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Wei X, Su R, Yang M, Pan B, Lu J, Lin H, Shu W, Wang R, Xu X. Quantitative proteomic profiling of hepatocellular carcinoma at different serum alpha-fetoprotein level. Transl Oncol 2022; 20:101422. [PMID: 35430532 PMCID: PMC9034393 DOI: 10.1016/j.tranon.2022.101422] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2021] [Revised: 03/30/2022] [Accepted: 03/30/2022] [Indexed: 11/08/2022] Open
Abstract
Serum AFP equal to 400 ng/mL is a pivotal turning point not only in prognosis but also metabolic and invasion associated pathways. Adjacent noncancerous tissues are not biological normal components at protein level. Four druggable targets (C1QBP, HSPE1, CHDH, ITGAL) are identified as potential prognostic biomarkers in hepatocellular carcinoma.
Purpose Hepatocellular carcinoma (HCC) is characterized by a poor long-term prognosis and high mortality rate. Serum alpha-fetoprotein (AFP) levels show great prognostic value in patients undergoing hepatectomy. This study aims to explore proteomic profiling in HCC samples based on AFP subgroups and identify potential key targets involved in HCC progression. Methods Twelve paired tumor and adjacent noncancerous tissue samples were collected from patients with HCC who underwent primary curative resection from January 2012 to December 2013. Clinical information was curated from four tissue microarrays to conduct survival analysis based on serum AFP levels. TMT-based quantitative proteomic analyses and bioinformatics analyses were performed to comprehensively profile molecular features. Immunohistochemistry was carried out to validate protein expression of identified targets. Kaplan-Meier survival analysis was performed to assess the overall survival and recurrence-free survival based on protein expressions. Results AFP (400 ng/mL) was a turning point in prognosis, metabolic- and invasion-associated pathways. The mass spectrometry analysis yielded a total of 5573 identified proteins. Annotations of 151 differentially expressed proteins in tumors and 95 proteins in paracancerous tissues (1.2-fold) showed similarities in biological processes, cellular components, molecular functions. Furthermore, differentially expressed hub proteins with five innovatively nominated druggable targets (C1QBP, HSPE1, GLUD2 for tumors and CHDH, ITGAL for paracancerous tissues), of which four (C1QBP, HSPE1, CHDH, ITGAL) targets were associated with poor overall survival (all Log-rank P < 0.05). Conclusions Our quantitative proteomics analyses identified four key prognostic biomarkers in HCC and provide opportunities for translational medicine and new treatment.
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Huang S, Jia R, Hu R, Zhai W, Jiang S, Li W, Wang F, Xu Q. Specific immunity proteomic profile of the skin mucus of Antarctic fish Chionodraco hamatus and Notothenia coriiceps. JOURNAL OF FISH BIOLOGY 2021; 99:1998-2007. [PMID: 34520045 DOI: 10.1111/jfb.14908] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Revised: 09/03/2021] [Accepted: 09/09/2021] [Indexed: 06/13/2023]
Abstract
The white-blooded Antarctic icefish is the only known vertebrate lacking oxygen-transporting haemoglobins. Fish skin mucus, as the first line of defence against pathogens, can reflect fish welfare. In this study, we analysed the skin mucus proteome profiles of the two Antarctic fish species, the white-blooded Antarctic icefish, Chionodraco hamatus, and the red-blooded Antarctic fish, Notothenia coriiceps, unfolding the different proteins by liquid chromatography coupled with tandem mass spectrometry isobaric tags for relative and absolute quantitation (iTRAQ) technology. Of the 4444 totally identified proteins, 227 differentially expressed proteins (DEPs) were found in the comparison between C. hamatus and N. coriiceps, of which 121 were upregulated and 106 were downregulated in the icefish. In the Kyoto Encyclopedia of Genes and Genomes pathway annotation, we found two pathways "Legionellosis" and "Complement and coagulation cascades" were significantly enriched, among of which innate immune candidate proteins such as C3, CASP1, ASC, F3 and C9 were significantly upregulated, suggesting their important roles in C. hamatus immune system. Additionally, the DEP protein-protein interaction network analysis and "Response to stress" GO category provided candidate biomarkers for deep understanding of the distinct immune response of the two Antarctic fish underlying the cold adaptation.
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Affiliation(s)
- Shaojun Huang
- Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education, College of Marine Sciences, Shanghai Ocean University, Shanghai, China
| | - Ruonan Jia
- Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education, College of Marine Sciences, Shanghai Ocean University, Shanghai, China
| | - Ruiqin Hu
- Key Laboratory of Aquaculture Resources and Utilization, Ministry of Education, College of Fisheries and Life Sciences, Shanghai Ocean University, Shanghai, China
| | - Wanying Zhai
- Key Laboratory of Aquaculture Resources and Utilization, Ministry of Education, College of Fisheries and Life Sciences, Shanghai Ocean University, Shanghai, China
| | - Shouwen Jiang
- Key Laboratory of Aquaculture Resources and Utilization, Ministry of Education, College of Fisheries and Life Sciences, Shanghai Ocean University, Shanghai, China
| | - Wenhao Li
- Key Laboratory of Aquaculture Resources and Utilization, Ministry of Education, College of Fisheries and Life Sciences, Shanghai Ocean University, Shanghai, China
| | - Faxiang Wang
- Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education, College of Marine Sciences, Shanghai Ocean University, Shanghai, China
| | - Qianghua Xu
- Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education, College of Marine Sciences, Shanghai Ocean University, Shanghai, China
- National Distant-water Fisheries Engineering Research Center, Shanghai Ocean University, Shanghai, China
- Collaborative Innovation Center for Distant-water Fisheries, Shanghai, China
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3
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Kovács ÁF, Fekete N, Turiák L, Ács A, Kőhidai L, Buzás EI, Pállinger É. Unravelling the Role of Trophoblastic-Derived Extracellular Vesicles in Regulatory T Cell Differentiation. Int J Mol Sci 2019; 20:ijms20143457. [PMID: 31337116 PMCID: PMC6678568 DOI: 10.3390/ijms20143457] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2019] [Revised: 07/09/2019] [Accepted: 07/11/2019] [Indexed: 12/30/2022] Open
Abstract
Regulatory T cells (Treg) are mandatory elements in the maintenance of human pregnancy, but their de novo differentiation has not been completely exposed. HSPE1 chaperone expressing trophoblast cells may have a role in it. Trophoblast-derived extracellular vesicles (EVs), either at the feto–maternal interface or in circulation, target CD4+ T cells. We hypothesized that HSPE1-associated trophoblastic cell line (BeWo)-derived EVs are active mediators of Treg cell differentiation. We proved at first that recombinant HSPE1 promote human Treg cell differentiation in vitro. Developing a CRISPR-Cas9 based HSPE1 knockout BeWo cell line we could also demonstrate, that EV-associated HSPE1 induces Treg development. Next-generation sequencing of miRNA cargo of BeWo-EVs characterized the regulatory processes of Treg polarization. By the use of single-cell transcriptomics analysis, seven Treg cell subtypes were distinguished and we demonstrated for the first time that the expression level of HSPE1 was Treg subtype dependent, and CAPG expression is characteristic to memory phenotype of T cells. Our data indicate that HSPE1 and CAPG may be used as markers for identification of Treg subtypes. Our results suggest, that trophoblastic-derived iEVs-associated HSPE1 and miRNA cargo have an important role in Treg cell expansion in vitro and HSPE1 is a useful marker of Treg subtype characterization.
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Affiliation(s)
- Árpád Ferenc Kovács
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, H-1085 Budapest, Hungary.
| | - Nóra Fekete
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, H-1085 Budapest, Hungary
| | - Lilla Turiák
- MS Proteomics Research Group, Research Centre for Natural Sciences, Hungarian Academy of Sciences, H-1051 Budapest, Hungary
| | - András Ács
- MS Proteomics Research Group, Research Centre for Natural Sciences, Hungarian Academy of Sciences, H-1051 Budapest, Hungary
| | - László Kőhidai
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, H-1085 Budapest, Hungary
| | - Edit I Buzás
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, H-1085 Budapest, Hungary
- MTA-SE Immune-Proteogenomics Extracellular Vesicle Research Group, H-1085 Budapest, Hungary
- HCEMM-SE Extracellular Vesicle Research Group, H-1085 Budapest, Hungary
| | - Éva Pállinger
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, H-1085 Budapest, Hungary
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4
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Tsai CH, Chen YT, Chang YH, Hsueh C, Liu CY, Chang YS, Chen CL, Yu JS. Systematic verification of bladder cancer-associated tissue protein biomarker candidates in clinical urine specimens. Oncotarget 2018; 9:30731-30747. [PMID: 30112103 PMCID: PMC6089400 DOI: 10.18632/oncotarget.24578] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2017] [Accepted: 02/20/2018] [Indexed: 12/29/2022] Open
Abstract
Bladder cancer biomarkers currently approved by the Food and Drug Administration are insufficiently reliable for use in non-invasive clinical diagnosis. Verification/validation of numerous biomarker candidates for BC detection is a crucial bottleneck for novel biomarker development. A multiplexed liquid chromatography multiple-reaction-monitoring mass spectrometry assay of 122 proteins, including 118 up-regulated tissue proteins, two known bladder cancer biomarkers and two housekeeping gene products, was successfully established for protein quantification in clinical urine specimens. Quantification of 122 proteins was performed on a large cohort of urine specimens representing a variety of conditions, including 142 hernia, 126 bladder cancer, 67 hematuria, and 59 urinary tract infection samples. ANXA3 (annexin A3) and HSPE1 (heat shock protein family E member 1), which showed the highest detection frequency in bladder cancer samples, were selected for further validation. Western blotting showed that urinary ANXA3 and HSPE1 protein levels were higher in bladder cancer samples than in hernia samples, and enzyme-linked immunosorbent assays confirmed a higher urinary concentration of HSPE1 in bladder cancer than in hernia, hematuria and urinary tract infection. Immunohistochemical analyses showed significantly elevated levels of HSPE1 in tumor cells compared with non-cancerous bladder epithelial cells, suggesting that HSPE1 could be a useful tumor tissue marker for the specific detection of bladder cancer. Collectively, our findings provide valuable information for future validation of potential biomarkers for bladder cancer diagnosis.
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Affiliation(s)
- Cheng-Han Tsai
- Graduate Institute of Biomedical Sciences, College of Medicine, Chang Gung University, Taoyuan, Taiwan
| | - Yi-Ting Chen
- Graduate Institute of Biomedical Sciences, College of Medicine, Chang Gung University, Taoyuan, Taiwan.,Molecular Medicine Research Center, College of Medicine, Chang Gung University, Taoyuan, Taiwan.,Department of Biomedical Sciences, College of Medicine, Chang Gung University, Taoyuan, Taiwan.,Department of Nephrology, Chang Gung Memorial Hospital, Linkou Medical Center, Taoyuan, Taiwan
| | - Ying-Hsu Chang
- Division of Urology, Department of Surgery, LinKou Chang Gung Memorial Hospital, Taoyuan, Taiwan.,Graduate Institute of Clinical Medical Sciences, College of Medicine, Chang Gung University, Taoyuan, Taiwan
| | - Chuen Hsueh
- Molecular Medicine Research Center, College of Medicine, Chang Gung University, Taoyuan, Taiwan.,Department of Pathology, Chang Gung Memorial Hospital, Linkou, Chang Gung University, College of Medicine, Taoyuan, Taiwan
| | - Chung-Yi Liu
- Division of Urology, Department of Surgery, LinKou Chang Gung Memorial Hospital, Taoyuan, Taiwan
| | - Yu-Sun Chang
- Graduate Institute of Biomedical Sciences, College of Medicine, Chang Gung University, Taoyuan, Taiwan.,Molecular Medicine Research Center, College of Medicine, Chang Gung University, Taoyuan, Taiwan.,Department of Otolaryngology - Head & Neck Surgery, Chang Gung Memorial Hospital, Linkou, Taiwan
| | - Chien-Lun Chen
- Department of Urology, Chang Gung Memorial Hospital, Taoyuan, Taiwan.,College of Medicine, Chang Gung University, Taoyuan, Taiwan
| | - Jau-Song Yu
- Graduate Institute of Biomedical Sciences, College of Medicine, Chang Gung University, Taoyuan, Taiwan.,Molecular Medicine Research Center, College of Medicine, Chang Gung University, Taoyuan, Taiwan.,Liver Research Center, Chang Gung Memorial Hospital, Linkou, Taiwan.,Research Center for Food and Cosmetic Safety, Research Center for Chinese Herbal Medicine, College of Human Ecology, Chang Gung University of Science and Technology, Taoyuan, Taiwan
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5
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Shah MA, Mishra S, Chaudhuri TK. Marginal stability drives irreversible unfolding of large multi-domain family 3 glycosylhydrolases from thermo-tolerant yeast. Int J Biol Macromol 2017; 108:1322-1330. [PMID: 29141194 DOI: 10.1016/j.ijbiomac.2017.11.041] [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: 08/30/2017] [Revised: 11/01/2017] [Accepted: 11/08/2017] [Indexed: 10/18/2022]
Abstract
Protein folding is an extremely complex and fast, yet perfectly defined process, involving interplay of many intra and inter-molecular forces. In vitro, these molecular interactions are reversible for many proteins e.g., smaller and monomeric, organized into single domains. However, refolding of larger multi-domain/multimeric proteins is much more complicated, proceeds in a hierarchal way and is often irreversible. In a comparative study on two large, multi-domain and multimeric isozymes, β-glucosidase I (BGLI) and β-glucosidase II (BGLII) from Pichia etchellsii, we studied spontaneous and assisted refolding under three denaturing conditions viz. GdnHCl, alkaline pH and heat. During refolding, higher refolding yields were obtained for BGLII in case of pH induced unfolding (13.89%±0.25) than BGLI (6%±0.85) while for GdnHCl induced unfolding, refolding was marginal (BGLI=5%±0.5; BGLII=6%±0.69). Thermal unfolding was irreversible while assisted refolding also showed little structural gain for both proteins. When the apparent free energies of unfolding (ΔGUapp) were calculated from GdnHCl unfolding data, their values were strikingly found to be lower (BGLI ΔGUapp=3.02kcal/mol; BGLII ΔGUapp=2.99kcal/mol) than reported for globular (ΔGU=5-15kcal/mol)/multimeric proteins (ΔGU=23-29kcal/mol) indicating marginal stability results in low refolding.
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Affiliation(s)
- Mohammad Asif Shah
- Department of Biochemical Engineering & Biotechnology, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India.
| | - Saroj Mishra
- Department of Biochemical Engineering & Biotechnology, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
| | - Tapan Kumar Chaudhuri
- Department of Biochemical Engineering & Biotechnology, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India; Ksuma School of Biological Sciences, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India.
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6
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MacKenzie JA, Payne RM. Mitochondrial protein import and human health and disease. Biochim Biophys Acta Mol Basis Dis 2006; 1772:509-23. [PMID: 17300922 PMCID: PMC2702852 DOI: 10.1016/j.bbadis.2006.12.002] [Citation(s) in RCA: 82] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2006] [Revised: 12/06/2006] [Accepted: 12/07/2006] [Indexed: 12/31/2022]
Abstract
The targeting and assembly of nuclear-encoded mitochondrial proteins are essential processes because the energy supply of humans is dependent upon the proper functioning of mitochondria. Defective import of mitochondrial proteins can arise from mutations in the targeting signals within precursor proteins, from mutations that disrupt the proper functioning of the import machinery, or from deficiencies in the chaperones involved in the proper folding and assembly of proteins once they are imported. Defects in these steps of import have been shown to lead to oxidative stress, neurodegenerative diseases, and metabolic disorders. In addition, protein import into mitochondria has been found to be a dynamically regulated process that varies in response to conditions such as oxidative stress, aging, drug treatment, and exercise. This review focuses on how mitochondrial protein import affects human health and disease.
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Affiliation(s)
- James A MacKenzie
- Department of Biological Sciences, 133 Piez Hall, State University of New York at Oswego, Oswego, NY 13126, USA.
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7
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van der Giezen M, León-Avila G, Tovar J. Characterization of chaperonin 10 (Cpn10) from the intestinal human pathogen Entamoeba histolytica. MICROBIOLOGY-SGM 2005; 151:3107-3115. [PMID: 16151221 DOI: 10.1099/mic.0.28068-0] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Entamoeba histolytica is the causative agent of amoebiasis, a poverty-related disease that kills an estimated 100 000 people each year. E. histolytica does not contain "standard mitochondria", but harbours mitochondrial remnant organelles called mitosomes. These organelles are characterized by the presence of mitochondrial chaperonin Cpn60, but little else is known about the functions and molecular composition of mitosomes. In this study, a gene encoding molecular chaperonin Cpn10--the functional partner of Cpn60--was cloned, and its structure and expression were characterized, as well as the cellular localization of its encoded protein. The 5' untranslated region of the gene contains all of the structural promoter elements required for transcription in this organism. The amoebic Cpn10, like Cpn60, is not significantly upregulated upon heat-shock treatment. Computer-assisted protein modelling, and specific antibodies against Cpn10 and Cpn60, suggest that both proteins interact with each other, and that they function in the same intracellular compartment. Thus, E. histolytica appears to have retained at least two of the key molecular components required for the refolding of imported mitosomal proteins.
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Affiliation(s)
- Mark van der Giezen
- School of Biological Sciences, Royal Holloway, University of London, Egham, Surrey TW20 0EX, UK
| | - Gloria León-Avila
- School of Biological Sciences, Royal Holloway, University of London, Egham, Surrey TW20 0EX, UK
| | - Jorge Tovar
- School of Biological Sciences, Royal Holloway, University of London, Egham, Surrey TW20 0EX, UK
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8
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Betsou F, Sueur JM, Orfila J. Serological investigation of Chlamydia trachomatis heat shock protein 10. Infect Immun 1999; 67:5243-6. [PMID: 10496901 PMCID: PMC96876 DOI: 10.1128/iai.67.10.5243-5246.1999] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The humoral immune response to Chlamydia trachomatis 10-kDa heat shock protein (Chsp10) in populations of Russian and French origin was studied by using a recombinant Chsp10 enzyme-linked immunosorbent assay. A physiological but not a serological correlation of Chsp10 exposure with Chsp60 exposure was observed in the Russian population. In the French population studied, there was a significant association between detection of anti-r-Chsp10 immunoglobulin G (IgG) antibodies and chronic genital tract infections. Chsp10 residues 50 to 67 were found to contain an immunodominant although not universal B epitope. Cross-reactions with Chlamydia pneumoniae or Escherichia coli GroES protein are limited but may occur. Our study suggests that detection of anti-Chsp10 IgG antibodies is associated with chronicity of C. trachomatis genital tract infection and does not parallel that of anti-Chsp60 IgG antibodies.
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Affiliation(s)
- F Betsou
- Biobanque de Picardie, University Hospital, Amiens, France
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9
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Huang YS, Chuang DT. Mechanisms for GroEL/GroES-mediated folding of a large 86-kDa fusion polypeptide in vitro. J Biol Chem 1999; 274:10405-12. [PMID: 10187830 DOI: 10.1074/jbc.274.15.10405] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Our understanding of mechanisms for GroEL/GroES-assisted protein folding to date has been derived mostly from studies with small proteins. Little is known concerning the interaction of these chaperonins with large multidomain polypeptides during folding. In the present study, we investigated chaperonin-dependent folding of a large 86-kDa fusion polypeptide, in which the mature maltose-binding protein (MBP) sequence was linked to the N terminus of the alpha subunit of the decarboxylase (E1) component of the human mitochondrial branched-chain alpha-ketoacid dehydrogenase complex. The fusion polypeptide, MBP-alpha, when co-expressed with the beta subunit of E1, produced a chimeric protein MBP-E1 with an (MBP-alpha)2beta2 structure, similar to the alpha2 beta2 structure in native E1. Reactivation of MBP-E1 denatured in 8 M urea was absolutely dependent on GroEL/GroES and Mg2+-ATP, and exhibited strikingly slow kinetics with a rate constant of 376 M-1 s-1, analogous to denatured untagged E1. Chaperonin-mediated refolding of the MBP-alpha fusion polypeptide showed that the folding of the MBP moiety was about 7-fold faster than that of the alpha moiety on the same chain with rate constants of 1.9 x 10(-3) s-1 and 2.95 x 10(-4) s-1, respectively. This explained the occurrence of an MBP-alpha. GroEL binary complex that was isolated with amylose resin from the refolding mixture and transformed Escherichia coli lysates. The data support the thesis that distinct functional sequences in a large polypeptide exhibit different folding characteristics on the same GroEL scaffold. Moreover, we show that when the alpha.GroEL complex (molar ratio 1:1) was incubated with GroES, the latter was capable of capping either the very ring that harbored the 48-kDa (His)6-alpha polypeptide (in cis) or the opposite unoccupied cavity (in trans). In contrast, the MBP-alpha.GroEL (1:1) complex was capped by GroES exclusively in the trans configuration. These findings suggest that the productive folding of a large multidomain polypeptide can only occur in the GroEL cavity that is not sequestered by GroES.
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Affiliation(s)
- Y S Huang
- Department of Biochemistry and the Biochemistry and Molecular Biology Graduate Program, University of Texas Southwestern Medical Center, Dallas, Texas 75235, USA
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10
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Minto M, Galli G, Gianazza E, Eberini I, Legname G, Fossati G, Modena D, Marcucci F, Mascagni P, Ghezzi P, Fratelli M. Mycobacterial Cpn10 promotes recognition of the mammalian homologue by a mycobacterium-specific antiserum. BIOCHIMICA ET BIOPHYSICA ACTA 1998; 1403:151-7. [PMID: 9630589 DOI: 10.1016/s0167-4889(98)00034-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Self-tolerance, a key feature of the immune system, is still a matter of intense debate. We give here evidence for a peculiar behavior of an antiserum against Mycobacterium tuberculosis chaperonin 10 (m-Cpn10), which could have implications for the mechanism of self-recognition by antibodies against non-self. We show that this antiserum can interact in terms of both inhibition of biological activity and physical association (immunoprecipitation), with the mammalian homologue of m-Cpn10, but only if the bacterial protein is present. Several lines of evidence led us to exclude that the two proteins physically associate to form heterocomplexes: (1) the behavior of the antiserum was not shared by a monoclonal antibody against m-Cpn10; (2) a matrix selective for human Cpn10 (h-Cpn10) did not co-purify m-Cpn10; (3) the distribution pattern in non-denaturing isoelectric focusing of labeled m-Cpn10 was not altered by the presence of the unlabeled h-Cpn10. We conclude therefore that the antiserum against M. tuberculosis Cpn10 also recognizes mammalian Cpn10, with an affinity/avidity regulated by the mycobacterial protein, or by the promotion of hetero-oligomerization. This emergence of self-recognition in the presence of M. tuberculosis Cpn10 could imply a breaking of self-tolerance in situations of infection or vaccination.
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Affiliation(s)
- M Minto
- Istituto di Ricerche Farmacologiche 'Mario Negri', Via Eritrea 62, I-20157 Milan, Italy
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11
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Viitanen PV, Lorimer G, Bergmeier W, Weiss C, Kessel M, Goloubinoff P. Purification of mammalian mitochondrial chaperonin 60 through in vitro reconstitution of active oligomers. Methods Enzymol 1998; 290:203-17. [PMID: 9534164 DOI: 10.1016/s0076-6879(98)90020-9] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- P V Viitanen
- Central Research and Development Department, E. I. duPont de Nemours and Company, Wilmington, Delaware 19880-0402, USA
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12
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Viitanen PV, Bacot K, Dickson R, Webb T. Purification of recombinant plant and animal GroES homologs: chloroplast and mitochondrial chaperonin 10. Methods Enzymol 1998; 290:218-30. [PMID: 9534165 DOI: 10.1016/s0076-6879(98)90021-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- P V Viitanen
- Central Research and Development Department, E. I. duPont de Nemours and Company, Wilmington, Delaware 19880-0402, USA
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13
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Ryan MT, Naylor DJ, Høj PB, Clark MS, Hoogenraad NJ. The role of molecular chaperones in mitochondrial protein import and folding. INTERNATIONAL REVIEW OF CYTOLOGY 1997; 174:127-93. [PMID: 9161007 DOI: 10.1016/s0074-7696(08)62117-8] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Molecular chaperones play a critical role in many cellular processes. This review concentrates on their role in targeting of proteins to the mitochondria and the subsequent folding of the imported protein. It also reviews the role of molecular chaperons in protein degradation, a process that not only regulates the turnover of proteins but also eliminates proteins that have folded incorrectly or have aggregated as a result of cell stress. Finally, the role of molecular chaperones, in particular to mitochondrial chaperonins, in disease is reviewed. In support of the endosymbiont theory on the origin of mitochondria, the chaperones of the mitochondrial compartment show a high degree of similarity to bacterial molecular chaperones. Thus, studies of protein folding in bacteria such as Escherichia coli have proved to be instructive in understanding the process in the eukaryotic cell. As in bacteria, the molecular chaperone genes of eukaryotes are activated by a variety of stresses. The regulation of stress genes involved in mitochondrial chaperone function is reviewed and major unsolved questions regarding the regulation, function, and involvement in disease of the molecular chaperones are identified.
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Affiliation(s)
- M T Ryan
- School of Biochemistry, La Trobe University, Bundoora, Victoria, Australia
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14
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Affiliation(s)
- A L Burlingame
- Department of Pharmaceutical Chemistry, University of California, San Francisco 94143-0446, USA
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15
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Fossati G, Lucietto P, Giuliani P, Coates AR, Harding S, Cölfen H, Legname G, Chan E, Zaliani A, Mascagni P. Mycobacterium tuberculosis chaperonin 10 forms stable tetrameric and heptameric structures. Implications for its diverse biological activities. J Biol Chem 1995; 270:26159-67. [PMID: 7592820 DOI: 10.1074/jbc.270.44.26159] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
The chaperonin activity of sequence-related chaperonin 10 proteins requires their aggregation into heptameric structures. We describe size-exclusion chromatography and ultracentrifugation studies that reveal that while Escherichia coli chaperonin 10 exists as a heptamer, the Mycobacterium tuberculosis chaperonin 10 is tetrameric in dilute solutions and in whole M. tuberculosis lysate. At high protein concentration and in the presence of saturating amounts of divalent ions, the protein is heptameric. Human chaperonin 10 is predominantly heptameric, although smaller oligomers were detected. These differences in structural assembly between species may explain differences in biological activity such as antigenicity. Using C-terminal and N-terminal fragments, sequence 1-25 was identified as indispensable for aggregation. CD spectroscopy studies revealed that (i) a minimum at 202-204 nm correlates with aggregation and characterizes not only the spectrum of the mycobacterial protein, but also those of E. coli and human chaperonin 10 proteins; (ii) the interactions between subunits are of the hydrophobic type; and (iii) the anti-parallel beta-pleated sheet is the main secondary structure element of subunits in both tetrameric and heptameric proteins.
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Affiliation(s)
- G Fossati
- Department of Chemistry, Italfarmaco Research Centre, Milan, Italy
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Ryan MT, Naylor DJ, Hoogenraad NJ, Høj PB. Affinity purification, overexpression, and characterization of chaperonin 10 homologues synthesized with and without N-terminal acetylation. J Biol Chem 1995; 270:22037-43. [PMID: 7665625 DOI: 10.1074/jbc.270.37.22037] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Utilizing the ability of bacterial chaperonin 60 (GroEL) to functionally interact with chaperonin 10 (Cpn10) homologues in an ATP-dependent fashion, we have purified substantial amounts of mammalian, chloroplast, and thermophilic Cpn10 homologues from their natural host. In addition, large amounts of recombinant rat Cpn10 were produced in Escherichia coli and found to be identical to its authentic counterpart except for the lack of N-terminal acetylation. By comparing these two forms of Cpn10, it was found that acetylation does not influence the oligomeric structure of Cpn10 and is not essential for chaperone activity or mitochondrial import in vitro. In contrast, N-terminal acetylation proved crucial in the protection of Cpn10 against degradation by N-ethylmaleimide-sensitive proteases derived from organellar preparations of rat liver. The availability of large amounts of both affinity-purified and recombinant Cpn10 will facilitate not only further characterization of the eukaryotic folding machinery but also further scrutiny of the reported function of Cpn10 as early pregnancy factor.
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Affiliation(s)
- M T Ryan
- School of Biochemistry, La Trobe University, Bundoora, Victoria, Australia
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Leyh T, Vogt T, Suo Y. The DNA sequence of the sulfate activation locus from Escherichia coli K-12. J Biol Chem 1992. [DOI: 10.1016/s0021-9258(19)50034-5] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
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