic.
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28
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Lee CG, Oh MJ, Park SY, An HJ, Kim JH. Inhibition of poly-LacNAc biosynthesis with release of CMP-Neu5Ac feedback inhibition increases the sialylation of recombinant EPO produced in CHO cells. Sci Rep 2018; 8:7273. [PMID: 29740059 PMCID: PMC5940879 DOI: 10.1038/s41598-018-25580-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2017] [Accepted: 04/23/2018] [Indexed: 12/25/2022] Open
Abstract
Sialylation of recombinant therapeutic glycoproteins modulates their pharmacokinetic properties by affecting their in vivo half-life. N-glycan branching on glycoproteins increases the number of potential attachment sites for sialic acid. Here, we introduce a new approach for increasing the sialylation of recombinant human erythropoietin (rhEPO) produced in CHO cells by modulating poly-N-acetyllactosamine (poly-LacNAc) biosynthesis. We did not observe an increase in rhEPO sialylation, however, until the feedback inhibition by intracellular cytidine monophosphate-N-acetylneuraminic acid (CMP-Neu5Ac), which is a limiting factor for sialylation, was released. Thus, we found that a combined approach inhibiting poly-LacNAc biosynthesis and releasing CMP-Neu5Ac feedback inhibition produces the most significant increase in rhEPO sialylation in metabolically engineered CHO cells. Furthermore, a detailed analysis of the resulting N-glycan structures using LC/MS revealed increased tri- and tetra- sialylated N-glycan structures accompanied by a reduction of di-sialylated N-glycan structures. These results validate our new approach for glycosylation engineering, and we expect this approach will be useful in future efforts to enhance the efficacy of other therapeutic glycoproteins.
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Affiliation(s)
- Chung-Geun Lee
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea
| | - Myung Jin Oh
- Graduate School of Analytical Science & Technology, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon, 34134, Republic of Korea.,Asia-pacific Glycomics Reference Site, Daejeon, 34134, Republic of Korea
| | - Seung-Yeol Park
- Division of Rheumatology, Immunology and Allergy, Brigham and Women's Hospital, and Department of Medicine, Harvard Medical School, Boston, MA, 02115, USA
| | - Hyun Joo An
- Graduate School of Analytical Science & Technology, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon, 34134, Republic of Korea.,Asia-pacific Glycomics Reference Site, Daejeon, 34134, Republic of Korea
| | - Jung Hoe Kim
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea.
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29
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Owings KG, Lowry JB, Bi Y, Might M, Chow CY. Transcriptome and functional analysis in a Drosophila model of NGLY1 deficiency provides insight into therapeutic approaches. Hum Mol Genet 2018; 27:1055-1066. [PMID: 29346549 PMCID: PMC5886220 DOI: 10.1093/hmg/ddy026] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2017] [Revised: 01/05/2018] [Accepted: 01/09/2018] [Indexed: 12/21/2022] Open
Abstract
Autosomal recessive loss-of-function mutations in N-glycanase 1 (NGLY1) cause NGLY1 deficiency, the only known human disease of deglycosylation. Patients present with developmental delay, movement disorder, seizures, liver dysfunction and alacrima. NGLY1 is a conserved cytoplasmic component of the Endoplasmic Reticulum Associated Degradation (ERAD) pathway. ERAD clears misfolded proteins from the ER lumen. However, it is unclear how loss of NGLY1 function impacts ERAD and other cellular processes and results in the constellation of problems associated with NGLY1 deficiency. To understand how loss of NGLY1 contributes to disease, we developed a Drosophila model of NGLY1 deficiency. Loss of NGLY1 function resulted in developmental delay and lethality. We used RNAseq to determine which processes are misregulated in the absence of NGLY1. Transcriptome analysis showed no evidence of ER stress upon NGLY1 knockdown. However, loss of NGLY1 resulted in a strong signature of NRF1 dysfunction among downregulated genes, as evidenced by an enrichment of genes encoding proteasome components and proteins involved in oxidation-reduction. A number of transcriptome changes also suggested potential therapeutic interventions, including dysregulation of GlcNAc synthesis and upregulation of the heat shock response. We show that increasing the function of both pathways rescues lethality. Together, transcriptome analysis in a Drosophila model of NGLY1 deficiency provides insight into potential therapeutic approaches.
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Affiliation(s)
- Katie G Owings
- Department of Human Genetics, University of Utah School of Medicine, Salt Lake City, UT 84112, USA
| | - Joshua B Lowry
- Department of Human Genetics, University of Utah School of Medicine, Salt Lake City, UT 84112, USA
| | - Yiling Bi
- Department of Medicinal Chemistry, University of Utah College of Pharmacy, Salt Lake City, UT 84112, USA
| | - Matthew Might
- Department of Pharmaceutics & Pharmaceutical Chemistry, University of Utah College of Pharmacy, Salt Lake City, UT 84112, USA
- School of Computing, University of Utah, Salt Lake City, UT 84112, USA
| | - Clement Y Chow
- Department of Human Genetics, University of Utah School of Medicine, Salt Lake City, UT 84112, USA
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30
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Palomares LA, Srivastava IK, Ramírez OT, Cox MMJ. Glycobiotechnology of the Insect Cell-Baculovirus Expression System Technology. ADVANCES IN GLYCOBIOTECHNOLOGY 2018; 175:71-92. [DOI: 10.1007/10_2018_61] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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31
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Kelly RM, Kowle RL, Lian Z, Strifler BA, Witcher DR, Parekh BS, Wang T, Frye CC. Modulation of IgG1 immunoeffector function by glycoengineering of the GDP-fucose biosynthesis pathway. Biotechnol Bioeng 2017; 115:705-718. [PMID: 29150961 DOI: 10.1002/bit.26496] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2017] [Revised: 11/01/2017] [Accepted: 11/14/2017] [Indexed: 12/13/2022]
Abstract
Cross-linking of the Fcγ receptors expressed on the surface of hematopoietic cells by IgG immune complexes triggers the activation of key immune effector mechanisms, including antibody-dependent cell mediated cytotoxicity (ADCC). A conserved N-glycan positioned at the N-terminal region of the IgG CH 2 domain is critical in maintaining the quaternary structure of the molecule for Fcγ receptor engagement. The removal of a single core fucose residue from the N-glycan results in a considerable increase in affinity for FcγRIIIa leading to an enhanced receptor-mediated immunoeffector function. The enhanced potency of the molecule translates into a number of distinct advantages in the development of IgG antibodies for cancer therapy. In an effort to significantly increase the potency of an anti-CD20, IgG1 molecule, we selectively targeted the de novo GDP-fucose biosynthesis pathway of the host CHO cell line to generate >80% afucosylated IgG1 resulting in enhanced FcγRIIIa binding (13-fold) and in vitro ADCC cell-based activity (11-fold). In addition, this effective glycoengineering strategy also allowed for the utilization of the alternate GDP-fucose salvage pathway to provide a fast and efficient mechanism to manipulate the N-glycan fucosylation level to modulate IgG immune effector function.
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Affiliation(s)
- Ronan M Kelly
- Bioprocess Research and Development, Eli Lilly and Company, Indianapolis, Indiana
| | - Ronald L Kowle
- Bioprocess Research and Development, Eli Lilly and Company, Indianapolis, Indiana
| | - Zhirui Lian
- Bioprocess Research and Development, Eli Lilly and Company, Indianapolis, Indiana
| | - Beth A Strifler
- Biotechnology Discovery Research, Lilly Research Laboratories, Eli Lilly and Company, Lilly Corporate Center, Indianapolis, Indiana
| | - Derrick R Witcher
- Biotechnology Discovery Research, Lilly Research Laboratories, Eli Lilly and Company, Lilly Corporate Center, Indianapolis, Indiana
| | - Bhavin S Parekh
- Bioprocess Research and Development, Eli Lilly and Company, Indianapolis, Indiana
| | - Tongtong Wang
- Bioprocess Research and Development, Eli Lilly and Company, Indianapolis, Indiana
| | - Christopher C Frye
- Bioprocess Research and Development, Eli Lilly and Company, Indianapolis, Indiana
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32
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Kwak CY, Park SY, Lee CG, Okino N, Ito M, Kim JH. Enhancing the sialylation of recombinant EPO produced in CHO cells via the inhibition of glycosphingolipid biosynthesis. Sci Rep 2017; 7:13059. [PMID: 29026192 PMCID: PMC5638827 DOI: 10.1038/s41598-017-13609-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2017] [Accepted: 09/26/2017] [Indexed: 11/20/2022] Open
Abstract
Sialylation regulates the in vivo half-life of recombinant therapeutic glycoproteins, affecting their therapeutic efficacy. Levels of the precursor molecule cytidine monophospho-N-acetylneuraminic acid (CMP-Neu5Ac) are considered a limiting factor in the sialylation of glycoproteins. Here, we show that by reducing the amount of intracellular CMP-Neu5Ac consumed for glycosphingolipid (GSL) biosynthesis, we can increase the sialylation of recombinant human erythropoietin (rhEPO) produced in CHO cells. Initially, we found that treating CHO cells with a potent inhibitor of GSL biosynthesis increases the sialylation of the rhEPO they produce. Then, we established a stable CHO cell line that produces rhEPO in the context of repression of the key GSL biosynthetic enzyme UDP-glucose ceramide glucosyltransferase (UGCG). These UGCG-depleted cells show reduced levels of gangliosides and significantly elevated levels of rhEPO sialylation. Upon further analysis of the resulting N-glycosylation pattern, we discovered that the enhanced rhEPO sialylation could be attributed to a decrease in neutral and mono-sialylated N-glycans and an increase in di-sialylated N-glycans. Our results suggest that the therapeutic efficacy of rhEPO produced in CHO cells can be improved by shunting intracellular CMP-Neu5Ac away from GSL biosynthesis and toward glycoprotein sialylation.
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Affiliation(s)
- Chan-Yeong Kwak
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology, 335 Gwahangno, Yuseong-gu, Daejeon, 305-701, Republic of Korea
| | - Seung-Yeol Park
- Division of Rheumatology, Immunology and Allergy, Brigham and Women's Hospital, and Department of Medicine, Harvard Medical School, Boston, MA, 02115, USA.
| | - Chung-Geun Lee
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology, 335 Gwahangno, Yuseong-gu, Daejeon, 305-701, Republic of Korea
| | - Nozomu Okino
- Department of Bioscience and Biotechnology, Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, 6-10-1, Hakozaki, Higashi-ku, Fukuoka, 812-8581, Japan
| | - Makoto Ito
- Department of Bioscience and Biotechnology, Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, 6-10-1, Hakozaki, Higashi-ku, Fukuoka, 812-8581, Japan
| | - Jung Hoe Kim
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology, 335 Gwahangno, Yuseong-gu, Daejeon, 305-701, Republic of Korea.
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33
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Andres LM, Blong IW, Evans AC, Rumachik NG, Yamaguchi T, Pham ND, Thompson P, Kohler JJ, Bertozzi CR. Chemical Modulation of Protein O-GlcNAcylation via OGT Inhibition Promotes Human Neural Cell Differentiation. ACS Chem Biol 2017; 12:2030-2039. [PMID: 28541657 DOI: 10.1021/acschembio.7b00232] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The enzymes that determine protein O-GlcNAcylation, O-GlcNAc transferase (OGT) and O-GlcNAcase (OGA), act on key transcriptional and epigenetic regulators, and both are abundantly expressed in the brain. However, little is known about how alterations in O-GlcNAc cycling affect human embryonic stem cell (hESC) neural differentiation. Here, we studied the effects of perturbing O-GlcNAcylation during neural induction of hESCs using the metabolic inhibitor of OGT, peracetylated 5-thio-N-acetylglucosamine (Ac4-5SGlcNAc). Treatment of hESCs with Ac4-5SGlcNAc during induction limited protein O-GlcNAcylation and also caused a dramatic decrease in global levels of UDP-GlcNAc. Concomitantly, a subpopulation of neural progenitor cells (NPCs) acquired an immature neuronal morphology and expressed early neuronal markers such as β-III tubulin (TUJ1) and microtubule associated protein 2 (MAP2), phenotypes that took longer to manifest in the absence of OGT inhibition. These data suggest that chemical inhibition of OGT and perturbation of protein O-GlcNAcylation accelerate the differentiation of hESCs along the neuronal lineage, thus providing further insight into the dynamic molecular mechanisms involved in neuronal development.
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Affiliation(s)
- Lissette M. Andres
- Department
of Molecular and Cell Biology, University of California, Berkeley, California 94720, United States
| | - Ian W. Blong
- Department
of Stem Cell Biology and Regenerative Medicine, Stanford University, Stanford, California 94305, United States
| | - Angela C. Evans
- Department
of Chemistry, University of California, Berkeley, California 94720, United States
| | - Neil G. Rumachik
- Department
of Chemistry, Stanford University, Stanford, California 94305, United States
| | - Teppei Yamaguchi
- Department
of Molecular and Cell Biology, University of California, Berkeley, California 94720, United States
| | - Nam D. Pham
- Department
of Biochemistry, University of Texas Southwestern Medical Center, Dallas, Texas 75390, United States
| | - Pamela Thompson
- Department
of Chemistry, University of California, Berkeley, California 94720, United States
| | - Jennifer J. Kohler
- Department
of Biochemistry, University of Texas Southwestern Medical Center, Dallas, Texas 75390, United States
| | - Carolyn R. Bertozzi
- Department
of Chemistry, Stanford University, Stanford, California 94305, United States
- Howard Hughes Medical Institute, Chevy Chase, Maryland, United States
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34
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Pham ND, Pang PC, Krishnamurthy S, Wands AM, Grassi P, Dell A, Haslam SM, Kohler JJ. Effects of altered sialic acid biosynthesis on N-linked glycan branching and cell surface interactions. J Biol Chem 2017; 292:9637-9651. [PMID: 28424265 PMCID: PMC5465488 DOI: 10.1074/jbc.m116.764597] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2016] [Revised: 04/17/2017] [Indexed: 12/22/2022] Open
Abstract
GNE (UDP-GlcNAc 2-epimerase/ManNAc kinase) myopathy is a rare muscle disorder associated with aging and is related to sporadic inclusion body myositis, the most common acquired muscle disease of aging. Although the cause of sporadic inclusion body myositis is unknown, GNE myopathy is associated with mutations in GNE. GNE harbors two enzymatic activities required for biosynthesis of sialic acid in mammalian cells. Mutations to both GNE domains are linked to GNE myopathy. However, correlation between mutation-associated reductions in sialic acid production and disease severity is imperfect. To investigate other potential effects of GNE mutations, we compared sialic acid production in cell lines expressing wild type or mutant forms of GNE. Although we did not detect any differences attributable to disease-associated mutations, lectin binding and mass spectrometry analysis revealed that GNE deficiency is associated with unanticipated effects on the structure of cell-surface glycans. In addition to exhibiting low levels of sialylation, GNE-deficient cells produced distinct N-linked glycan structures with increased branching and extended poly-N-acetyllactosamine. GNE deficiency may affect levels of UDP-GlcNAc, a key metabolite in the nutrient-sensing hexosamine biosynthetic pathway, but this modest effect did not fully account for the change in N-linked glycan structure. Furthermore, GNE deficiency and glucose supplementation acted independently and additively to increase N-linked glycan branching. Notably, N-linked glycans produced by GNE-deficient cells displayed enhanced binding to galectin-1, indicating that changes in GNE activity can alter affinity of cell-surface glycoproteins for the galectin lattice. These findings suggest an unanticipated mechanism by which GNE activity might affect signaling through cell-surface receptors.
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Affiliation(s)
- Nam D Pham
- From the Department of Biochemistry, University of Texas Southwestern Medical Center, Dallas, Texas 75390-9038 and
| | - Poh-Choo Pang
- the Department of Life Sciences, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom
| | - Soumya Krishnamurthy
- From the Department of Biochemistry, University of Texas Southwestern Medical Center, Dallas, Texas 75390-9038 and
| | - Amberlyn M Wands
- From the Department of Biochemistry, University of Texas Southwestern Medical Center, Dallas, Texas 75390-9038 and
| | - Paola Grassi
- the Department of Life Sciences, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom
| | - Anne Dell
- the Department of Life Sciences, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom
| | - Stuart M Haslam
- the Department of Life Sciences, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom
| | - Jennifer J Kohler
- From the Department of Biochemistry, University of Texas Southwestern Medical Center, Dallas, Texas 75390-9038 and
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35
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Kane MS, Davids M, Bond MR, Adams CJ, Grout ME, Phelps IG, O'Day DR, Dempsey JC, Li X, Golas G, Vezina G, Gunay-Aygun M, Hanover JA, Doherty D, He M, Malicdan MCV, Gahl WA, Boerkoel CF. Abnormal glycosylation in Joubert syndrome type 10. Cilia 2017; 6:2. [PMID: 28344780 PMCID: PMC5364566 DOI: 10.1186/s13630-017-0048-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2016] [Accepted: 02/17/2017] [Indexed: 12/25/2022] Open
Abstract
BACKGROUND The discovery of disease pathogenesis requires systematic agnostic screening of multiple homeostatic processes that may become deregulated. We illustrate this principle in the evaluation and diagnosis of a 5-year-old boy with Joubert syndrome type 10 (JBTS10). He carried the OFD1 mutation p.Gln886Lysfs*2 (NM_003611.2: c.2656del) and manifested features of Joubert syndrome. METHODS We integrated exome sequencing, MALDI-TOF mass spectrometry analyses of plasma and cultured dermal fibroblasts glycomes, and full clinical evaluation of the proband. Analyses of cilia formation and lectin staining were performed by immunofluorescence. Measurement of cellular nucleotide sugar levels was performed with high-performance anion-exchange chromatography with pulsed amperometric detection. Statistical analyses utilized the Student's and Fisher's exact t tests. RESULTS Glycome analyses of plasma and cultured dermal fibroblasts identified abnormal N- and O-linked glycosylation profiles. These findings replicated in two unrelated males with OFD1 mutations. Cultured fibroblasts from affected individuals had a defect in ciliogenesis. The proband's fibroblasts also had an abnormally elevated nuclear sialylation signature and increased total cellular levels of CMP-sialic acid. Ciliogenesis and each glycosylation anomaly were rescued by expression of wild-type OFD1. CONCLUSIONS The rescue of ciliogenesis and glycosylation upon reintroduction of WT OFD1 suggests that both contribute to the pathogenesis of JBTS10.
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Affiliation(s)
- Megan S Kane
- NIH Undiagnosed Disease Program, Common Fund, Office of the Director, and National Human Genome Research Institute, National Institutes of Health, Bethesda, MD USA.,Inova Translational Medicine Institute, Inova Health System, Falls Church, VA USA
| | - Mariska Davids
- NIH Undiagnosed Disease Program, Common Fund, Office of the Director, and National Human Genome Research Institute, National Institutes of Health, Bethesda, MD USA
| | - Michelle R Bond
- National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD USA
| | - Christopher J Adams
- NIH Undiagnosed Disease Program, Common Fund, Office of the Director, and National Human Genome Research Institute, National Institutes of Health, Bethesda, MD USA
| | - Megan E Grout
- Department of Pediatrics, University of Washington, Seattle, WA USA
| | - Ian G Phelps
- Department of Pediatrics, University of Washington, Seattle, WA USA
| | - Diana R O'Day
- Department of Pediatrics, University of Washington, Seattle, WA USA
| | | | - Xeuli Li
- The Michael J Palmieri Metabolic Laboratory, Children's Hospital of Philadelphia, Philadelphia, PA USA
| | - Gretchen Golas
- NIH Undiagnosed Disease Program, Common Fund, Office of the Director, and National Human Genome Research Institute, National Institutes of Health, Bethesda, MD USA
| | | | - Meral Gunay-Aygun
- Medical Genetics Branch, National Human Genome Research Institute, National Institutes of Health, Bethesda, MD USA.,Office of the Clinical Director, National Human Genome Research Institute, National Institutes of Health, Bethesda, MD USA.,Johns Hopkins University School of Medicine, Department of Pediatrics and McKusick-Nathans Institute of Genetic Medicine, Baltimore, MD USA
| | - John A Hanover
- National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD USA
| | - Dan Doherty
- Department of Pediatrics, University of Washington, Seattle, WA USA
| | - Miao He
- The Michael J Palmieri Metabolic Laboratory, Children's Hospital of Philadelphia, Philadelphia, PA USA
| | - May Christine V Malicdan
- NIH Undiagnosed Disease Program, Common Fund, Office of the Director, and National Human Genome Research Institute, National Institutes of Health, Bethesda, MD USA
| | - William A Gahl
- NIH Undiagnosed Disease Program, Common Fund, Office of the Director, and National Human Genome Research Institute, National Institutes of Health, Bethesda, MD USA
| | - Cornelius F Boerkoel
- NIH Undiagnosed Disease Program, Common Fund, Office of the Director, and National Human Genome Research Institute, National Institutes of Health, Bethesda, MD USA.,Department of Medical Genetics, University of British Columbia, Vancouver, BC Canada
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A Plant Bacterial Pathogen Manipulates Its Insect Vector's Energy Metabolism. Appl Environ Microbiol 2017; 83:AEM.03005-16. [PMID: 28039132 DOI: 10.1128/aem.03005-16] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2016] [Accepted: 12/19/2016] [Indexed: 01/14/2023] Open
Abstract
Insect-transmitted plant-pathogenic bacteria may alter their vectors' fitness, survival, behavior, and metabolism. Because these pathogens interact with their vectors on the cellular and organismal levels, potential changes at the biochemical level might occur. "Candidatus Liberibacter asiaticus" (CLas) is transmitted in a persistent, circulative, and propagative manner. The genome of CLas revealed the presence of an ATP translocase that mediates the uptake of ATP and other nucleotides from medium to achieve its biological processes, such as growth and multiplication. Here, we showed that the levels of ATP and many other nucleotides were significantly higher in CLas-infected than healthy psyllids. Gene expression analysis showed upregulation for ATP synthase subunits, while ATPase enzyme activity showed a decrease in ATPase activity. These results indicated that CLas stimulated Diaphorina citri to produce more ATP and many other energetic nucleotides, while it may inhibit their consumption by the insect. As a result of ATP accumulation, the adenylated energy charge (AEC) increased and the AMP/ATP and ADP/ATP ratios decreased in CLas-infected D. citri psyllids. Survival analysis confirmed a shorter life span for CLas-infected D. citri psyllids. In addition, electropenetrography showed a significant reduction in total nonprobing time, salivation time, and time from the last E2 (phloem ingestion) to the end of recording, indicating that CLas-infected psyllids were at a higher hunger level and they tended to forage more often. This increased feeding activity reflects the CLas-induced energetic stress. In conclusion, CLas alters the energy metabolism of its psyllid vector, D. citri, in order to secure its need for energetic nucleotides.IMPORTANCE Insect transmission of plant-pathogenic bacteria involves propagation and circulation of the bacteria within their vectors. The transmission process is complex and requires specific interactions at the molecular and biochemical levels. The growth of the plant-pathogenic bacteria in the hemolymph of their vectors indicated that the hemolymph contains all the necessary nutrients for their growth. In addition to nutrients, "Candidatus Liberibacter asiaticus" (CLas) can take up energetic nucleotides, such as ATP, from its vector, Diaphorina citri, using ATP translocase. In this study, we found that the CLas pathogen manipulates the energy metabolism of its insect vector. The accumulation of ATP in CLas-infected D. citri psyllids indicated that CLas induces ATP production to fulfill its need for this energetic compound. As a result of ATP accumulation, a shorter life span and altered feeding behavior were observed. These findings increase our knowledge of insect transmission of the persistent-circulative-propagative type of plant pathogens vectored by insects.
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Abstract
Sugar nucleotides are essential building blocks for the glycobiology of all living organisms. Detailed information on the types of sugar nucleotides present in a particular cell and how they change as a function of metabolic, developmental, or disease status is vital. The extraction, identification, and quantification of sugar nucleotides in a given sample present formidable challenges. In this chapter, currently used techniques for sugar nucleotide extraction from cells, separation from complex biological matrices, and detection by optical and mass spectrometry methods are discussed.
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Leija C, Rijo-Ferreira F, Kinch LN, Grishin NV, Nischan N, Kohler JJ, Hu Z, Phillips MA. Pyrimidine Salvage Enzymes Are Essential for De Novo Biosynthesis of Deoxypyrimidine Nucleotides in Trypanosoma brucei. PLoS Pathog 2016; 12:e1006010. [PMID: 27820863 PMCID: PMC5098729 DOI: 10.1371/journal.ppat.1006010] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2016] [Accepted: 10/18/2016] [Indexed: 01/17/2023] Open
Abstract
The human pathogenic parasite Trypanosoma brucei possess both de novo and salvage routes for the biosynthesis of pyrimidine nucleotides. Consequently, they do not require salvageable pyrimidines for growth. Thymidine kinase (TK) catalyzes the formation of dTMP and dUMP and is one of several salvage enzymes that appear redundant to the de novo pathway. Surprisingly, we show through analysis of TK conditional null and RNAi cells that TK is essential for growth and for infectivity in a mouse model, and that a catalytically active enzyme is required for its function. Unlike humans, T. brucei and all other kinetoplastids lack dCMP deaminase (DCTD), which provides an alternative route to dUMP formation. Ectopic expression of human DCTD resulted in full rescue of the RNAi growth phenotype and allowed for selection of viable TK null cells. Metabolite profiling by LC-MS/MS revealed a buildup of deoxypyrimidine nucleosides in TK depleted cells. Knockout of cytidine deaminase (CDA), which converts deoxycytidine to deoxyuridine led to thymidine/deoxyuridine auxotrophy. These unexpected results suggested that T. brucei encodes an unidentified 5'-nucleotidase that converts deoxypyrimidine nucleotides to their corresponding nucleosides, leading to their dead-end buildup in TK depleted cells at the expense of dTTP pools. Bioinformatics analysis identified several potential candidate genes that could encode 5'-nucleotidase activity including an HD-domain protein that we show catalyzes dephosphorylation of deoxyribonucleotide 5'-monophosphates. We conclude that TK is essential for synthesis of thymine nucleotides regardless of whether the nucleoside precursors originate from the de novo pathway or through salvage. Reliance on TK in the absence of DCTD may be a shared vulnerability among trypanosomatids and may provide a unique opportunity to selectively target a diverse group of pathogenic single-celled eukaryotes with a single drug.
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Affiliation(s)
- Christopher Leija
- Department of Pharmacology University of Texas Southwestern Medical Center at Dallas, Dallas, Texas, United States of America
| | - Filipa Rijo-Ferreira
- Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, Lisboa, Portugal
- Department of Neuroscience, University of Texas Southwestern Medical Center at Dallas, Dallas, Texas, United States of America
- Graduate Program in Areas of Basic and Applied Biology, Instituto de Ciências Biomédicas Abel Salazar, Universidade do Porto, Porto, Portugal
| | - Lisa N. Kinch
- Department of Biophysics, University of Texas Southwestern Medical Center at Dallas, Dallas, Texas, United States of America
| | - Nick V. Grishin
- Department of Biophysics, University of Texas Southwestern Medical Center at Dallas, Dallas, Texas, United States of America
| | - Nicole Nischan
- Department of Biochemistry, University of Texas Southwestern Medical Center at Dallas, Dallas, Texas, United States of America
| | - Jennifer J. Kohler
- Department of Biochemistry, University of Texas Southwestern Medical Center at Dallas, Dallas, Texas, United States of America
| | - Zeping Hu
- Children’s Medical Center Research Institute, University of Texas Southwestern Medical Center at Dallas, Dallas, Texas, United States of America
| | - Margaret A. Phillips
- Department of Pharmacology University of Texas Southwestern Medical Center at Dallas, Dallas, Texas, United States of America
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Villiger TK, Scibona E, Stettler M, Broly H, Morbidelli M, Soos M. Controlling the time evolution of mAb N-linked glycosylation - Part II: Model-based predictions. Biotechnol Prog 2016; 32:1135-1148. [PMID: 27273889 DOI: 10.1002/btpr.2315] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2015] [Revised: 03/24/2016] [Indexed: 01/04/2023]
Abstract
N-linked glycosylation is known to be a crucial factor for the therapeutic efficacy and safety of monoclonal antibodies (mAbs) and many other glycoproteins. The nontemplate process of glycosylation is influenced by external factors which have to be tightly controlled during the manufacturing process. In order to describe and predict mAb N-linked glycosylation patterns in a CHO-S cell fed-batch process, an existing dynamic mathematical model has been refined and coupled to an unstructured metabolic model. High-throughput cell culture experiments carried out in miniaturized bioreactors in combination with intracellular measurements of nucleotide sugars were used to tune the parameter configuration of the coupled models as a function of extracellular pH, manganese and galactose addition. The proposed modeling framework is able to predict the time evolution of N-linked glycosylation patterns during a fed-batch process as a function of time as well as the manipulated variables. A constant and varying mAb N-linked glycosylation pattern throughout the culture were chosen to demonstrate the predictive capability of the modeling framework, which is able to quantify the interconnected influence of media components and cell culture conditions. Such a model-based evaluation of feeding regimes using high-throughput tools and mathematical models gives rise to a more rational way to control and design cell culture processes with defined glycosylation patterns. © 2016 American Institute of Chemical Engineers Biotechnol. Prog., 32:1135-1148, 2016.
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Affiliation(s)
- Thomas K Villiger
- Dept. of Chemistry and Applied Biosciences, Inst. for Chemical and Bioengineering, ETH Zurich, Zurich, Switzerland
| | - Ernesto Scibona
- Dept. of Chemistry and Applied Biosciences, Inst. for Chemical and Bioengineering, ETH Zurich, Zurich, Switzerland
| | - Matthieu Stettler
- Biotech Process Sciences, Merck-Serono S.A., Corsier-sur-Vevey, 1809, Switzerland
| | - Hervé Broly
- Biotech Process Sciences, Merck-Serono S.A., Corsier-sur-Vevey, 1809, Switzerland
| | - Massimo Morbidelli
- Dept. of Chemistry and Applied Biosciences, Inst. for Chemical and Bioengineering, ETH Zurich, Zurich, Switzerland
| | - Miroslav Soos
- Dept. of Chemical Engineering, University of Chemistry and Technology, Prague, Czech Republic.
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de Oliveira JD, Carvalho LS, Gomes AMV, Queiroz LR, Magalhães BS, Parachin NS. Genetic basis for hyper production of hyaluronic acid in natural and engineered microorganisms. Microb Cell Fact 2016; 15:119. [PMID: 27370777 PMCID: PMC4930576 DOI: 10.1186/s12934-016-0517-4] [Citation(s) in RCA: 67] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2016] [Accepted: 06/22/2016] [Indexed: 11/10/2022] Open
Abstract
Hyaluronic acid, or HA, is a rigid and linear biopolymer belonging to the class of the glycosaminoglycans, and composed of repeating units of the monosaccharides glucuronic acid and N-acetylglucosamine. HA has multiple important functions in the human body, due to its properties such as bio-compatibility, lubricity and hydrophilicity, it is widely applied in the biomedical, food, health and cosmetic fields. The growing interest in this molecule has motivated the discovery of new ways of obtaining it. Traditionally, HA has been extracted from rooster comb-like animal tissues. However, due to legislation laws HA is now being produced by bacterial fermentation using Streptococcus zooepidemicus, a natural producer of HA, despite it being a pathogenic microorganism. With the expansion of new genetic engineering technologies, the use of organisms that are non-natural producers of HA has also made it possible to obtain such a polymer. Most of the published reviews have focused on HA formulation and its effects on different body tissues, whereas very few of them describe the microbial basis of HA production. Therefore, for the first time this review has compiled the molecular and genetic bases for natural HA production in microorganisms together with the main strategies employed for heterologous production of HA.
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Affiliation(s)
- Juliana Davies de Oliveira
- Pós-Graduação em Ciências Genômicas e Biotecnologia, Universidade Católica de Brasília, Brasília, DF, CEP 70.790-160, Brazil
| | - Lucas Silva Carvalho
- Integra Bioprocessos e Análises, Campus Universitário Darcy Ribeiro, Edifício CDT, Sala AT-36/37, Brasília, DF, CEP 70.904-970, Brazil
| | - Antônio Milton Vieira Gomes
- Grupo de Engenharia Metabólica Aplicada a Bioprocessos, Instituto de Ciências Biológicas, Universidade de Brasília, Brasília, DF, CEP 70.790-900, Brazil
| | - Lúcio Rezende Queiroz
- Grupo de Engenharia Metabólica Aplicada a Bioprocessos, Instituto de Ciências Biológicas, Universidade de Brasília, Brasília, DF, CEP 70.790-900, Brazil
| | - Beatriz Simas Magalhães
- Pós-Graduação em Ciências Genômicas e Biotecnologia, Universidade Católica de Brasília, Brasília, DF, CEP 70.790-160, Brazil.,Integra Bioprocessos e Análises, Campus Universitário Darcy Ribeiro, Edifício CDT, Sala AT-36/37, Brasília, DF, CEP 70.904-970, Brazil
| | - Nádia Skorupa Parachin
- Grupo de Engenharia Metabólica Aplicada a Bioprocessos, Instituto de Ciências Biológicas, Universidade de Brasília, Brasília, DF, CEP 70.790-900, Brazil.
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Villiger TK, Roulet A, Périlleux A, Stettler M, Broly H, Morbidelli M, Soos M. Controlling the time evolution of mAb N-linked glycosylation, Part I: Microbioreactor experiments. Biotechnol Prog 2016; 32:1123-1134. [PMID: 27254475 DOI: 10.1002/btpr.2305] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2015] [Revised: 03/24/2016] [Indexed: 01/28/2023]
Abstract
N-linked glycosylation is of key importance for the efficacy of many biotherapeutic proteins such as monoclonal antibodies (mAbs). Media components and cell culture conditions have been shown to significantly affect N-linked glycosylation during the production of glycoproteins using mammalian cell fed-batch cultures. These parameters inevitably change in modern industrial processes with concentrated feed additions and cell densities beyond 2 × 107 cells/mL. In order to control the time-dependent changes of protein glycosylation, an automated microbioreactor system was used to investigate the effects of culture pH, ammonia, galactose, and manganese chloride supplementation on nucleotide sugars as well as mAb N-linked glycosylation in a time-dependent way. Two different strategies comprising of a single shift of culture conditions as well as multiple media supplementations along the culture duration were applied to obtain changing and constant glycosylation profiles. The different feeding approaches enabled constant glycosylation patterns throughout the entire culture duration at different levels. By modulating the time evolution of the mAb glycan pattern, not only the endpoint but also the ratios between different glycosylation structures could be modified. © 2016 American Institute of Chemical Engineers Biotechnol. Prog., 32:1123-1134, 2016.
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Affiliation(s)
- Thomas K Villiger
- Dept. of Chemistry and Applied Biosciences, Inst. for Chemical and Bioengineering, ETH Zurich, Zurich, Switzerland
| | - Anaïs Roulet
- Biotech Process Sciences, Merck-Serono S.A., Corsier-sur-Vevey, ZI B 1809, Switzerland
| | - Arnaud Périlleux
- Biotech Process Sciences, Merck-Serono S.A., Corsier-sur-Vevey, ZI B 1809, Switzerland
| | - Matthieu Stettler
- Biotech Process Sciences, Merck-Serono S.A., Corsier-sur-Vevey, ZI B 1809, Switzerland
| | - Hervé Broly
- Biotech Process Sciences, Merck-Serono S.A., Corsier-sur-Vevey, ZI B 1809, Switzerland
| | - Massimo Morbidelli
- Dept. of Chemistry and Applied Biosciences, Inst. for Chemical and Bioengineering, ETH Zurich, Zurich, Switzerland
| | - Miroslav Soos
- Dept. of Chemistry and Applied Biosciences, Inst. for Chemical and Bioengineering, ETH Zurich, Zurich, Switzerland. .,Dept. of Chemical Engineering, University of Chemistry and Technology, Prague, Czech Republic.
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Characterization of Drosophila CMP-sialic acid synthetase activity reveals unusual enzymatic properties. Biochem J 2016; 473:1905-16. [PMID: 27114558 DOI: 10.1042/bcj20160347] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2016] [Accepted: 04/25/2016] [Indexed: 12/24/2022]
Abstract
CMP-sialic acid synthetase (CSAS) is a key enzyme of the sialylation pathway. CSAS produces the activated sugar donor, CMP-sialic acid, which serves as a substrate for sialyltransferases to modify glycan termini with sialic acid. Unlike other animal CSASs that normally localize in the nucleus, Drosophila melanogaster CSAS (DmCSAS) localizes in the cell secretory compartment, predominantly in the Golgi, which suggests that this enzyme has properties distinct from those of its vertebrate counterparts. To test this hypothesis, we purified recombinant DmCSAS and characterized its activity in vitro Our experiments revealed several unique features of this enzyme. DmCSAS displays specificity for N-acetylneuraminic acid as a substrate, shows preference for lower pH and can function with a broad range of metal cofactors. When tested at a pH corresponding to the Golgi compartment, the enzyme showed significant activity with several metal cations, including Zn(2+), Fe(2+), Co(2+) and Mn(2+), whereas the activity with Mg(2+) was found to be low. Protein sequence analysis and site-specific mutagenesis identified an aspartic acid residue that is necessary for enzymatic activity and predicted to be involved in co-ordinating a metal cofactor. DmCSAS enzymatic activity was found to be essential in vivo for rescuing the phenotype of DmCSAS mutants. Finally, our experiments revealed a steep dependence of the enzymatic activity on temperature. Taken together, our results indicate that DmCSAS underwent evolutionary adaptation to pH and ionic environment different from that of counterpart synthetases in vertebrates. Our data also suggest that environmental temperatures can regulate Drosophila sialylation, thus modulating neural transmission.
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43
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Isolation and analysis of sugar nucleotides using solid phase extraction and fluorophore assisted carbohydrate electrophoresis. MethodsX 2016; 3:251-60. [PMID: 27222820 PMCID: PMC4821447 DOI: 10.1016/j.mex.2016.03.010] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2015] [Accepted: 03/11/2016] [Indexed: 11/23/2022] Open
Abstract
The building blocks of simple and complex oligosaccharides, termed sugar nucleotides, are often overlooked for their role in metabolic diseases and may hold the key to the underlying disease pathogenesis. Multiple reasons may account for the lack of analysis and quantitation of these sugar nucleotides, including the difficulty in isolation and purification as well as the required expensive instrumentation such as a high performance liquid chromatography (HPLC), mass spectrometer, or capillary electrophoresis. We have established a simple yet effective way to purify and quantitate sugar nucleotides using solid phase extraction (SPE) chromatography combined with fluorophore assisted carbohydrate electrophoresis (FACE). The simplicity of use, combined with the ability to run multiple samples at one time, give this technique a distinct advantage over the established methods for isolation and analysis of sugar nucleotides from cell culture models. Sugar nucleotides can be easily purified with solid phase extraction chromatography. FACE can be used to analyze multiple nucleotide sugar extracts with a single run. The proposed method is simple, affordable, and uses common everyday research labware.
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Key Words
- AMAC, 2-aminoacridone
- APS, ammonium persulfate
- CMP, cytosine monophosphate
- Carbohydrate
- Electrophoresis
- FACE, fluorophore assisted carbohydrate electrophoresis
- Face
- GDP, guanosine diphosphate
- Gal, galactose
- GalNAc, N-acetylgalactosamine
- GlcNAc, N-acetylglucosamine
- GlcUA, glucuronic acid
- HPLC
- HPLC, high performance liquid chromatography
- Man, Mannose
- NeuAc, sialic acid
- SPE, solid phase extraction
- Sugar nucleotide analysis by SPE and FACE
- Sugar nucleotides
- TEAA, triethylamine acetate
- TEMED, N′,N′,N′N′-tetramethylenediamine
- UDP, uridine diphosphate
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Evaluation of Quenching and Extraction Methods for Nucleotide/Nucleotide Sugar Analysis. Methods Mol Biol 2016; 1321:361-72. [PMID: 26082234 DOI: 10.1007/978-1-4939-2760-9_24] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Nucleotide sugars are the donor substrates of glycosyltransferases and their availability is known to have an impact on the glycosylation of recombinant proteins including monoclonal antibodies. In addition, the intracellular concentration levels of these metabolites can provide information about the physiological/energetic state of the cell. Therefore, the ability to qualitatively and quantitatively determine the intracellular nucleotides and nucleotide sugars can give valuable insight into the metabolism associated with the glycosylation processes in cells. However, in order to be able to perform a consistent and reliable time specific analysis of these metabolites during a cell culture the metabolism of the cell needs to be stopped immediately at the point of sampling and an efficient extraction needs to be performed. Once the nucleotides and nucleotide sugars are extracted from the cell sample an efficient HPLC method is needed to separate all or most of the metabolites of interest to allow for their identification and quantification. Here, we describe an optimized method for the analysis of the intracellular nucleotide/nucleotide sugar pool in CHO suspension cells which includes protocols for quenching, extraction and HPLC analysis.
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45
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Mo T, Liu X, Liu Y, Wang X, Zhang L, Wang J, Zhang Z, Shi S, Tu P. Expanded investigations of the aglycon promiscuity and catalysis characteristic of flavonol 3-O-rhamnosyltransferase AtUGT78D1 from Arabidopsis thaliana. RSC Adv 2016. [DOI: 10.1039/c6ra16251g] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Rhamnosides usually possess better bioavailabilities and improved solubilities compared with their aglycons and are a major source of bioactive natural products.
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Affiliation(s)
- Ting Mo
- Modern Research Center for Traditional Chinese Medicine
- Beijing University of Chinese Medicine
- Beijing 100029
- P. R. China
- School of Chinese Materia Medica
| | - Xiao Liu
- Modern Research Center for Traditional Chinese Medicine
- Beijing University of Chinese Medicine
- Beijing 100029
- P. R. China
| | - Yuyu Liu
- Modern Research Center for Traditional Chinese Medicine
- Beijing University of Chinese Medicine
- Beijing 100029
- P. R. China
- School of Chinese Materia Medica
| | - Xiaohui Wang
- Modern Research Center for Traditional Chinese Medicine
- Beijing University of Chinese Medicine
- Beijing 100029
- P. R. China
| | - Le Zhang
- Modern Research Center for Traditional Chinese Medicine
- Beijing University of Chinese Medicine
- Beijing 100029
- P. R. China
- School of Chinese Materia Medica
| | - Juan Wang
- Modern Research Center for Traditional Chinese Medicine
- Beijing University of Chinese Medicine
- Beijing 100029
- P. R. China
- School of Chinese Materia Medica
| | - Zhongxiu Zhang
- Modern Research Center for Traditional Chinese Medicine
- Beijing University of Chinese Medicine
- Beijing 100029
- P. R. China
- School of Chinese Materia Medica
| | - Shepo Shi
- Modern Research Center for Traditional Chinese Medicine
- Beijing University of Chinese Medicine
- Beijing 100029
- P. R. China
| | - Pengfei Tu
- Modern Research Center for Traditional Chinese Medicine
- Beijing University of Chinese Medicine
- Beijing 100029
- P. R. China
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Harrison RL, Jarvis DL. Transforming Lepidopteran Insect Cells for Improved Protein Processing and Expression. Methods Mol Biol 2016; 1350:359-79. [PMID: 26820868 DOI: 10.1007/978-1-4939-3043-2_18] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The lepidopteran insect cells used with the baculovirus expression vector system (BEVS) are capable of synthesizing and accurately processing foreign proteins. However, proteins expressed in baculovirus-infected cells often fail to be completely processed, or are not processed in a manner that meets a researcher's needs. This chapter discusses a metabolic engineering approach that addresses this problem. Basically, this approach involves the addition of new or enhancement of existing protein processing functions in established lepidopteran insect cell lines. In addition to improvements in protein processing, this approach has also been used to improve protein expression levels obtained with the BEVS. Methods for engineering cell lines and assessing their properties as improved hosts for the BEVS are detailed. Examples of lepidopteran insect cell lines engineered for improved protein N-glycosylation, folding/trafficking, and expression are described in detail.
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Affiliation(s)
- Robert L Harrison
- Invasive Insect Biocontrol & Behavior Laboratory, USDA, ARS, BARC, Building 007, Room 301, BARC-W, 10300 Baltimore Avenue, Beltsville, MD, 20705, USA.
| | - Donald L Jarvis
- Department of Molecular Biology, University of Wyoming, Laramie, WY, USA
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Impact of different temperatures on survival and energy metabolism in the Asian citrus psyllid, Diaphorina citri Kuwayama. Comp Biochem Physiol A Mol Integr Physiol 2015; 192:28-37. [PMID: 26603556 DOI: 10.1016/j.cbpa.2015.11.013] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2015] [Revised: 11/05/2015] [Accepted: 11/16/2015] [Indexed: 01/06/2023]
Abstract
Temperature influences the life history and metabolic parameters of insects. Asian citrus psyllid (ACP), Diaphorina citri is a tropical and subtropical pest. ACP invaded new regions around the world and threatened the citrus industry as a vector for Huanglongbing (HLB) disease. ACP is widely distributed and can survive high (up to 45 °C) and low temperatures (as low as -6 °C). The precise mechanism of temperature tolerance in ACP is poorly understood. We investigated adult survival, cellular energy balance, gene expression, and nucleotide and sugar-nucleotide changes under the effect of different temperature regimes (0 °C to 45 °C with 5 °C intervals). The optimum temperatures for survival were 20 and 25 °C. Low temperatures of 0 °C and 5 °C caused 50% mortality after 2 and 4 days respectively, while one day at high temperature (40 °C and 45 °C) caused more than 95% mortality. The lowest quantity of ATP (3.69 ± 1.6 ng/insect) and the maximum ATPase enzyme activities (57.43 ± 7.6 μU/insect) were observed at 25 °C. Correlation between ATP quantities and ATPase activity was negative. Gene expression of hsp 70, V-type proton ATPase catalytic subunit A and ATP synthase α subunit matched these results. Twenty-four nucleotides and sugar-nucleotides were quantified using HPLC in ACP adults maintained at low, high, and optimum temperatures. The nucleotide profiles were different among treatments. The ratios between AMP:ATP and ADP:ATP were significantly decreased and positively correlated to adults survival, whereas the adenylate energy charge was increased in response to low and high temperatures. Exploring energy metabolic regulation in relation with adult survival might help in understanding the physiological basis of how ACP tolerates newly invaded regions.
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Mabashi-Asazuma H, Kuo CW, Khoo KH, Jarvis DL. Modifying an Insect Cell N-Glycan Processing Pathway Using CRISPR-Cas Technology. ACS Chem Biol 2015; 10:2199-208. [PMID: 26241388 DOI: 10.1021/acschembio.5b00340] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Fused lobes (FDL) is an enzyme that simultaneously catalyzes a key trimming reaction and antagonizes elongation reactions in the insect N-glycan processing pathway. Accordingly, FDL function accounts, at least in part, for major differences in the N-glycosylation patterns of glycoproteins produced by insect and mammalian cells. In this study, we used the CRISPR-Cas9 system to edit the fdl gene in Drosophila melanogaster S2 cells. CRISPR-Cas9 editing produced a high frequency of site-specific nucleotide insertions and deletions, reduced the production of insect-type, paucimannosidic products (Man3GlcNAc2), and led to the production of partially elongated, mammalian-type complex N-glycans (GlcNAc2Man3GlcNAc2) in S2 cells. As CRISPR-Cas9 has not been widely used to analyze or modify protein glycosylation pathways or edit insect cell genes, these results underscore its broad utility as a tool for these purposes. Our results also confirm the key role of FDL at the major branch point distinguishing insect and mammalian N-glycan processing pathways. Finally, the new FDL-deficient S2 cell derivative produced in this study will enable future bottom-up glycoengineering efforts designed to isolate insect cell lines that can efficiently produce recombinant glycoproteins with chemically predefined oligosaccharide side-chain structures.
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Affiliation(s)
- Hideaki Mabashi-Asazuma
- Department
of Molecular Biology, University of Wyoming, Laramie, Wyoming 82071, United States
| | - Chu-Wei Kuo
- Institute
of Biological Chemistry, Academia Sinica 128 Nankang, Taipei 115, Taiwan
| | - Kay-Hooi Khoo
- Institute
of Biological Chemistry, Academia Sinica 128 Nankang, Taipei 115, Taiwan
| | - Donald L. Jarvis
- Department
of Molecular Biology, University of Wyoming, Laramie, Wyoming 82071, United States
- GlycoBac,
LLC, Laramie, Wyoming 82072, United States
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Tuning a MAb glycan profile in cell culture: Supplementing N-acetylglucosamine to favour G0 glycans without compromising productivity and cell growth. J Biotechnol 2015; 214:105-12. [PMID: 26387447 DOI: 10.1016/j.jbiotec.2015.09.014] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2015] [Revised: 07/28/2015] [Accepted: 09/15/2015] [Indexed: 11/23/2022]
Abstract
Glycosylation is a critical quality attribute of many therapeutic proteins, particularly monoclonal antibodies (MAbs). Nucleotide-sugar precursors supplemented to growth medium to affect the substrate supply chain of glycosylation has yielded promising but varied results for affecting glycosylation. Glucosamine (GlcN), a precursor for N-acetylglucosamine (GlcNAc), is a major component of mammalian glycans. The supplementation of GlcN to CHO cells stably-expressing a chimeric heavy-chain monoclonal antibody, EG2-hFc, reduces the complexity of glycans to favour G0 glycoforms, while also negatively impacting cell growth. Although several researchers have examined the supplementation of glucosamine, no clear explanation of its impact on cell growth has been forthcoming. In this work, the glucosamine metabolism is examined. We identified the acetylation of GlcN to produce GlcNAc to be the most likely cause for the negative impact on growth due to the depletion of intracellular acetyl-CoA pools in the cytosol. By supplementing GlcNAc in lieu of GlcN to CHO cells producing EG2-hFc, we achieve the same shift in glycan complexity with marginal impacts on the cell growth and protein production.
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Yin B, Gao Y, Chung CY, Yang S, Blake E, Stuczynski MC, Tang J, Kildegaard HF, Andersen MR, Zhang H, Betenbaugh MJ. Glycoengineering of Chinese hamster ovary cells for enhanced erythropoietin N-glycan branching and sialylation. Biotechnol Bioeng 2015; 112:2343-51. [PMID: 26154505 DOI: 10.1002/bit.25650] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2015] [Revised: 04/27/2015] [Accepted: 05/12/2015] [Indexed: 12/11/2022]
Abstract
Sialic acid, a terminal residue on complex N-glycans, and branching or antennarity can play key roles in both the biological activity and circulatory lifetime of recombinant glycoproteins of therapeutic interest. In order to examine the impact of glycosyltransferase expression on the N-glycosylation of recombinant erythropoietin (rEPO), a human α2,6-sialyltransferase (ST6Gal1) was expressed in Chinese hamster ovary (CHO-K1) cells. Sialylation increased on both EPO and CHO cellular proteins as observed by SNA lectin analysis, and HPLC profiling revealed that the sialic acid content of total glycans on EPO increased by 26%. The increase in sialic acid content was further verified by detailed profiling of the N-glycan structures using mass spectra (MS) analysis. In order to enhance antennarity/branching, UDP-N-acetylglucosamine: α-1,3-D-mannoside β1,4-N-acetylglucosaminyltransferase (GnTIV/Mgat4) and UDP-N-acetylglucosamine:α-1,6-D-mannoside β1,6-N-acetylglucosaminyltransferase (GnTV/Mgat5), was incorporated into CHO-K1 together with ST6Gal1. Tri- and tetraantennary N-glycans represented approximately 92% of the total N-glycans on the resulting EPO as measured using MS analysis. Furthermore, sialic acid content of rEPO from these engineered cells was increased ∼45% higher with tetra-sialylation accounting for ∼10% of total sugar chains compared to ∼3% for the wild-type parental CHO-K1. In this way, coordinated overexpression of these three glycosyltransferases for the first time in model CHO-K1 cell lines provides a mean for enhancing both N-glycan branching complexity and sialylation with opportunities to generate tailored complex N-glycan structures on therapeutic glycoproteins in the future.
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Affiliation(s)
- Bojiao Yin
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, Maryland
| | - Yuan Gao
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, Maryland
| | - Cheng-Yu Chung
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, Maryland
| | - Shuang Yang
- Department of Pathology, Johns Hopkins University, Baltimore, Maryland
| | - Emily Blake
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, Maryland
| | - Mark C Stuczynski
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, Maryland
| | - Juechun Tang
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, Maryland
| | - Helene F Kildegaard
- Novo Nordisk Foundation Center for Biosustainability, Technical University of Denmark, Hoersholm, Denmark
| | - Mikael R Andersen
- Department of Systems Biology, Technical University of Denmark, Kgs. Lyngby, Denmark
| | - Hui Zhang
- Department of Pathology, Johns Hopkins University, Baltimore, Maryland
| | - Michael J Betenbaugh
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, Maryland.
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