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Benavente MCR, Hakeem ZA, Davis AR, Murray NB, Azadi P, Mace EM, Barb AW. Distinct CD16a features on human NK cells observed by flow cytometry correlate with increased ADCC. Sci Rep 2024; 14:7938. [PMID: 38575779 PMCID: PMC10995120 DOI: 10.1038/s41598-024-58541-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2023] [Accepted: 04/01/2024] [Indexed: 04/06/2024] Open
Abstract
Natural killer (NK) cells destroy tissue that have been opsonized with antibodies. Strategies to generate or identify cells with increased potency are expected to enhance NK cell-based immunotherapies. We previously generated NK cells with increased antibody-dependent cell mediated cytotoxicity (ADCC) following treatment with kifunensine, an inhibitor targeting mannosidases early in the N-glycan processing pathway. Kifunensine treatment also increased the antibody-binding affinity of Fc γ receptor IIIa/CD16a. Here we demonstrate that inhibiting NK cell N-glycan processing increased ADCC. We reduced N-glycan processing with the CRIPSR-CAS9 knockdown of MGAT1, another early-stage N-glycan processing enzyme, and showed that these cells likewise increased antibody binding affinity and ADCC. These experiments led to the observation that NK cells with diminished N-glycan processing capability also revealed a clear phenotype in flow cytometry experiments using the B73.1 and 3G8 antibodies binding two distinct CD16a epitopes. We evaluated this "affinity profiling" approach using primary NK cells and identified a distinct shift and differentiated populations by flow cytometry that correlated with increased ADCC.
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Affiliation(s)
- Maria C Rodriguez Benavente
- Department of Biochemistry and Molecular Biology, University of Georgia, 120 E. Green St., 30602, Athens, GA, Georgia
| | - Zainab A Hakeem
- Department of Biochemistry and Molecular Biology, University of Georgia, 120 E. Green St., 30602, Athens, GA, Georgia
| | - Alexander R Davis
- Department of Biochemistry and Molecular Biology, University of Georgia, 120 E. Green St., 30602, Athens, GA, Georgia
| | - Nathan B Murray
- Complex Carbohydrate Research Center, University of Georgia, Athens, GA, Georgia
| | - Parastoo Azadi
- Department of Biochemistry and Molecular Biology, University of Georgia, 120 E. Green St., 30602, Athens, GA, Georgia
- Complex Carbohydrate Research Center, University of Georgia, Athens, GA, Georgia
| | - Emily M Mace
- Department of Pediatrics, Columbia University Irving Medical Center, New York, NY, USA
| | - Adam W Barb
- Department of Biochemistry and Molecular Biology, University of Georgia, 120 E. Green St., 30602, Athens, GA, Georgia.
- Complex Carbohydrate Research Center, University of Georgia, Athens, GA, Georgia.
- Department of Chemistry, University of Georgia, Athens, GA, Georgia.
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Liu Y, Li M, Lin M, Liu X, Guo H, Tan J, Hu L, Li J, Zhou Q. ALKBH1 promotes HIF-1α-mediated glycolysis by inhibiting N-glycosylation of LAMP2A. Cell Mol Life Sci 2024; 81:130. [PMID: 38472355 DOI: 10.1007/s00018-024-05152-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2023] [Revised: 01/25/2024] [Accepted: 02/01/2024] [Indexed: 03/14/2024]
Abstract
ALKBH1 is a typical demethylase of nucleic acids, which is correlated with multiple types of biological processes and human diseases. Recent studies are focused on the demethylation of ALKBH1, but little is known about its non-demethylase function. Here, we demonstrate that ALKBH1 regulates the glycolysis process through HIF-1α signaling in a demethylase-independent manner. We observed that depletion of ALKBH1 inhibits glycolysis flux and extracellular acidification, which is attributable to reduced HIF-1α protein levels, and it can be rescued by reintroducing HIF-1α. Mechanistically, ALKBH1 knockdown enhances chaperone-mediated autophagy (CMA)-mediated HIF-1α degradation by facilitating the interaction between HIF-1α and LAMP2A. Furthermore, we identify that ALKBH1 competitively binds to the OST48, resulting in compromised structural integrity of oligosaccharyltransferase (OST) complex and subsequent defective N-glycosylation of LAMPs, particularly LAMP2A. Abnormal glycosylation of LAMP2A disrupts lysosomal homeostasis and hinders the efficient degradation of HIF-1α through CMA. Moreover, NGI-1, a small-molecule inhibitor that selectively targets the OST complex, could inhibit the glycosylation of LAMPs caused by ALKBH1 silencing, leading to impaired CMA activity and disruption of lysosomal homeostasis. In conclusion, we have revealed a non-demethylation role of ALKBH1 in regulating N-glycosylation of LAMPs by interacting with OST subunits and CMA-mediated degradation of HIF-1α.
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Affiliation(s)
- Yanyan Liu
- Key Laboratory of Regenerative Medicine of Ministry of Education, The First Affiliated Hospital, Jinan University, Guangzhou, 510632, Guangdong, China
- The College of Life Science and Technology, Jinan University, Guangzhou, 510632, Guangdong, China
- The Biomedical Translational Research Institute, Health Science Center (School of Medicine), Jinan University, Guangzhou, 510632, Guangdong, China
| | - Mengmeng Li
- The College of Life Science and Technology, Jinan University, Guangzhou, 510632, Guangdong, China
- The Biomedical Translational Research Institute, Health Science Center (School of Medicine), Jinan University, Guangzhou, 510632, Guangdong, China
| | - Miao Lin
- Key Laboratory of Regenerative Medicine of Ministry of Education, The First Affiliated Hospital, Jinan University, Guangzhou, 510632, Guangdong, China
- The Biomedical Translational Research Institute, Health Science Center (School of Medicine), Jinan University, Guangzhou, 510632, Guangdong, China
| | - Xinjie Liu
- The College of Life Science and Technology, Jinan University, Guangzhou, 510632, Guangdong, China
- The Biomedical Translational Research Institute, Health Science Center (School of Medicine), Jinan University, Guangzhou, 510632, Guangdong, China
| | - Haolin Guo
- The College of Life Science and Technology, Jinan University, Guangzhou, 510632, Guangdong, China
- The Biomedical Translational Research Institute, Health Science Center (School of Medicine), Jinan University, Guangzhou, 510632, Guangdong, China
| | - Junyang Tan
- Key Laboratory of Regenerative Medicine of Ministry of Education, The First Affiliated Hospital, Jinan University, Guangzhou, 510632, Guangdong, China
- The Biomedical Translational Research Institute, Health Science Center (School of Medicine), Jinan University, Guangzhou, 510632, Guangdong, China
| | - Liubing Hu
- Key Laboratory of Regenerative Medicine of Ministry of Education, The First Affiliated Hospital, Jinan University, Guangzhou, 510632, Guangdong, China
- The Biomedical Translational Research Institute, Health Science Center (School of Medicine), Jinan University, Guangzhou, 510632, Guangdong, China
| | - Jianshuang Li
- The College of Life Science and Technology, Jinan University, Guangzhou, 510632, Guangdong, China.
- The Biomedical Translational Research Institute, Health Science Center (School of Medicine), Jinan University, Guangzhou, 510632, Guangdong, China.
| | - Qinghua Zhou
- Key Laboratory of Regenerative Medicine of Ministry of Education, The First Affiliated Hospital, Jinan University, Guangzhou, 510632, Guangdong, China.
- The College of Life Science and Technology, Jinan University, Guangzhou, 510632, Guangdong, China.
- The Biomedical Translational Research Institute, Health Science Center (School of Medicine), Jinan University, Guangzhou, 510632, Guangdong, China.
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Li X, Shi B, Huang JW, Zeng Z, Yang Y, Zhang L, Min J, Chen CC, Guo RT. Functional tailoring of a PET hydrolytic enzyme expressed in Pichia pastoris. BIORESOUR BIOPROCESS 2023; 10:26. [PMID: 38647782 PMCID: PMC10991172 DOI: 10.1186/s40643-023-00648-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Accepted: 03/27/2023] [Indexed: 04/25/2024] Open
Abstract
Using enzymes to hydrolyze and recycle poly(ethylene terephthalate) (PET) is an attractive eco-friendly approach to manage the ever-increasing PET wastes, while one major challenge to realize the commercial application of enzyme-based PET degradation is to establish large-scale production methods to produce PET hydrolytic enzyme. To achieve this goal, we exploited the industrial strain Pichia pastoris to express a PET hydrolytic enzyme from Caldimonas taiwanensis termed CtPL-DM. In contrast to the protein expressed in Escherichia coli, CtPL-DM expressed in P. pastoris is inactive in PET degradation. Structural analysis indicates that a putative N-glycosylation site N181 could restrain the conformational change of a substrate-binding Trp and hamper the enzyme action. We thus constructed N181A to remove the N-glycosylation and found that the PET hydrolytic activity of this variant was restored. The performance of N181A was further enhanced via molecular engineering. These results are of valuable in terms of PET hydrolytic enzyme production in industrial strains in the future.
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Affiliation(s)
- Xian Li
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Hubei Hongshan Laboratory, Hubei Collaborative Innovation Center for Green Transformation of Bio-Resources, Hubei Key Laboratory of Industrial Biotechnology, School of Life Sciences, Hubei University, Wuhan, 430062, People's Republic of China
| | - Beilei Shi
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Hubei Hongshan Laboratory, Hubei Collaborative Innovation Center for Green Transformation of Bio-Resources, Hubei Key Laboratory of Industrial Biotechnology, School of Life Sciences, Hubei University, Wuhan, 430062, People's Republic of China
| | - Jian-Wen Huang
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Hubei Hongshan Laboratory, Hubei Collaborative Innovation Center for Green Transformation of Bio-Resources, Hubei Key Laboratory of Industrial Biotechnology, School of Life Sciences, Hubei University, Wuhan, 430062, People's Republic of China
| | - Ziyin Zeng
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Hubei Hongshan Laboratory, Hubei Collaborative Innovation Center for Green Transformation of Bio-Resources, Hubei Key Laboratory of Industrial Biotechnology, School of Life Sciences, Hubei University, Wuhan, 430062, People's Republic of China
| | - Yu Yang
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Hubei Hongshan Laboratory, Hubei Collaborative Innovation Center for Green Transformation of Bio-Resources, Hubei Key Laboratory of Industrial Biotechnology, School of Life Sciences, Hubei University, Wuhan, 430062, People's Republic of China
| | - Lilan Zhang
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Hubei Hongshan Laboratory, Hubei Collaborative Innovation Center for Green Transformation of Bio-Resources, Hubei Key Laboratory of Industrial Biotechnology, School of Life Sciences, Hubei University, Wuhan, 430062, People's Republic of China
| | - Jian Min
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Hubei Hongshan Laboratory, Hubei Collaborative Innovation Center for Green Transformation of Bio-Resources, Hubei Key Laboratory of Industrial Biotechnology, School of Life Sciences, Hubei University, Wuhan, 430062, People's Republic of China
| | - Chun-Chi Chen
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Hubei Hongshan Laboratory, Hubei Collaborative Innovation Center for Green Transformation of Bio-Resources, Hubei Key Laboratory of Industrial Biotechnology, School of Life Sciences, Hubei University, Wuhan, 430062, People's Republic of China.
| | - Rey-Ting Guo
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Hubei Hongshan Laboratory, Hubei Collaborative Innovation Center for Green Transformation of Bio-Resources, Hubei Key Laboratory of Industrial Biotechnology, School of Life Sciences, Hubei University, Wuhan, 430062, People's Republic of China.
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