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Wang N, Waghray D, Caveney NA, Jude KM, Garcia KC. Structural insights into human MHC-II association with invariant chain. Proc Natl Acad Sci U S A 2024; 121:e2403031121. [PMID: 38687785 PMCID: PMC11087810 DOI: 10.1073/pnas.2403031121] [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: 02/13/2024] [Accepted: 03/29/2024] [Indexed: 05/02/2024] Open
Abstract
The loading of processed peptides on to major histocompatibility complex II (MHC-II) molecules for recognition by T cells is vital to cell-mediated adaptive immunity. As part of this process, MHC-II associates with the invariant chain (Ii) during biosynthesis in the endoplasmic reticulum to prevent premature peptide loading and to serve as a scaffold for subsequent proteolytic processing into MHC-II-CLIP. Cryo-electron microscopy structures of full-length Human Leukocyte Antigen-DR (HLA-DR) and HLA-DQ complexes associated with Ii, resolved at 3.0 to 3.1 Å, elucidate the trimeric assembly of the HLA/Ii complex and define atomic-level interactions between HLA, Ii transmembrane domains, loop domains, and class II-associated invariant chain peptides (CLIP). Together with previous structures of MHC-II peptide loading intermediates DO and DM, our findings complete the structural path governing class II antigen presentation.
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Affiliation(s)
- Nan Wang
- Department of Molecular and Cellular Physiology, Stanford University School of Medicine, Stanford, CA94305
- HHMI, Stanford University School of Medicine, Stanford, CA94305
| | - Deepa Waghray
- Department of Molecular and Cellular Physiology, Stanford University School of Medicine, Stanford, CA94305
| | - Nathanael A. Caveney
- Department of Molecular and Cellular Physiology, Stanford University School of Medicine, Stanford, CA94305
| | - Kevin M. Jude
- Department of Molecular and Cellular Physiology, Stanford University School of Medicine, Stanford, CA94305
- HHMI, Stanford University School of Medicine, Stanford, CA94305
| | - K. Christopher Garcia
- Department of Molecular and Cellular Physiology, Stanford University School of Medicine, Stanford, CA94305
- HHMI, Stanford University School of Medicine, Stanford, CA94305
- Department of Structural Biology, Stanford University School of Medicine, Stanford, CA94305
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2
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Gilles A, Hu L, Virdis F, Sant’Angelo DB, Dimitrova N, Hedrick JA, Denzin LK. The MHC Class II Antigen-Processing and Presentation Pathway Is Dysregulated in Type 1 Diabetes. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2023; 211:1630-1642. [PMID: 37811896 PMCID: PMC10872857 DOI: 10.4049/jimmunol.2300213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2023] [Accepted: 09/20/2023] [Indexed: 10/10/2023]
Abstract
Peptide loading of MHC class II (MHCII) molecules is facilitated by HLA-DM (DM), which catalyzes CLIP release, stabilizes empty MHCII, and edits the MHCII-bound peptide repertoire. HLA-DO (DO) binds to DM and modulates its activity, resulting in an altered set of peptides presented at the cell surface. MHCII-peptide presentation in individuals with type 1 diabetes (T1D) is abnormal, leading to a breakdown in tolerance; however, no direct measurement of the MHCII pathway activity in T1D patients has been performed. In this study, we measured MHCII Ag-processing pathway activity in humans by determining MHCII, MHCII-CLIP, DM, and DO levels by flow cytometry for peripheral blood B cells, dendritic cells, and monocytes from 99 T1D patients and 97 controls. Results showed that MHCII levels were similar for all three APC subsets. In contrast, MHCII-CLIP levels, independent of sex, age at blood draw, disease duration, and diagnosis age, were significantly increased for all three APCs, with B cells showing the largest increase (3.4-fold). DM and DO levels, which usually directly correlate with MHCII-CLIP levels, were unexpectedly identical in T1D patients and controls. Gene expression profiling on PBMC RNA showed that DMB mRNA was significantly elevated in T1D patients with residual C-peptide. This resulted in higher levels of DM protein in B cells and dendritic cells. DO levels were also increased, suggesting that the MHCII pathway maybe differentially regulated in individuals with residual C-peptide. Collectively, these studies show a dysregulation of the MHCII Ag-processing pathway in patients with T1D.
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Affiliation(s)
- Ambroise Gilles
- Rutgers Robert Wood Johnson Medical School, New Brunswick, NJ 08901, Current address: Division of Plastic Surgery, Department of Surgery, Penn State Health Milton S. Hershey Medical Center, Hershey, PA
| | - Lan Hu
- Oncology Informatics & Genomics, Philips North America, Cambridge, MA, 02141
| | - Francesca Virdis
- Child Health Institute of New Jersey, Rutgers Robert Wood Johnson Medical School, New Brunswick, NJ 08901, Current address: Istituto di Ricerca Genetica e Biomedica, Consiglio Nazionale delle Ricerche, Monserrato, Cagliari, Italy
| | - Derek B. Sant’Angelo
- Child Health Institute of New Jersey, Department of Pediatrics and Department of Pharmacology, Rutgers Robert Wood Johnson Medical School, and Graduate School of Biomedical Sciences, The State University of NJ, New Brunswick, NJ, 08901
| | - Nevenka Dimitrova
- Oncology Informatics and Genomics, Philips North America, Valhalla, NY 10598, Current address: Memorial Sloan-Kettering Cancer Center, New York, NY, 10065
| | | | - Lisa K. Denzin
- Child Health Institute of New Jersey, Department of Pediatrics and Department of Pharmacology, Rutgers Robert Wood Johnson Medical School, and Graduate School of Biomedical Sciences, The State University of NJ, New Brunswick, NJ, 08901
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3
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Wang L, Cao JB, Xia BB, Li YJ, Zhang X, Mo GX, Wang RJ, Guo SQ, Zhang YQ, Xiao K, Zhu GF, Liu PF, Song LC, Ma XH, Xiang PC, Wang J, Liu YH, Xie F, Zhang XD, Li XX, Sun WL, Cao Y, Wang KF, Zhang WH, Zhao WC, Yan P, Chen JC, Yang YW, Yu ZK, Tang JS, Xiao L, Zhou JM, Xie LX, Wang J. Metatranscriptome of human lung microbial communities in a cohort of mechanically ventilated COVID-19 Omicron patients. Signal Transduct Target Ther 2023; 8:432. [PMID: 37949875 PMCID: PMC10638395 DOI: 10.1038/s41392-023-01684-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2023] [Revised: 09/21/2023] [Accepted: 10/18/2023] [Indexed: 11/12/2023] Open
Abstract
The Omicron variant of the severe acute respiratory syndrome coronavirus 2 (SARS‑CoV‑2) infected a substantial proportion of Chinese population, and understanding the factors underlying the severity of the disease and fatality is valuable for future prevention and clinical treatment. We recruited 64 patients with invasive ventilation for COVID-19 and performed metatranscriptomic sequencing to profile host transcriptomic profiles, plus viral, bacterial, and fungal content, as well as virulence factors and examined their relationships to 28-day mortality were examined. In addition, the bronchoalveolar lavage fluid (BALF) samples from invasive ventilated hospital/community-acquired pneumonia patients (HAP/CAP) sampled in 2019 were included for comparison. Genomic analysis revealed that all Omicron strains belong to BA.5 and BF.7 sub-lineages, with no difference in 28-day mortality between them. Compared to HAP/CAP cohort, invasive ventilated COVID-19 patients have distinct host transcriptomic and microbial signatures in the lower respiratory tract; and in the COVID-19 non-survivors, we found significantly lower gene expressions in pathways related viral processes and positive regulation of protein localization to plasma membrane, higher abundance of opportunistic pathogens including bacterial Alloprevotella, Caulobacter, Escherichia-Shigella, Ralstonia and fungal Aspergillus sydowii and Penicillium rubens. Correlational analysis further revealed significant associations between host immune responses and microbial compositions, besides synergy within viral, bacterial, and fungal pathogens. Our study presents the relationships of lower respiratory tract microbiome and transcriptome in invasive ventilated COVID-19 patients, providing the basis for future clinical treatment and reduction of fatality.
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Affiliation(s)
- Lin Wang
- College of Pulmonary & Critical Care Medicine, 8th Medical Center of Chinese PLA General Hospital, Beijing, 100091, China
| | - Jia-Bao Cao
- CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101, China
| | - Bin-Bin Xia
- CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Yue-Juan Li
- CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Xuan Zhang
- CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101, China
- Faculty of Biological Science and Technology, Baotou Teacher's College, Baotou, 014030, China
| | - Guo-Xin Mo
- College of Pulmonary & Critical Care Medicine, 8th Medical Center of Chinese PLA General Hospital, Beijing, 100091, China
| | - Rui-Juan Wang
- Department of Respiratory Medicine, PLA Strategic Support Force Medical Center, Beijing, 100101, China
| | - Si-Qi Guo
- CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101, China
| | - Yu-Qing Zhang
- CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Kun Xiao
- College of Pulmonary & Critical Care Medicine, 8th Medical Center of Chinese PLA General Hospital, Beijing, 100091, China
| | - Guang-Fa Zhu
- Department of Respiratory and Critical Care Medicine, Beijing Anzhen Hospital, Capital Medical University, Beijing Institute of Heart, Lung and Blood Vessel Diseases, Beijing, 100029, China
| | - Peng-Fei Liu
- College of Pulmonary & Critical Care Medicine, 8th Medical Center of Chinese PLA General Hospital, Beijing, 100091, China
| | - Li-Cheng Song
- College of Pulmonary & Critical Care Medicine, 8th Medical Center of Chinese PLA General Hospital, Beijing, 100091, China
| | - Xi-Hui Ma
- Respiratory Research Institute, Department of Pulmonary & Critical Care Medicine, Beijing Key Laboratory of OTIR, the 8th Medical Center of Chinese PLA General Hospital, Beijing, 100091, China
| | - Ping-Chao Xiang
- Shougang hospital of Peking University, Beijing, 100144, China
| | - Jiang Wang
- College of Pulmonary & Critical Care Medicine, 8th Medical Center of Chinese PLA General Hospital, Beijing, 100091, China
| | - Yu-Hong Liu
- College of Pulmonary & Critical Care Medicine, 8th Medical Center of Chinese PLA General Hospital, Beijing, 100091, China
| | - Fei Xie
- College of Pulmonary & Critical Care Medicine, 8th Medical Center of Chinese PLA General Hospital, Beijing, 100091, China
| | - Xu-Dong Zhang
- CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Xiang-Xin Li
- Department of Respiratory Medicine, Beijing Changping Hospital, Beijing, 102200, China
| | - Wan-Lu Sun
- Department of Respiratory and Critical Care Medicine, Beijing Institute of Respiratory Medicine and Beijing Chao-Yang Hospital, Capital Medical University, Beijing, 100020, China
| | - Yan Cao
- Pulmonary research institute, Senior Department of Respiratory and Critical Care Medicine, the 8th medical center of Chinese PLA general hospital, Beijing, 100091, China
| | - Kai-Fei Wang
- College of Pulmonary & Critical Care Medicine, Chinese PLA General Hospital, Beijing, 100853, China
| | - Wen-Hui Zhang
- CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Wei-Chao Zhao
- Department of Respiratory Medicine, PLA Strategic Support Force Medical Center, Beijing, 100101, China
| | - Peng Yan
- China Aerospace Science & Industry Corporation 731 hospital, Beijing, 100074, China
| | - Ji-Chao Chen
- Department of Respiratory and Critical Care Medicine, Aerospace Center Hospital, Beijing, 100049, China
| | - Yu-Wei Yang
- Respiratory Research Institute, Department of Pulmonary & Critical Care Medicine, Beijing Key Laboratory of OTIR, the 8th Medical Center of Chinese PLA General Hospital, Beijing, 100091, China
| | - Zhong-Kuo Yu
- College of Pulmonary & Critical Care Medicine, 8th Medical Center of Chinese PLA General Hospital, Beijing, 100091, China
| | - Jing-Si Tang
- CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101, China
| | - Li Xiao
- Respiratory Research Institute, Department of Pulmonary & Critical Care Medicine, Beijing Key Laboratory of OTIR, the 8th Medical Center of Chinese PLA General Hospital, Beijing, 100091, China
| | - Jie-Min Zhou
- Vision Medicals Center for Infectious Diseases, Guangzhou, 510700, China
| | - Li-Xin Xie
- College of Pulmonary & Critical Care Medicine, 8th Medical Center of Chinese PLA General Hospital, Beijing, 100091, China.
| | - Jun Wang
- CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101, China.
- University of Chinese Academy of Sciences, Beijing, 100049, China.
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4
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Volk RF, Montaño JL, Warrington SE, Hofmann KL, Zaro BW. Proteomic characterization of phagocytic primary human monocyte-derived macrophages. RSC Chem Biol 2022; 3:783-793. [PMID: 35755185 PMCID: PMC9175098 DOI: 10.1039/d2cb00076h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2022] [Accepted: 05/12/2022] [Indexed: 11/21/2022] Open
Abstract
Macrophages play a vital role in the innate immune system, identifying and destroying unwanted cells. However, it has been difficult to attain a comprehensive understanding of macrophage protein abundance due to technical limitations. In addition, it remains unclear how changes in proteome composition are linked to phagocytic activity. In this study we developed methods to derive human macrophages and prepare them for mass spectrometry analysis in order to more-deeply understand the proteomic consequences of macrophage stimulation. Interferon gamma (IF-g), an immune stimulating cytokine, was used to induce macrophage activation, increasing phagocytosis of cancer cells by 2-fold. These conditions were used to perform comparative shotgun proteomics between resting macrophages and stimulated macrophages with increased phagocytic activity. Our analysis revealed that macrophages bias their protein production toward biological processes associated with phagocytosis and antigen processing in response to stimulation. We confirmed our findings by antibody-based western blotting experiments, validating both previously reported and novel proteins of interest. In addition to whole protein changes, we evaluated active protein synthesis by treating cells with the methionine surrogate probe homopropargylglycine (HPG). We saw increased rates of HPG incorporation during phagocytosis-inducing stimulation, suggesting protein synthesis rates are altered by stimulation. Together our findings provide the most comprehensive proteomic insight to date into primary human macrophages. We anticipate that this data can be used as a launchpoint to generate new hypotheses about innate immune function.
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Affiliation(s)
- Regan F Volk
- Department of Pharmaceutical Chemistry, Cardiovascular Research Institute, Quantitative Biosciences Institute, and Helen Diller Family Comprehensive Cancer Centre, University of California San Francisco CA USA
| | - José L Montaño
- Department of Pharmaceutical Chemistry, Cardiovascular Research Institute, Quantitative Biosciences Institute, and Helen Diller Family Comprehensive Cancer Centre, University of California San Francisco CA USA
| | - Sara E Warrington
- Department of Pharmaceutical Chemistry, Cardiovascular Research Institute, Quantitative Biosciences Institute, and Helen Diller Family Comprehensive Cancer Centre, University of California San Francisco CA USA
| | - Katherine L Hofmann
- Department of Pharmaceutical Chemistry, Cardiovascular Research Institute, Quantitative Biosciences Institute, and Helen Diller Family Comprehensive Cancer Centre, University of California San Francisco CA USA
| | - Balyn W Zaro
- Department of Pharmaceutical Chemistry, Cardiovascular Research Institute, Quantitative Biosciences Institute, and Helen Diller Family Comprehensive Cancer Centre, University of California San Francisco CA USA
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5
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Cloutier M, Fortin JS, Thibodeau J. The transmembrane domain and luminal C-terminal region independently support invariant chain trimerization and assembly with MHCII into nonamers. BMC Immunol 2021; 22:56. [PMID: 34384367 PMCID: PMC8362237 DOI: 10.1186/s12865-021-00444-6] [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: 08/25/2020] [Accepted: 07/20/2021] [Indexed: 05/31/2023] Open
Abstract
Background Invariant chain (CD74, Ii) is a multifunctional protein expressed in antigen presenting cells. It assists the ER exit of various cargos and serves as a receptor for the macrophage migration inhibitory factor. The newly translated Ii chains trimerize, a structural feature that is not readily understood in the context of its MHCII chaperoning function. Two segments of Ii, the luminal C-terminal region (TRIM) and the transmembrane domain (TM), have been shown to participate in the trimerization process but their relative importance and impact on the assembly with MHCII molecules remains debated. Here, we addressed the requirement of these domains in the trimerization of human Ii as well as in the oligomerization with MHCII molecules. We used site-directed mutagenesis to generate series of Ii and DR mutants. These were transiently transfected in HEK293T cells to test their cell surface expression and analyse their interactions by co-immunoprecipitations. Results Our results showed that the TRIM domain is not essential for Ii trimerization nor for intracellular trafficking with MHCII molecules. We also gathered evidence that in the absence of TM, TRIM allows the formation of multi-subunit complexes with HLA-DR. Similarly, in the absence of TRIM, Ii can assemble into high-order structures with MHCII molecules. Conclusions Altogether, our data show that trimerization of Ii through either TM or TRIM sustains nonameric complex formation with MHCII molecules. Supplementary Information The online version contains supplementary material available at 10.1186/s12865-021-00444-6.
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Affiliation(s)
- Maryse Cloutier
- Laboratoire d'Immunologie Moléculaire, Département de Microbiologie, Infectiologie et Immunologie, Faculté de Médecine, Université de Montréal, Succ Centre-Ville, CP 6128, Montréal, QC, H3C 3J7, Canada
| | - Jean-Simon Fortin
- Laboratoire d'Immunologie Moléculaire, Département de Microbiologie, Infectiologie et Immunologie, Faculté de Médecine, Université de Montréal, Succ Centre-Ville, CP 6128, Montréal, QC, H3C 3J7, Canada
| | - Jacques Thibodeau
- Laboratoire d'Immunologie Moléculaire, Département de Microbiologie, Infectiologie et Immunologie, Faculté de Médecine, Université de Montréal, Succ Centre-Ville, CP 6128, Montréal, QC, H3C 3J7, Canada.
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6
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Simakou T, Freeburn R, Henriquez FL. Gene expression during THP-1 differentiation is influenced by vitamin D3 and not vibrational mechanostimulation. PeerJ 2021; 9:e11773. [PMID: 34316406 PMCID: PMC8286059 DOI: 10.7717/peerj.11773] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2021] [Accepted: 06/23/2021] [Indexed: 11/20/2022] Open
Abstract
Background In injury or infection, monocytes migrate into the affected tissues from circulation and differentiate into macrophages which are subsequently involved in the inflammatory responses. Macrophage differentiation and activation have been studied in response to multiple chemokines and cytokines. However, mechanical, and physical stimuli can also influence macrophage differentiation, activation, cytokine production, and phagocytic activity. Methods In this study the macrophage differentiation from THP-1 monocytes was assessed upon the stimulation with 1,25-dihydroxyvitamin D3 and 1,000 Hz vibrations, using qPCR for quantification of transcript expression. Vitamin D binds the vitamin D receptor (VDR) and subsequently modulates the expression of a variety of genes in monocytes. The effects of the 1,000 Hz vibrational stimulation, and the combined treatment of vitamin D3 and 1000 Hz vibrations were unknown. The differentiation of macrophages was assessed by looking at transcription of macrophage markers (e.g., CD14, CD36), antigen presenting molecules (e.g., HLA-DRA), transcription factors (e.g., LEF-1, TCF7L2), and mechanosensors (e.g., PIEZO1 and PKD2). Results The results showed that vitamin D3 induced THP-1 macrophage differentiation, which was characterized by upregulation of CD14 and CD36, downregulation of HLA-DRA, upregulation of the PKD2 (TRPP2), and an inverse relationship between TCF7L2 and LEF-1, which were upregulated and downregulated respectively. The 1,000 Hz vibrations were sensed from the cells which upregulated PIEZO1 and TCF3, but they did not induce expression of genes that would indicate macrophage differentiation. The mRNA transcription profile in the cells stimulated with the combined treatment was comparable to that of the cells stimulated by the vitamin only. The 1,000 Hz vibrations slightly weakened the effect of the vitamin for the regulation of CD36 and HLA-DMB in the suspension cells, but without causing changes in the regulation patterns. The only exception was the upregulation of TCF3 in the suspension cells, which was influenced by the vibrations. In the adherent cells, the vitamin D3 cancelled the upregulating effect of the 1,000 Hz vibrations and downregulated TCF3. The vitamin also cancelled the upregulation of PIEZO1 gene by the 1,000 Hz vibrations in the combined treatment. Conclusion The mechanical stimulation with 1,000 Hz vibrations resulted in upregulation of PIEZO1 in THP-1 cells, but it did not affect the differentiation process which was investigated in this study. Vitamin D3 induced THP-1 macrophage differentiation and could potentially influence M2 polarization as observed by upregulation of CD36 and downregulation of HLA-DRA. In addition, in THP-1 cells undergoing the combined stimulation, the gene expression patterns were influenced by vitamin D3, which also ablated the effect of the mechanical stimulus on PIEZO1 upregulation.
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Affiliation(s)
- Theodoros Simakou
- School of Health and Life Sciences, University of West of Scotland, Paisley, United Kingdom.,Institute of Infection, Immunity and Inflammation, University of Glasgow, Glasgow, United Kingdom
| | - Robin Freeburn
- School of Health and Life Sciences, University of West of Scotland, Paisley, United Kingdom
| | - Fiona L Henriquez
- School of Health and Life Sciences, University of West of Scotland, Paisley, United Kingdom
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7
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Partnering for the major histocompatibility complex class II and antigenic determinant requires flexibility and chaperons. Curr Opin Immunol 2021; 70:112-121. [PMID: 34146954 DOI: 10.1016/j.coi.2021.05.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2021] [Accepted: 05/12/2021] [Indexed: 11/22/2022]
Abstract
Cytotoxic, or helper T cells recognize antigen via T cell receptors (TCRs) that can see their target antigen as short sequences of peptides bound to the groove of proteins of major histocompatibility complex (MHC) class I, and class II respectively. For MHC class II epitope selection from exogenous pathogens or self-antigens, participation of several accessory proteins, molecular chaperons, processing enzymes within multiple vesicular compartments is necessary. A major contributing factor is the MHC class II structure itself that uniquely offers a dynamic and flexible groove essential for epitope selection. In this review, I have taken a historical perspective focusing on the flexibility of the MHC II molecules as the driving force in determinant selection and interactions with the accessory molecules in antigen processing, HLA-DM and HLA-DO.
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8
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Demmers LC, Wu W, Heck AJR. HLA Class II Presentation Is Specifically Altered at Elevated Temperatures in the B-Lymphoblastic Cell Line JY. Mol Cell Proteomics 2021; 20:100089. [PMID: 33933681 PMCID: PMC8724904 DOI: 10.1016/j.mcpro.2021.100089] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2020] [Revised: 03/25/2021] [Accepted: 04/13/2021] [Indexed: 12/22/2022] Open
Abstract
Human leukocyte antigen (HLA) molecules play critical roles in our adaptive immune system by signaling a cell's health status to the immune system, through presentation of small peptides. Understanding HLA biology is important because of its prominent role in autoimmune diseases and cancer immunotherapy. Although both the HLA class I and class II antigen processing and presentation pathways have been studied extensively, the fundamental rules in HLA class II antigen presentation still remain less understood. To clarify the mechanistic and adaptive differences between the HLA systems, we challenged a B lymphoblastic cell line (JY), widely used as model system in studying antigen presentation, with a high temperature treatment to mimic a "fever-like state", representing one of the most common physiological responses to infection. In the absence of real invading pathogenic peptides to present, we could focus on delineating the intrinsic HLA pathway adaptations in response to high temperature in this particular cell line. Following a three-pronged approach, we performed quantitative analyses of the proteome, the HLA class I ligandome, as well as the HLA class II ligandome. The data reveals that elevated temperature may already prepare these cells for an immune-like response through increased HLA class II presentation capacity and specific release of, from the invariant chain originating, CLIP peptides. Interestingly, at high temperature, prominent changes in the composition of the CLIP repertoire were observed, with enrichment of peptides containing C-terminal extensions beyond the CLIP-core region. Collectively, these illustrate intriguing temperature sensitive adaptations in this B cell line.
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Affiliation(s)
- Laura C Demmers
- Biomolecular Mass Spectrometry and Proteomics, Bijvoet Center for Biomolecular Research and Utrecht Institute for Pharmaceutical Sciences, Utrecht University, Utrecht, Netherlands; Netherlands Proteomics Centre, Utrecht, Netherlands
| | - Wei Wu
- Biomolecular Mass Spectrometry and Proteomics, Bijvoet Center for Biomolecular Research and Utrecht Institute for Pharmaceutical Sciences, Utrecht University, Utrecht, Netherlands; Netherlands Proteomics Centre, Utrecht, Netherlands
| | - Albert J R Heck
- Biomolecular Mass Spectrometry and Proteomics, Bijvoet Center for Biomolecular Research and Utrecht Institute for Pharmaceutical Sciences, Utrecht University, Utrecht, Netherlands; Netherlands Proteomics Centre, Utrecht, Netherlands.
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9
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Graves AM, Virdis F, Morrison E, Álvaro-Benito M, Khan AA, Freund C, Golovkina TV, Denzin LK. Human Hepatitis B Viral Infection Outcomes Are Linked to Naturally Occurring Variants of HLA-DOA That Have Altered Function. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2020; 205:923-935. [PMID: 32690655 PMCID: PMC7415708 DOI: 10.4049/jimmunol.2000476] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2020] [Accepted: 06/11/2020] [Indexed: 12/21/2022]
Abstract
HLA molecules of the MHC class II (MHCII) bind and present pathogen-derived peptides for CD4 T cell activation. Peptide loading of MHCII in the endosomes of cells is controlled by the interplay of the nonclassical MHCII molecules, HLA-DM (DM) and HLA-DO (DO). DM catalyzes peptide loading, whereas DO, an MHCII substrate mimic, prevents DM from interacting with MHCII, resulting in an altered MHCII-peptide repertoire and increased MHCII-CLIP. Although the two genes encoding DO (DOA and DOB) are considered nonpolymorphic, there are rare natural variants. Our previous work identified DOB variants that altered DO function. In this study, we show that natural variation in the DOA gene also impacts DO function. Using the 1000 Genomes Project database, we show that ∼98% of individuals express the canonical DOA*0101 allele, and the remaining individuals mostly express DOA*0102, which we found was a gain-of-function allele. Analysis of 25 natural occurring DOα variants, which included the common alleles, identified three null variants and one variant with reduced and nine with increased ability to modulate DM activity. Unexpectedly, several of the variants produced reduced DO protein levels yet efficiently inhibited DM activity. Finally, analysis of associated single-nucleotide polymorphisms genetically linked the DOA*0102 common allele, a gain-of-function variant, with human hepatitis B viral persistence. In contrast, we found that the DOα F114L null allele was linked with viral clearance. Collectively, these studies show that natural variation occurring in the human DOA gene impacts DO function and can be linked to specific outcomes of viral infections.
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Affiliation(s)
- Austin M Graves
- Child Health Institute of New Jersey, Robert Wood Johnson Medical School, Rutgers, The State University of New Jersey, New Brunswick, NJ 08901
- Rutgers Graduate School of Biomedical Sciences, Piscataway, NJ 08854
| | - Francesca Virdis
- Child Health Institute of New Jersey, Robert Wood Johnson Medical School, Rutgers, The State University of New Jersey, New Brunswick, NJ 08901
| | - Eliot Morrison
- Laboratory of Protein Biochemistry, Department of Biology, Chemistry and Pharmacy, Free University of Berlin, 14195 Berlin, Germany
| | - Miguel Álvaro-Benito
- Laboratory of Protein Biochemistry, Department of Biology, Chemistry and Pharmacy, Free University of Berlin, 14195 Berlin, Germany
| | - Aly A Khan
- Department of Pathology, The University of Chicago, Chicago, IL 60637
| | - Christian Freund
- Laboratory of Protein Biochemistry, Department of Biology, Chemistry and Pharmacy, Free University of Berlin, 14195 Berlin, Germany
| | | | - Lisa K Denzin
- Child Health Institute of New Jersey, Robert Wood Johnson Medical School, Rutgers, The State University of New Jersey, New Brunswick, NJ 08901;
- Department of Pediatrics, Robert Wood Johnson Medical School, Rutgers, The State University of New Jersey, New Brunswick, NJ 08901; and
- Department of Pharmacology, Robert Wood Johnson Medical School, Rutgers, The State University of New Jersey, New Brunswick, NJ 08901
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10
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Hofmann BB, Krapp N, Li Y, De La Torre C, Sol M, Braun JD, Kolibabka M, Pallavi P, Krämer BK, Yard BA, Kälsch AI. N-Octanoyl-Dopamine inhibits cytokine production in activated T-cells and diminishes MHC-class-II expression as well as adhesion molecules in IFNγ-stimulated endothelial cells. Sci Rep 2019; 9:19338. [PMID: 31853095 PMCID: PMC6920350 DOI: 10.1038/s41598-019-55983-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2019] [Accepted: 11/29/2019] [Indexed: 01/06/2023] Open
Abstract
IFNγ enhances allograft immunogenicity and facilitates T-cell mediated rejection. This may cause interstitial fibrosis and tubular atrophy (IFTA), contributing to chronic allograft loss. We assessed if inhibition of T-cell activation by N-octanoyl dopamine (NOD) impairs adherence of activated T-cells to endothelial cells and the ability of activated T-cells to produce IFNγ. We also assessed if NOD affects IFNγ mediated gene expression in endothelial cells. The presence of NOD during T-cell activation significantly blunted their adhesion to unstimulated and cytokine stimulated HUVEC. Supernatants of these T-cells displayed significantly lower concentrations of TNFα and IFNγ and were less capable to facilitate T-cell adhesion. In the presence of NOD VLA-4 (CD49d/CD29) and LFA-1 (CD11a/CD18) expression on T-cells was reduced. NOD treatment of IFNγ stimulated HUVEC reduced the expression of MHC class II transactivator (CIITA), of MHC class II and its associated invariant chain CD74. Since IFTA is associated with T-cell mediated rejection and IFNγ to a large extent regulates immunogenicity of allografts, our current data suggest a potential clinical use of NOD in the treatment of transplant recipients. Further in vivo studies are warranted to confirm these in vitro findings and to assess the benefit of NOD on IFTA in clinically relevant models.
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Affiliation(s)
- Björn B Hofmann
- Department of Nephrology, Endocrinology and Rheumatology, Fifth Department of Medicine, Medical Faculty Mannheim, University of Heidelberg, Mannheim, Germany
| | - Nicolas Krapp
- Department of Nephrology, Endocrinology and Rheumatology, Fifth Department of Medicine, Medical Faculty Mannheim, University of Heidelberg, Mannheim, Germany
| | - Yingchun Li
- Department of Nephrology, Endocrinology and Rheumatology, Fifth Department of Medicine, Medical Faculty Mannheim, University of Heidelberg, Mannheim, Germany
| | - Carolina De La Torre
- Center of Medical Research, Medical Faculty Mannheim, University of Heidelberg, Mannheim, Germany
| | - Marloes Sol
- Department of Medical Biology and Pathology, University Medical Center Groningen, Groningen, Netherlands
| | - Jana D Braun
- Department of Nephrology, Endocrinology and Rheumatology, Fifth Department of Medicine, Medical Faculty Mannheim, University of Heidelberg, Mannheim, Germany
| | - Matthias Kolibabka
- Department of Nephrology, Endocrinology and Rheumatology, Fifth Department of Medicine, Medical Faculty Mannheim, University of Heidelberg, Mannheim, Germany
| | - Prama Pallavi
- Department of Nephrology, Endocrinology and Rheumatology, Fifth Department of Medicine, Medical Faculty Mannheim, University of Heidelberg, Mannheim, Germany
| | - Bernhard K Krämer
- Department of Nephrology, Endocrinology and Rheumatology, Fifth Department of Medicine, Medical Faculty Mannheim, University of Heidelberg, Mannheim, Germany
| | - Benito A Yard
- Department of Nephrology, Endocrinology and Rheumatology, Fifth Department of Medicine, Medical Faculty Mannheim, University of Heidelberg, Mannheim, Germany.
| | - Anna-Isabelle Kälsch
- Department of Nephrology, Endocrinology and Rheumatology, Fifth Department of Medicine, Medical Faculty Mannheim, University of Heidelberg, Mannheim, Germany
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11
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Solanki KS, Gandham RK, Thomas P, Chaudhuri P. Transcriptome analysis of Brucella abortus S19∆ per immunized mouse spleen revealed activation of MHC-I and MHC-II pathways. Access Microbiol 2019; 2:acmi000082. [PMID: 33062939 PMCID: PMC7525051 DOI: 10.1099/acmi.0.000082] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2019] [Accepted: 10/23/2019] [Indexed: 12/24/2022] Open
Abstract
The mouse (Mus musculus) has been extensively used for studying brucellosis, regarding pathogenesis, immunity and the evaluation of vaccines and therapeutics. In this work, RNA-seq was applied to explore the immunological potential of a live Brucella abortus S19∆per, a perosamine synthetase gene mutant of B. abortus S19. Comparison of transcriptome data was carried out for identifying differentially expressed genes among PBS (control) and B. abortus S19∆per immunized mice at 15 days post-immunization. Functional analysis revealed 545 significant differentially expressed genes related to mouse immunity. Specific activation of MHC-I and MHC-II antigen-processing pathways were identified as the highly enriched pathways based on Kyoto Encyclopedia of Genes and Genomes annotation. Other major immune response pathways regulated within the host were NF-kappa B signalling, chemokine signalling, T-cell receptor pathway, apoptosis, TNF signalling and nucleotide-binding oligomerization domain-like receptor signalling. These data provided new insights into the molecular mechanisms of B. abortus S19∆per-induced immune response in mice spleen that might facilitate the development of a highly immunogenic vaccine against brucellosis.
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Affiliation(s)
- Khushal Singh Solanki
- Division of Veterinary Biotechnology, ICAR-Indian Veterinary Research Institute, Izatnagar, Bareilly, Uttar Pradesh, 243122, India
| | - Ravi Kumar Gandham
- Division of Veterinary Biotechnology, ICAR-Indian Veterinary Research Institute, Izatnagar, Bareilly, Uttar Pradesh, 243122, India.,National Institute of Animal Biotechnology, Opp. Journalist Colony, Near Gowlidoddy Extended, Q City Road, Gachibowli, Hyderabad, Telangana 500032, India
| | - Prasad Thomas
- Division of Bacteriology and Mycology, ICAR-Indian Veterinary Research Institute, Izatnagar, Bareilly, Uttar Pradesh, 243122, India
| | - Pallab Chaudhuri
- Division of Bacteriology and Mycology, ICAR-Indian Veterinary Research Institute, Izatnagar, Bareilly, Uttar Pradesh, 243122, India
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12
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Freund C, Höfer T. A Missing Switch in Peptide Exchange for MHC Class II Molecules. Front Immunol 2019; 10:2513. [PMID: 31708929 PMCID: PMC6820466 DOI: 10.3389/fimmu.2019.02513] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2019] [Accepted: 10/08/2019] [Indexed: 11/21/2022] Open
Affiliation(s)
- Christian Freund
- Laboratory of Protein Biochemistry, Institute for Chemistry and Biochemistry, Freie Universität Berlin, Berlin, Germany
| | - Thomas Höfer
- Division of Theoretical Systems Biology, Deutsches Krebsforschungszentrum, Heidelberg, Germany
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13
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Abelin JG, Harjanto D, Malloy M, Suri P, Colson T, Goulding SP, Creech AL, Serrano LR, Nasir G, Nasrullah Y, McGann CD, Velez D, Ting YS, Poran A, Rothenberg DA, Chhangawala S, Rubinsteyn A, Hammerbacher J, Gaynor RB, Fritsch EF, Greshock J, Oslund RC, Barthelme D, Addona TA, Arieta CM, Rooney MS. Defining HLA-II Ligand Processing and Binding Rules with Mass Spectrometry Enhances Cancer Epitope Prediction. Immunity 2019; 51:766-779.e17. [PMID: 31495665 DOI: 10.1016/j.immuni.2019.08.012] [Citation(s) in RCA: 153] [Impact Index Per Article: 30.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2019] [Revised: 06/19/2019] [Accepted: 08/15/2019] [Indexed: 12/30/2022]
Abstract
Increasing evidence indicates CD4+ T cells can recognize cancer-specific antigens and control tumor growth. However, it remains difficult to predict the antigens that will be presented by human leukocyte antigen class II molecules (HLA-II), hindering efforts to optimally target them therapeutically. Obstacles include inaccurate peptide-binding prediction and unsolved complexities of the HLA-II pathway. To address these challenges, we developed an improved technology for discovering HLA-II binding motifs and conducted a comprehensive analysis of tumor ligandomes to learn processing rules relevant in the tumor microenvironment. We profiled >40 HLA-II alleles and showed that binding motifs were highly sensitive to HLA-DM, a peptide-loading chaperone. We also revealed that intratumoral HLA-II presentation was dominated by professional antigen-presenting cells (APCs) rather than cancer cells. Integrating these observations, we developed algorithms that accurately predicted APC ligandomes, including peptides from phagocytosed cancer cells. These tools and biological insights will enable improved HLA-II-directed cancer therapies.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | | | | | - Asaf Poran
- Neon Therapeutics, Cambridge, MA 02139, USA
| | | | | | - Alex Rubinsteyn
- Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Jeff Hammerbacher
- Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
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14
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Ming Q, Gonzalez-Perez D, Luca VC. Molecular engineering strategies for visualizing low-affinity protein complexes. Exp Biol Med (Maywood) 2019; 244:1559-1567. [PMID: 31184923 DOI: 10.1177/1535370219855401] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
The growing availability of complex structures in the Protein Data Bank has provided key insight into the molecular architecture of protein–protein interfaces. The remarkable diversity observed in protein binding modes is paralleled by a tremendous variation in binding affinities, with interaction half-lives ranging from days to milliseconds. Within the protein interactome, low-affinity binding events have been particularly difficult to visualize by traditional structural methods, which has spurred the development of innovative strategies for reconstituting these short-lived yet biologically essential assemblies. An important takeaway from structural studies of low-affinity systems is that there is no universal solution for stabilizing protein complexes, and approaches such as single-chain fusions, biochemical linkages, and affinity-maturation have each been successful in certain contexts. In this article, we review how advances in molecular engineering have been used to capture weakly associated complexes for structure determination, and we provide perspectives on how the continued application of these methods can shed new light on the “hidden world” of low-affinity interactions. Impact statement Low-affinity protein interactions, while biologically essential, have been difficult to visualize by traditional methods in structural biology. In this review, we describe a series of innovative molecular engineering strategies that have been used to stabilize weakly bound protein complexes for structure determination. By highlighting several examples from the literature along with potential advantages and disadvantages of the individual approaches, we hope to provide an introductory resource for structural biologists studying low-affinity systems.
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Affiliation(s)
- Qianqian Ming
- Department of Drug Discovery, Moffitt Cancer Center and Research Institute, Tampa, FL 33612, USA
| | - David Gonzalez-Perez
- Department of Drug Discovery, Moffitt Cancer Center and Research Institute, Tampa, FL 33612, USA
| | - Vincent C Luca
- Department of Drug Discovery, Moffitt Cancer Center and Research Institute, Tampa, FL 33612, USA
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15
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Purcell AW, Ramarathinam SH, Ternette N. Mass spectrometry-based identification of MHC-bound peptides for immunopeptidomics. Nat Protoc 2019; 14:1687-1707. [PMID: 31092913 DOI: 10.1038/s41596-019-0133-y] [Citation(s) in RCA: 190] [Impact Index Per Article: 38.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2016] [Accepted: 01/08/2019] [Indexed: 01/13/2023]
Abstract
Peptide antigens bound to molecules encoded by the major histocompatibility complex (MHC) and presented on the cell surface form the targets of T lymphocytes. This critical arm of the adaptive immune system facilitates the eradication of pathogen-infected and cancerous cells, as well as the production of antibodies. Methods to identify these peptide antigens are critical to the development of new vaccines, for which the goal is the generation of effective adaptive immune responses and long-lasting immune memory. Here, we describe a robust protocol for the identification of MHC-bound peptides from cell lines and tissues, using nano-ultra-performance liquid chromatography coupled to high-resolution mass spectrometry (nUPLC-MS/MS) and recent improvements in methods for isolation and characterization of these peptides. The protocol starts with the immunoaffinity capture of naturally processed MHC-peptide complexes. The peptides dissociate from the class I human leukocyte antigens (HLAs) upon acid denaturation. This peptide cargo is then extracted and separated into fractions by HPLC, and the peptides in these fractions are identified using nUPLC-MS/MS. With this protocol, several thousand peptides can be identified from a wide variety of cell types, including cancerous and infected cells and those from tissues, with a turnaround time of 2-3 d.
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Affiliation(s)
- Anthony W Purcell
- Department of Biochemistry and Molecular Biology, Infection and Immunity Program, Biomedicine Discovery Institute, Monash University, Clayton, VIC, Australia.
| | - Sri H Ramarathinam
- Department of Biochemistry and Molecular Biology, Infection and Immunity Program, Biomedicine Discovery Institute, Monash University, Clayton, VIC, Australia
| | - Nicola Ternette
- The Jenner Institute, Mass Spectrometry Laboratory, Target Discovery Institute, University of Oxford, Oxford, UK.
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16
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Welsh R, Song N, Sadegh-Nasseri S. What to do with HLA-DO/H-2O two decades later? Immunogenetics 2019; 71:189-196. [PMID: 30683973 PMCID: PMC6377320 DOI: 10.1007/s00251-018-01097-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2018] [Accepted: 11/20/2018] [Indexed: 10/27/2022]
Abstract
The main objective of antigen processing is to orchestrate the selection of immunodominant epitopes for recognition by CD4 T cells. To achieve this, MHC class II molecules have evolved with a flexible peptide-binding groove in need of a bound peptide. Newly synthesized MHC-II molecules bind a class II invariant chain (Ii) upon synthesis and are shuttled to a specialized compartment, where they encounter exogenous antigens. Ii serves multiple functions, one of which is to maintain the shape of the MHC-II groove so that it can readily bind exogenous antigens upon dissociation of the Ii peptide in MHC- II compartment. MIIC contains processing enzymes, one or both accessory molecules, HLA-DM/H2-M (DM) and HLA-DO/H2-O (DO), and optimal denaturing conditions. In a process known as "editing," DM facilitates the dissociation of the invariant chain peptide, CLIP, for exchange with exogenous antigens. Despite the availability of mechanistic insights into DM functions, understanding how DO contributes to epitope selection has proven to be more challenging. The current dogma assumes that DO inhibits DM, whereas an opposing model suggests that DO fine-tunes the epitope selection process. Understanding which of these, or potentially other models of DO function is important, as DO variants have been linked to autoimmunity, cancer, and the generation of broadly neutralizing antibodies to viruses. This review therefore attempts to evaluate experimental evidence in support of these hypotheses, with an emphasis on the less discussed model, and to explore intriguing questions about the importance of DO in biology.
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Affiliation(s)
- Robin Welsh
- Graduate Program in Immunology and Department of Pathology, Johns Hopkins University, Baltimore, MD, USA
| | - Nianbin Song
- Graduate Program in Immunology and Department of Pathology, Johns Hopkins University, Baltimore, MD, USA
| | - Scheherazade Sadegh-Nasseri
- Graduate Program in Immunology and Department of Pathology, Johns Hopkins University, Baltimore, MD, USA.
- Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, MD, 21205, USA.
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17
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A personal retrospective on the mechanisms of antigen processing. Immunogenetics 2019; 71:141-160. [PMID: 30694344 DOI: 10.1007/s00251-018-01098-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2018] [Accepted: 11/22/2018] [Indexed: 10/27/2022]
Abstract
My intention here is to describe the history of the molecular aspects of the antigen processing field from a personal perspective, beginning with the early identification of the species that we now know as MHC class I and MHC class II molecules, to the recognition that their stable surface expression and detection by T cells depends on peptide association, and to the unraveling of the biochemical and cell biological mechanisms that regulate peptide binding. One goal is to highlight the role that serendipity or, more colloquially, pure blind luck can play in advancing the research enterprise when it is combined with an appropriately receptive mind. This is not intended to be an overarching review, and because of my own work I focus primarily on studies of the human MHC. This means that I neglect the work of many other individuals who made advances in other species, particularly those who produced the many knockout mouse strains used to demonstrate the importance of the antigen processing machinery for initiating immune responses. I apologize in advance to colleagues around the globe whose contributions I deal with inadequately for these reasons, and to those whose foundational work is now firmly established in text books and therefore not cited. So many individuals have worked to advance the field that giving all of them the credit they deserve is almost impossible. I have attempted, while focusing on work from my own laboratory, to point out contemporaneous or sometimes earlier advances made by others. Much of the success of my own laboratory came because we simultaneously worked on both the MHC class I and class II systems and used the findings in one area to inform the other, but mainly it depended on the extraordinary group of students and fellows who have worked on these projects over the years. To those who worked in other areas who are not mentioned here, rest assured that I appreciate your efforts just as much.
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18
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Jiang J, Natarajan K, Margulies DH. MHC Molecules, T cell Receptors, Natural Killer Cell Receptors, and Viral Immunoevasins-Key Elements of Adaptive and Innate Immunity. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2019; 1172:21-62. [PMID: 31628650 DOI: 10.1007/978-981-13-9367-9_2] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Molecules encoded by the Major Histocompatibility Complex (MHC) bind self or foreign peptides and display these at the cell surface for recognition by receptors on T lymphocytes (designated T cell receptors-TCR) or on natural killer (NK) cells. These ligand/receptor interactions govern T cell and NK cell development as well as activation of T memory and effector cells. Such cells participate in immunological processes that regulate immunity to various pathogens, resistance and susceptibility to cancer, and autoimmunity. The past few decades have witnessed the accumulation of a huge knowledge base of the molecular structures of MHC molecules bound to numerous peptides, of TCRs with specificity for many different peptide/MHC (pMHC) complexes, of NK cell receptors (NKR), of MHC-like viral immunoevasins, and of pMHC/TCR and pMHC/NKR complexes. This chapter reviews the structural principles that govern peptide/MHC (pMHC), pMHC/TCR, and pMHC/NKR interactions, for both MHC class I (MHC-I) and MHC class II (MHC-II) molecules. In addition, we discuss the structures of several representative MHC-like molecules. These include host molecules that have distinct biological functions, as well as virus-encoded molecules that contribute to the evasion of the immune response.
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Affiliation(s)
- Jiansheng Jiang
- Molecular Biology Section, Laboratory of Immune System Biology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bldg. 10, Room 11D07, 10 Center Drive, Bethesda, MD, 20892-1892, USA.
| | - Kannan Natarajan
- Molecular Biology Section, Laboratory of Immune System Biology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bldg. 10, Room 11D07, 10 Center Drive, Bethesda, MD, 20892-1892, USA
| | - David H Margulies
- Molecular Biology Section, Laboratory of Immune System Biology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bldg. 10, Room 11D12, 10 Center Drive, Bethesda, MD, 20892-1892, USA
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19
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Thibodeau J, Moulefera MA, Balthazard R. On the structure–function of MHC class II molecules and how single amino acid polymorphisms could alter intracellular trafficking. Hum Immunol 2019; 80:15-31. [DOI: 10.1016/j.humimm.2018.10.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2018] [Revised: 09/25/2018] [Accepted: 10/01/2018] [Indexed: 12/01/2022]
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20
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Sadegh-Nasseri S, Kim A. Selection of immunodominant epitopes during antigen processing is hierarchical. Mol Immunol 2018; 113:115-119. [PMID: 30146122 DOI: 10.1016/j.molimm.2018.08.011] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2018] [Revised: 08/07/2018] [Accepted: 08/08/2018] [Indexed: 12/19/2022]
Abstract
MHC II proteins present processed antigens to CD4 + T cells through a complex set of events and players that include chaperons and accessory molecules. Antigen processing machinery is optimized for the selection of the best fitting peptides, called 'immunodominant epitopes', in the MHC II groove to which, specific CD4 + T cells respond and differentiate into memory T cells. However, due to the complexity of antigen processing, understanding the parameters that lead to immunodominance has proved difficult. Moreover, immunodominance of epitopes vary, depending on multiple factors that include; simultaneous processing of multiple proteins, involvement of multiple alleles of MHC II that can bind to the same antigen, or competition among several suitable epitopes on a single protein antigen. The current dogma assumes that once an antigenic determinant is selected under a specific condition, it would emerge immunodominant wherever it is placed. Here we will discuss some established parameters that contribute to immunodominance as well as some new findings, which demonstrate that slight changes to antigen structure can cause a complete shift in epitope selection during antigen processing and distort the natural immunodominant epitope.
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Affiliation(s)
| | - AeRyon Kim
- Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
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21
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Alvaro-Benito M, Morrison E, Wieczorek M, Sticht J, Freund C. Human leukocyte Antigen-DM polymorphisms in autoimmune diseases. Open Biol 2017; 6:rsob.160165. [PMID: 27534821 PMCID: PMC5008016 DOI: 10.1098/rsob.160165] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2016] [Accepted: 07/19/2016] [Indexed: 12/20/2022] Open
Abstract
Classical MHC class II (MHCII) proteins present peptides for CD4+ T-cell surveillance and are by far the most prominent risk factor for a number of autoimmune disorders. To date, many studies have shown that this link between particular MHCII alleles and disease depends on the MHCII's particular ability to bind and present certain peptides in specific physiological contexts. However, less attention has been paid to the non-classical MHCII molecule human leucocyte antigen-DM, which catalyses peptide exchange on classical MHCII proteins acting as a peptide editor. DM function impacts the presentation of both antigenic peptides in the periphery and key self-peptides during T-cell development in the thymus. In this way, DM activity directly influences the response to pathogens, as well as mechanisms of self-tolerance acquisition. While decreased DM editing of particular MHCII proteins has been proposed to be related to autoimmune disorders, no experimental evidence for different DM catalytic properties had been reported until recently. Biochemical and structural investigations, together with new animal models of loss of DM activity, have provided an attractive foundation for identifying different catalytic efficiencies for DM allotypes. Here, we revisit the current knowledge of DM function and discuss how DM function may impart autoimmunity at the organism level.
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Affiliation(s)
- Miguel Alvaro-Benito
- Protein Biochemistry Group, Institute for Chemistry and Biochemistry, Department of Biology, Chemistry and Pharmacy, Freie Universität Berlin, Berlin, Germany
| | - Eliot Morrison
- Protein Biochemistry Group, Institute for Chemistry and Biochemistry, Department of Biology, Chemistry and Pharmacy, Freie Universität Berlin, Berlin, Germany
| | - Marek Wieczorek
- Protein Biochemistry Group, Institute for Chemistry and Biochemistry, Department of Biology, Chemistry and Pharmacy, Freie Universität Berlin, Berlin, Germany
| | - Jana Sticht
- Protein Biochemistry Group, Institute for Chemistry and Biochemistry, Department of Biology, Chemistry and Pharmacy, Freie Universität Berlin, Berlin, Germany
| | - Christian Freund
- Protein Biochemistry Group, Institute for Chemistry and Biochemistry, Department of Biology, Chemistry and Pharmacy, Freie Universität Berlin, Berlin, Germany
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22
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Afridi S, Hoessli DC, Hameed MW. Mechanistic understanding and significance of small peptides interaction with MHC class II molecules for therapeutic applications. Immunol Rev 2017; 272:151-68. [PMID: 27319349 DOI: 10.1111/imr.12435] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Major histocompatibility complex (MHC) class II molecules are expressed by antigen-presenting cells and stimulate CD4(+) T cells, which initiate humoral immune responses. Over the past decade, interest has developed to therapeutically impact the peptides to be exposed to CD4(+) T cells. Structurally diverse small molecules have been discovered that act on the endogenous peptide exchanger HLA-DM by different mechanisms. Exogenously delivered peptides are highly susceptible to proteolytic cleavage in vivo; however, it is only when successfully incorporated into stable MHC II-peptide complexes that these peptides can induce an immune response. Many of the small molecules so far discovered have highlighted the molecular interactions mediating the formation of MHC II-peptide complexes. As potential drugs, these small molecules open new therapeutic approaches to modulate MHC II antigen presentation pathways and influence the quality and specificity of immune responses. This review briefly introduces how CD4(+) T cells recognize antigen when displayed by MHC class II molecules, as well as MHC class II-peptide-loading pathways, structural basis of peptide binding and stabilization of the peptide-MHC complexes. We discuss the concept of MHC-loading enhancers, how they could modulate immune responses and how these molecules have been identified. Finally, we suggest mechanisms whereby MHC-loading enhancers could act upon MHC class II molecules.
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Affiliation(s)
- Saifullah Afridi
- Dr. Panjwani Center for Molecular Medicine and Drug Research, International Center for Chemical and Biological Sciences, University of Karachi, Karachi, Pakistan
| | - Daniel C Hoessli
- Dr. Panjwani Center for Molecular Medicine and Drug Research, International Center for Chemical and Biological Sciences, University of Karachi, Karachi, Pakistan
| | - Muhammad Waqar Hameed
- Dr. Panjwani Center for Molecular Medicine and Drug Research, International Center for Chemical and Biological Sciences, University of Karachi, Karachi, Pakistan
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23
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Abstract
Unlike B cells, CD8-positive and CD4-positive T cells of the adaptive immune system do not recognize intact foreign proteins but instead recognize polypeptide fragments of potential antigens. These antigenic peptides are expressed on the surface of antigen presenting cells bound to MHC class I and MHC class II proteins. Here, we review the basics of antigen acquisition by antigen presenting cells, antigen proteolysis into polypeptide fragments, antigenic peptide binding to MHC proteins, and surface display of both MHC class I-peptide and MHC class II-peptide complexes.
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24
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Nguyen TB, Jayaraman P, Bergseng E, Madhusudhan MS, Kim CY, Sollid LM. Unraveling the structural basis for the unusually rich association of human leukocyte antigen DQ2.5 with class-II-associated invariant chain peptides. J Biol Chem 2017; 292:9218-9228. [PMID: 28364043 DOI: 10.1074/jbc.m117.785139] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2017] [Revised: 03/28/2017] [Indexed: 11/06/2022] Open
Abstract
Human leukocyte antigen (HLA)-DQ2.5 (DQA1*05/DQB1*02) is a class-II major histocompatibility complex protein associated with both type 1 diabetes and celiac disease. One unusual feature of DQ2.5 is its high class-II-associated invariant chain peptide (CLIP) content. Moreover, HLA-DQ2.5 preferentially binds the non-canonical CLIP2 over the canonical CLIP1. To better understand the structural basis of HLA-DQ2.5's unusual CLIP association characteristics, better insight into the HLA-DQ2.5·CLIP complex structures is required. To this end, we determined the X-ray crystal structure of the HLA-DQ2.5· CLIP1 and HLA-DQ2.5·CLIP2 complexes at 2.73 and 2.20 Å, respectively. We found that HLA-DQ2.5 has an unusually large P4 pocket and a positively charged peptide-binding groove that together promote preferential binding of CLIP2 over CLIP1. An α9-α22-α24-α31-β86-β90 hydrogen bond network located at the bottom of the peptide-binding groove, spanning from the P1 to P4 pockets, renders the residues in this region relatively immobile. This hydrogen bond network, along with a deletion mutation at α53, may lead to HLA-DM insensitivity in HLA-DQ2.5. A molecular dynamics simulation experiment reported here and recent biochemical studies by others support this hypothesis. The diminished HLA-DM sensitivity is the likely reason for the CLIP-rich phenotype of HLA-DQ2.5.
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Affiliation(s)
- Thanh-Binh Nguyen
- the Bioinformatics Institute, Singapore 138671, Singapore.,the Department of Biological Sciences, National University of Singapore, Singapore 117543, Singapore
| | - Priya Jayaraman
- the Department of Biological Sciences, National University of Singapore, Singapore 117543, Singapore
| | - Elin Bergseng
- the Centre for Immune Regulation and Department of Immunology, University of Oslo and Oslo University Hospital, N-0372 Oslo, Norway
| | - M S Madhusudhan
- the Bioinformatics Institute, Singapore 138671, Singapore.,the Indian Institute of Science Education and Research, Pune 411008, India, and
| | - Chu-Young Kim
- From the Department of Chemistry and .,School of Pharmacy, University of Texas at El Paso, El Paso, Texas 79968.,Synthetic Biology for Clinical and Technological Innovation, Life Sciences Institute, National University of Singapore, 117456 Singapore, Singapore
| | - Ludvig M Sollid
- the Centre for Immune Regulation and Department of Immunology, University of Oslo and Oslo University Hospital, N-0372 Oslo, Norway
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25
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Pérez-Montesinos G, López-Ortega O, Piedra-Reyes J, Bonifaz LC, Moreno J. Dynamic Changes in the Intracellular Association of Selected Rab Small GTPases with MHC Class II and DM during Dendritic Cell Maturation. Front Immunol 2017; 8:340. [PMID: 28396666 PMCID: PMC5367080 DOI: 10.3389/fimmu.2017.00340] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2016] [Accepted: 03/09/2017] [Indexed: 01/13/2023] Open
Abstract
Antigen processing for presentation by major histocompatibility complex class II (MHCII) molecules requires the latter to travel through the endocytic pathway together with its chaperons: the invariant chain (Ii) and DM. Nevertheless, the nature of the compartments where MHCII molecules travel to acquire peptides lacks definition regarding molecules involved in intracellular vesicular trafficking, such as Rab small GTPases. We aimed to define which Rab proteins are present during the intracellular transport of MHCII, DM, and Ii through the endocytic pathway on their route to the cell surface during dendritic cell (DC) maturation. We examined, by means of three-color confocal microscopy, the association of MHCII, DM, and Ii with Rab5, Rab7, Rab9, and Rab11 during the maturation of bone marrow-derived or spleen DC in response to LPS as an inflammatory stimulus. Prior to the stage of immature DC, MHCII migrated from diffuse small cytoplasmic vesicles, predominantly Rab5+Rab7- and Rab5+Rab7+ into a pericentriolar Rab5+Rab7+Rab9+ cluster, with Rab11+ areas. As DC reached the mature phenotype, MHCII left the pericentriolar endocytic compartments toward the cell surface in Rab11+ and Rab9+Rab11+ vesicles. The invariant chain and MHCII transport pathways were not identical. DM and MHCII appeared to arrive to pericentriolar endocytic compartments of immature DC through partially different routes. The association of MHCII molecules with distinct Rab GTPases during DC maturation suggests that after leaving the biosynthetic pathway, MHCII sequentially traffic from typical early endosomes to multivesicular late endosomes to finally arrive at the cell surface in Rab11+ recycling-type endosomes. In immature DCs, DM encounters transiently MHCII in the Rab5+Rab7+Rab9+ compartments, to remain there in mature DC.
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Affiliation(s)
- Gibrán Pérez-Montesinos
- Research Unit on Autoimmune Diseases, Research Unit on Immunochemistry, Centro México Nacional Siglo XXI, IMSS, Instituto Mexicano del Seguro Social, Mexico City, Distrito Federal, Mexico
- Centro Dermatológico “Dr. Ladislao de la Pascua”, Secretaría de Salud del Distrito Federal, Mexico City, Distrito Federal, Mexico
| | - Orestes López-Ortega
- Hospital Juárez de México, Secretaría de Salud, Mexico City, Distrito Federal, Mexico
| | - Jessica Piedra-Reyes
- Hospital Juárez de México, Secretaría de Salud, Mexico City, Distrito Federal, Mexico
| | - Laura C. Bonifaz
- Research Unit on Autoimmune Diseases, Research Unit on Immunochemistry, Centro México Nacional Siglo XXI, IMSS, Instituto Mexicano del Seguro Social, Mexico City, Distrito Federal, Mexico
| | - José Moreno
- Research Unit on Autoimmune Diseases, Research Unit on Immunochemistry, Centro México Nacional Siglo XXI, IMSS, Instituto Mexicano del Seguro Social, Mexico City, Distrito Federal, Mexico
- Hospital Juárez de México, Secretaría de Salud, Mexico City, Distrito Federal, Mexico
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26
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Lau A, Singh V, Soualhine H, Hmama Z. Expression of Cathepsin S in BCG converts it into a pro-apoptotic and highly immunogenic strain. Vaccine 2017; 35:2060-2068. [PMID: 28318770 DOI: 10.1016/j.vaccine.2017.02.065] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2016] [Revised: 02/16/2017] [Accepted: 02/28/2017] [Indexed: 12/17/2022]
Abstract
BACKGROUND BCG vaccine, introduced almost 100years ago, is the only option to prevent TB disease. It effectively protects newborns from meningeal TB but fails to prevent adult pulmonary TB. TB kills 1.3million people annually in areas where BCG vaccination is widely practiced. Thus, more effective TB vaccines are urgently needed. Others and we have shown that BCG mimics features of virulent M. tuberculosis, in particular attenuation of essential macrophage functions such as phagosome maturation and antigen presentation. One of these studies revealed that defect in antigen presentation is largely due to down-regulation of the cysteine protease Cathepsin S (CatS), which prevents MHC II molecule maturation and proper antigen peptide loading. Recent studies also suggested a potential role for cysteine proteases in the regulation of apoptosis, a key cellular process used by the macrophage to (i) contain and process ingested bacteria and (ii) facilitate cross-talk antigen presentation between the macrophage and dendritic cells. METHOD To reverse the phenotype of vaccine-mediated macrophage attenuation, we engineered a novel BCG strain that expresses and secretes active CatS (rBCG-CatS) to examine its pro-apoptotic properties in vitro, and subsequently, immunogenicity in mice. RESULTS Transcriptomic profiling of macrophages infected with rBCG-CatS, but not BCG, revealed upregulation of key pro-apoptotic genes and downregulation of anti-apoptotic genes, which were further confirmed by RT-qPCR analyses of expression of selected genes. Macrophages infected with rBCG-CatS undergo apoptosis as indicated by increased levels of annexin V staining and intracellular caspase-3 cleavage. Consistent with these findings, mice vaccinated with rBCG-CatS showed increased antigen-specific CD4+ T-cell responses, as well as enhanced cytokine production and proliferation in CD4+ upon ex vivo re-stimulation. CONCLUSION Collectively, this study shows that a pro-apoptotic BCG strain alleviates adverse traits of the wild-type strain, resulting in a highly immunogenic TB vaccine.
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Affiliation(s)
- Alice Lau
- Division of Infectious Diseases, Department of Medicine and Vancouver Coastal Health Research Institute, University of British Columbia, Vancouver, BC V6H 3Z6, Canada
| | - Vijender Singh
- Division of Infectious Diseases, Department of Medicine and Vancouver Coastal Health Research Institute, University of British Columbia, Vancouver, BC V6H 3Z6, Canada
| | - Hafid Soualhine
- Division of Infectious Diseases, Department of Medicine and Vancouver Coastal Health Research Institute, University of British Columbia, Vancouver, BC V6H 3Z6, Canada
| | - Zakaria Hmama
- Division of Infectious Diseases, Department of Medicine and Vancouver Coastal Health Research Institute, University of British Columbia, Vancouver, BC V6H 3Z6, Canada.
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27
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Wieczorek M, Sticht J, Stolzenberg S, Günther S, Wehmeyer C, El Habre Z, Álvaro-Benito M, Noé F, Freund C. MHC class II complexes sample intermediate states along the peptide exchange pathway. Nat Commun 2016; 7:13224. [PMID: 27827392 PMCID: PMC5105163 DOI: 10.1038/ncomms13224] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2015] [Accepted: 09/13/2016] [Indexed: 01/07/2023] Open
Abstract
The presentation of peptide-MHCII complexes (pMHCIIs) for surveillance by T cells is a well-known immunological concept in vertebrates, yet the conformational dynamics of antigen exchange remain elusive. By combining NMR-detected H/D exchange with Markov modelling analysis of an aggregate of 275 microseconds molecular dynamics simulations, we reveal that a stable pMHCII spontaneously samples intermediate conformations relevant for peptide exchange. More specifically, we observe two major peptide exchange pathways: the kinetic stability of a pMHCII's ground state defines its propensity for intrinsic peptide exchange, while the population of a rare, intermediate conformation correlates with the propensity of the HLA-DM-catalysed pathway. Helix-destabilizing mutants designed based on our model shift the exchange behaviour towards the HLA-DM-catalysed pathway and further allow us to conceptualize how allelic variation can shape an individual's MHC restricted immune response. MHCII proteins bind and present both foreign and self-antigens to potentially activate CD4+ T cells via cognate T cell receptors (TCRs) during the adaptive immune response. Here, the authors combine NMR-detected H/D exchange with Markov modelling analysis to shed light on the dynamics of MHCII peptide exchange.
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Affiliation(s)
- Marek Wieczorek
- Protein Biochemistry, Institute for Chemistry and Biochemistry, Freie Universität Berlin, Thielallee 63, 14195 Berlin, Germany
| | - Jana Sticht
- Protein Biochemistry, Institute for Chemistry and Biochemistry, Freie Universität Berlin, Thielallee 63, 14195 Berlin, Germany
| | - Sebastian Stolzenberg
- Computational Molecular Biology group, Institute for Mathematics, Arnimallee 6, 14195 Berlin, Germany
| | - Sebastian Günther
- Protein Biochemistry, Institute for Chemistry and Biochemistry, Freie Universität Berlin, Thielallee 63, 14195 Berlin, Germany.,Institute of Human Virology, University of Maryland School of Medicine, 725 West Lombard Street, Baltimore, Maryland 21201, USA
| | - Christoph Wehmeyer
- Computational Molecular Biology group, Institute for Mathematics, Arnimallee 6, 14195 Berlin, Germany
| | - Zeina El Habre
- Protein Biochemistry, Institute for Chemistry and Biochemistry, Freie Universität Berlin, Thielallee 63, 14195 Berlin, Germany
| | - Miguel Álvaro-Benito
- Protein Biochemistry, Institute for Chemistry and Biochemistry, Freie Universität Berlin, Thielallee 63, 14195 Berlin, Germany
| | - Frank Noé
- Computational Molecular Biology group, Institute for Mathematics, Arnimallee 6, 14195 Berlin, Germany
| | - Christian Freund
- Protein Biochemistry, Institute for Chemistry and Biochemistry, Freie Universität Berlin, Thielallee 63, 14195 Berlin, Germany
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28
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Sadegh-Nasseri S. A step-by-step overview of the dynamic process of epitope selection by major histocompatibility complex class II for presentation to helper T cells. F1000Res 2016; 5. [PMID: 27347387 PMCID: PMC4902097 DOI: 10.12688/f1000research.7664.1] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 05/27/2016] [Indexed: 11/25/2022] Open
Abstract
T cell antigen receptors (TCRs) expressed on cytotoxic or helper T cells can only see their specific target antigen as short sequences of peptides bound to the groove of proteins of major histocompatibility complex (MHC) class I, and class II respectively. In addition to the many steps, several participating proteins, and multiple cellular compartments involved in the processing of antigens, the MHC structure, with its dynamic and flexible groove, has perfectly evolved as the underlying instrument for epitope selection. In this review, I have taken a step-by-step, and rather historical, view to describe antigen processing and determinant selection, as we understand it today, all based on decades of intense research by hundreds of laboratories.
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29
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Hermann C, Trowsdale J, Boyle LH. TAPBPR: a new player in the MHC class I presentation pathway. ACTA ACUST UNITED AC 2015; 85:155-66. [PMID: 25720504 DOI: 10.1111/tan.12538] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
In order to provide specificity for T cell responses against pathogens and tumours, major histocompatibility complex (MHC) class I molecules present high-affinity peptides at the cell surface to T cells. A key player for peptide loading is the MHC class I-dedicated chaperone tapasin. Recently we discovered a second MHC class I-dedicated chaperone, the tapasin-related protein TAPBPR. Here, we review the major steps in the MHC class I pathway and the TAPBPR data. We discuss the potential function of TAPBPR in the MHC class I pathway and the involvement of this previously uncharacterised protein in human health and disease.
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Affiliation(s)
- C Hermann
- Department of Pathology, University of Cambridge, Cambridge CB2 1QP, UK
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30
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Pantouris G, Syed MA, Fan C, Rajasekaran D, Cho TY, Rosenberg EM, Bucala R, Bhandari V, Lolis EJ. An Analysis of MIF Structural Features that Control Functional Activation of CD74. ACTA ACUST UNITED AC 2015; 22:1197-205. [PMID: 26364929 DOI: 10.1016/j.chembiol.2015.08.006] [Citation(s) in RCA: 65] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2015] [Revised: 07/19/2015] [Accepted: 08/10/2015] [Indexed: 12/22/2022]
Abstract
For more than 15 years, the tautomerase active site of macrophage migration inhibitory factor (MIF) and its catalytic residue Pro1 have been being targeted for the development of therapeutics that block activation of its cell surface receptor, CD74. Neither the biological role of the MIF catalytic site nor the mechanistic details of CD74 activation are well understood. The inherently unstable structure of CD74 remains the biggest obstacle in structural studies with MIF for understanding the basis of CD74 activation. Using a novel approach, we elucidate the mechanistic details that control activation of CD74 by MIF surface residues and identify structural parameters of inhibitors that reduce CD74 biological activation. We also find that N-terminal mutants located deep in the catalytic site affect surface residues immediately outside the catalytic site, which are responsible for reduction of CD74 activation.
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Affiliation(s)
- Georgios Pantouris
- Department of Pharmacology, Yale School of Medicine, New Haven, CT 06510, USA
| | - Mansoor Ali Syed
- Department of Pediatrics, Yale School of Medicine, New Haven, CT 06510, USA
| | - Chengpeng Fan
- Department of Pharmacology, Yale School of Medicine, New Haven, CT 06510, USA
| | - Deepa Rajasekaran
- Department of Pharmacology, Yale School of Medicine, New Haven, CT 06510, USA
| | - Thomas Yoonsang Cho
- Department of Pharmacology, Yale School of Medicine, New Haven, CT 06510, USA
| | - Eric M Rosenberg
- Department of Pharmacology, Yale School of Medicine, New Haven, CT 06510, USA
| | - Richard Bucala
- Internal Medicine, Yale School of Medicine, New Haven, CT 06510, USA; Yale Cancer Center, Yale School of Medicine, New Haven, CT 06510, USA
| | - Vineet Bhandari
- Department of Pediatrics, Yale School of Medicine, New Haven, CT 06510, USA
| | - Elias J Lolis
- Department of Pharmacology, Yale School of Medicine, New Haven, CT 06510, USA; Yale Cancer Center, Yale School of Medicine, New Haven, CT 06510, USA.
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31
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Yin L, Maben ZJ, Becerra A, Stern LJ. Evaluating the Role of HLA-DM in MHC Class II-Peptide Association Reactions. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2015; 195:706-16. [PMID: 26062997 PMCID: PMC4490944 DOI: 10.4049/jimmunol.1403190] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2014] [Accepted: 05/15/2015] [Indexed: 01/07/2023]
Abstract
Ag presentation by MHC class II (MHC II) molecules to CD4(+) T cells plays a key role in the regulation of the adaptive immune response. Loading of antigenic peptides onto MHC II is catalyzed by HLA-DM (DM), a nonclassical MHC II molecule. The mechanism of DM-facilitated peptide loading is an outstanding problem in the field of Ag presentation. In this study, we systemically explored possible kinetic mechanisms for DM-catalyzed peptide association by measuring real-time peptide association kinetics using fluorescence polarization assays and comparing the experimental data with numerically modeled peptide association reactions. We found that DM does not facilitate peptide association by stabilizing peptide-free MHC II against aggregation. Moreover, DM does not promote transition of an inactive peptide-averse conformation of MHC II to an active peptide-receptive conformation. Instead, DM forms an intermediate with MHC II that binds peptide with faster kinetics than MHC II in the absence of DM. In the absence of peptides, interaction of MHC II with DM leads to inactivation and formation of a peptide-averse form. This study provides novel insights into how DM efficiently catalyzes peptide loading during Ag presentation.
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Affiliation(s)
- Liusong Yin
- Department of Pathology, University of Massachusetts Medical School, Worcester, MA 01605; and
| | - Zachary J Maben
- Department of Pathology, University of Massachusetts Medical School, Worcester, MA 01605; and
| | - Aniuska Becerra
- Department of Pathology, University of Massachusetts Medical School, Worcester, MA 01605; and
| | - Lawrence J Stern
- Department of Pathology, University of Massachusetts Medical School, Worcester, MA 01605; and Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Worcester, MA 01605
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32
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Ferrante A, Templeton M, Hoffman M, Castellini MJ. The Thermodynamic Mechanism of Peptide-MHC Class II Complex Formation Is a Determinant of Susceptibility to HLA-DM. THE JOURNAL OF IMMUNOLOGY 2015; 195:1251-61. [PMID: 26116504 DOI: 10.4049/jimmunol.1402367] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2014] [Accepted: 05/28/2015] [Indexed: 11/19/2022]
Abstract
Peptides bind MHC class II molecules through a thermodynamically nonadditive process consequent to the flexibility of the reactants. Currently, how the specific outcome of this binding process affects the ensuing epitope selection needs resolution. Calorimetric assessment of binding thermodynamics for hemagglutinin 306-319 peptide variants to the human MHC class II HLA-DR1 (DR1) and a mutant DR1 reveals that peptide/DR1 complexes can be formed with different enthalpic and entropic contributions. Complexes formed with a smaller entropic penalty feature circular dichroism spectra consistent with a non-compact form, and molecular dynamics simulation shows a more flexible structure. The opposite binding mode, compact and less flexible, is associated with greater entropic penalty. These structural variations are associated with rearrangements of residues known to be involved in HLA-DR (DM) binding, affinity of DM for the complex, and complex susceptibility to DM-mediated peptide exchange. Thus, the thermodynamic mechanism of peptide binding to DR1 correlates with the structural rigidity of the complex, and DM mediates peptide exchange by "sensing" flexible complexes in which the aforementioned residues are rearranged at a higher frequency than in more rigid ones.
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Affiliation(s)
- Andrea Ferrante
- Institute of Arctic Biology, University of Alaska Fairbanks, Fairbanks, AK 99775;
| | - Megan Templeton
- Institute of Arctic Biology, University of Alaska Fairbanks, Fairbanks, AK 99775; Department of Chemistry and Biochemistry, University of Alaska Fairbanks, Fairbanks, AK 99775; and
| | - Megan Hoffman
- Department of Veterinary Medicine, University of Alaska Fairbanks, Fairbanks, AK 99775
| | - Margaret J Castellini
- Department of Veterinary Medicine, University of Alaska Fairbanks, Fairbanks, AK 99775
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33
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Riedhammer C, Weissert R. Antigen Presentation, Autoantigens, and Immune Regulation in Multiple Sclerosis and Other Autoimmune Diseases. Front Immunol 2015; 6:322. [PMID: 26136751 PMCID: PMC4470263 DOI: 10.3389/fimmu.2015.00322] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2015] [Accepted: 06/03/2015] [Indexed: 12/12/2022] Open
Abstract
Antigen presentation is in the center of the immune system, both in host defense against pathogens, but also when the system is unbalanced and autoimmune diseases like multiple sclerosis (MS) develop. It is not just by chance that a major histocompatibility complex gene is the major genetic susceptibility locus in MS; a feature that MS shares with other autoimmune diseases. The exact etiology of the disease, however, has not been fully understood yet. T cells are regarded as the major players in the disease, but most probably a complex interplay of altered central and peripheral tolerance mechanisms, T-cell and B-cell functions, characteristics of putative autoantigens, and a possible interference of environmental factors like microorganisms are at work. In this review, new data on all these different aspects of antigen presentation and their role in MS will be discussed, probable autoantigens will be summarized, and comparisons to other autoimmune diseases will be drawn.
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Affiliation(s)
- Christine Riedhammer
- Neuroimmunology, Department of Neurology, University of Regensburg , Regensburg , Germany
| | - Robert Weissert
- Neuroimmunology, Department of Neurology, University of Regensburg , Regensburg , Germany
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34
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Haag S, Tuncel J, Thordardottir S, Mason DE, Yau ACY, Dobritzsch D, Bäcklund J, Peters EC, Holmdahl R. Positional identification of RT1-B (HLA-DQ) as susceptibility locus for autoimmune arthritis. THE JOURNAL OF IMMUNOLOGY 2015; 194:2539-50. [PMID: 25672758 DOI: 10.4049/jimmunol.1402238] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Rheumatoid arthritis (RA) is associated with amino acid variants in multiple MHC molecules. The association to MHC class II (MHC-II) has been studied in several animal models of RA. In most cases these models depend on T cells restricted to a single immunodominant peptide of the immunizing Ag, which does not resemble the autoreactive T cells in RA. An exception is pristane-induced arthritis (PIA) in the rat where polyclonal T cells induce chronic arthritis after being primed against endogenous Ags. In this study, we used a mixed genetic and functional approach to show that RT1-Ba and RT1-Bb (RT1-B locus), the rat orthologs of HLA-DQA and HLA-DQB, determine the onset and severity of PIA. We isolated a 0.2-Mb interval within the MHC-II locus of three MHC-congenic strains, of which two were protected from severe PIA. Comparison of sequence and expression variation, as well as in vivo blocking of RT1-B and RT1-D (HLA-DR), showed that arthritis in these strains is regulated by coding polymorphisms in the RT1-B genes. Motif prediction based on MHC-II eluted peptides and structural homology modeling suggested that variants in the RT1-B P1 pocket, which likely affect the editing capacity by RT1-DM, are important for the development of PIA.
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Affiliation(s)
- Sabrina Haag
- Division of Medical Inflammation Research, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, S-171 77, Stockholm, Sweden
| | - Jonatan Tuncel
- Division of Medical Inflammation Research, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, S-171 77, Stockholm, Sweden;
| | - Soley Thordardottir
- Division of Medical Inflammation Research, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, S-171 77, Stockholm, Sweden
| | - Daniel E Mason
- Genomics Institute of the Novartis Research Foundation, San Diego, CA 92121
| | - Anthony C Y Yau
- Division of Medical Inflammation Research, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, S-171 77, Stockholm, Sweden
| | - Doreen Dobritzsch
- Division of Molecular Structural Biology, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, S-171 77 Stockholm, Sweden; and Department of Chemistry, Biomedical Center, Uppsala University, S-751 24 Uppsala, Sweden
| | - Johan Bäcklund
- Division of Medical Inflammation Research, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, S-171 77, Stockholm, Sweden
| | - Eric C Peters
- Genomics Institute of the Novartis Research Foundation, San Diego, CA 92121
| | - Rikard Holmdahl
- Division of Medical Inflammation Research, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, S-171 77, Stockholm, Sweden;
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35
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van Kasteren SI, Overkleeft HS. Endo-lysosomal proteases in antigen presentation. Curr Opin Chem Biol 2014; 23:8-15. [PMID: 25213682 DOI: 10.1016/j.cbpa.2014.08.011] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2014] [Revised: 08/19/2014] [Accepted: 08/20/2014] [Indexed: 02/04/2023]
Abstract
Endo-lysosomal proteases have long been attractive, yet elusive, targets for medicinal chemistry. They have found to play key roles in health and disease; with protease under- and over-activity having been implicated in cancer, osteoporosis and Alzheimer's disease. Here we will discuss their role in the adaptive immune response. The crucial roles of these enzymes multiple processes in antigen presentation will be discussed: from activating MHC-II receptors, to the production of epitopes from antigens and the activation of Toll-like receptors. The early efforts at pharmacological interventions in these pathways will also be discussed.
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Affiliation(s)
- Sander I van Kasteren
- Division of Chemical Biology, Leiden Institute of Chemistry, Leiden University, Gorlaeus Laboratory, The Netherlands.
| | - Herman S Overkleeft
- Division of Chemical Biology, Leiden Institute of Chemistry, Leiden University, Gorlaeus Laboratory, The Netherlands
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36
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The human-specific invariant chain isoform Iip35 modulates Iip33 trafficking and function. Immunol Cell Biol 2014; 92:791-8. [PMID: 24983457 DOI: 10.1038/icb.2014.54] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2013] [Revised: 05/12/2014] [Accepted: 05/31/2014] [Indexed: 12/24/2022]
Abstract
The invariant chain (Ii) is a multifunctional protein, which has an essential role in the assembly and transport of major histocompatibility complex class II (MHC II) molecules. From a single gene, Ii is synthesized as four different isoforms: Iip33, Iip35, Iip41 and Iip43. Iip35 and Iip43 are specific to humans, and are formed due to an upstream alternative translation site, resulting in an N-terminal extension of 16 amino acids. This extension harbors a strong endoplasmic reticulum (ER) retention motif. Consequently, Iip35 or Iip43 expressed alone are retained in the ER, whereas Iip33 and Iip41 rapidly traffic to the endosomal pathway. Endogenously expressed, the four isoforms form mixed heterotrimers in the ER; however, mainly due to the absence of the Iip35/p43 isoforms in mice, little is known about how they influence general Ii function. In this study, we have co-expressed Iip33 and Iip35 in human cells with and without MHC II to gain a better understanding of how Iip35 isoform influences the cellular properties of Iip33. We find that Iip35 significantly affects the properties of Iip33. In the presence of Iip35, the transport of Iip33 out of the ER is delayed, its half-life is dramatically prolonged and its ability to induce enlarged endosomes and delayed endosomal maturation is abrogated.
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37
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The invariant chain p35 isoform promotes formation of nonameric complexes with MHC II molecules. Immunol Cell Biol 2014; 92:553-6. [PMID: 24638068 DOI: 10.1038/icb.2014.17] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2013] [Revised: 01/15/2014] [Accepted: 02/05/2014] [Indexed: 11/09/2022]
Abstract
Four different isoforms of the human invariant chain (Ii) have been described (p33, p35, p41 and p43). These heterotrimerize in the endoplasmic reticulum (ER) before associating with MHC class II molecules (MHCIIs). However, the final stoichiometry of the Ii/MHCII complex remains debated. This is particularly interesting as both p35 and p43 include a di-arginine motif that requires masking by MHCII to allow ER egress. Here, to functionally address the requirement for stoichiometric interactions, we used a recombinant DR heterodimer bearing its own cytoplasmic di-lysine ER-retention motif (DRKKAA). When coexpressed with p33 and a control myc-tagged DR (DRmyc), DRKKAA was retained in the ER but had little impact on surface expression of DRmyc. However, when coexpressed with p35, DRKKAA restricted the surface expression of DRmyc, indicating that Ii trimers can be loaded with more than one MHCII. Similar results were obtained using HLA-DQ instead of DRmyc, showing that a single trimeric Ii scaffold can include distinct MHCII isotypes. Altogether, these results demonstrate that the subunit stoichiometry of oligomeric Ii/MHCII complexes is influenced by p35.
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38
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Fortin JS, Genève L, Gauthier C, Shoukry NH, Azar GA, Younes S, Yassine-Diab B, Sékaly RP, Fremont DH, Thibodeau J. MMTV superantigens coerce an unconventional topology between the TCR and MHC class II. THE JOURNAL OF IMMUNOLOGY 2014; 192:1896-906. [PMID: 24453254 DOI: 10.4049/jimmunol.1203130] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Mouse mammary tumor virus superantigens (vSAGs) are notorious for defying structural characterization, and a consensus has yet to be reached regarding their ability to bridge the TCR to MHC class II (MHCII). In this study, we determined the topology of the T cell signaling complex by examining the respective relation of vSAG7 with the MHCII molecule, MHCII-associated peptide, and TCR. We used covalently linked peptide/MHCII complexes to demonstrate that vSAG presentation is tolerant to variation in the protruding side chains of the peptide, but can be sensitive to the nature of the protruding N-terminal extension. An original approach in which vSAG was covalently linked to either MHCII chain confirmed that vSAG binds outside the peptide binding groove. Also, whereas the C-terminal vSAG segment binds to the MHCII α-chain in a conformation-sensitive manner, the membrane-proximal N-terminal domain binds the β-chain. Because both moieties of the mature vSAG remain noncovalently associated after processing, our results suggest that vSAG crosslinks MHCII molecules. Comparing different T cell hybridomas, we identified key residues on the MHCII α-chain that are differentially recognized by the CDR3β when engaged by vSAG. Finally, we show that the highly conserved tyrosine residue found in the vSAg TGXY motif is required for T cell activation. Our results reveal a novel SAG/MHCII/TCR architecture in which vSAGs coerce a near-canonical docking between MHCII and TCR that allows eschewing of traditional CDR3 binding with the associated peptide in favor of MHCII α-chain binding. Our findings highlight the plasticity of the TCR CDRs.
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Affiliation(s)
- Jean-Simon Fortin
- Laboratoire d'Immunologie Moléculaire, Département de Microbiologie, Infectiologie et Immunologie, Université de Montréal, Montreal, Quebec HC3 3J7, Canada
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Denzin LK. Inhibition of HLA-DM Mediated MHC Class II Peptide Loading by HLA-DO Promotes Self Tolerance. Front Immunol 2013; 4:465. [PMID: 24381574 PMCID: PMC3865790 DOI: 10.3389/fimmu.2013.00465] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2013] [Accepted: 12/03/2013] [Indexed: 12/05/2022] Open
Abstract
Major histocompatibility class II (MHCII) molecules are loaded with peptides derived from foreign and self-proteins within the endosomes and lysosomes of antigen presenting cells (APCs). This process is mediated by interaction of MHCII with the conserved, non-polymorphic MHCII like molecule HLA-DM (DM). DM activity is directly opposed by HLA-DO (DO), another conserved, non-polymorphic MHCII like molecule. DO is an MHCII substrate mimic. Binding of DO to DM prevents MHCII from binding to DM, thereby inhibiting peptide loading. Inhibition of DM function enables low stability MHC complexes to survive and populate the surface of APCs. As a consequence, DO promotes the display of a broader pool of low abundance self-peptides. Broadening the peptide repertoire theoretically reduces the likelihood of inadvertently acquiring a density of self-ligands that is sufficient to activate self-reactive T cells. One function of DO, therefore, is to promote T cell tolerance by shaping the visible image of self. Recent data also shows that DO influences the adaptive immune response by controlling B cell entry into the germinal center reaction. This review explores the data supporting these concepts.
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Affiliation(s)
- Lisa K Denzin
- Department of Pediatrics, Robert Wood Johnson Medical School, Child Health Institute of New Jersey, Rutgers, The State University of New Jersey , New Brunswick, NJ , USA
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40
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Miller MA, Ganesan APV, Eisenlohr LC. Toward a Network Model of MHC Class II-Restricted Antigen Processing. Front Immunol 2013; 4:464. [PMID: 24379819 PMCID: PMC3864185 DOI: 10.3389/fimmu.2013.00464] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2013] [Accepted: 12/03/2013] [Indexed: 11/16/2022] Open
Abstract
The standard model of Major Histocompatibility Complex class II (MHCII)-restricted antigen processing depicts a straightforward, linear pathway: internalized antigens are converted into peptides that load in a chaperone dependent manner onto nascent MHCII in the late endosome, the complexes subsequently trafficking to the cell surface for recognition by CD4(+) T cells (TCD4+). Several variations on this theme, both moderate and radical, have come to light but these alternatives have remained peripheral, the conventional pathway generally presumed to be the primary driver of TCD4+ responses. Here we continue to press for the conceptual repositioning of these alternatives toward the center while proposing that MHCII processing be thought of less in terms of discrete pathways and more in terms of a network whose major and minor conduits are variable depending upon many factors, including the epitope, the nature of the antigen, the source of the antigen, and the identity of the antigen-presenting cell.
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Affiliation(s)
- Michael A. Miller
- Department of Microbiology and Immunology, Thomas Jefferson University, Philadelphia, PA, USA
| | - Asha Purnima V. Ganesan
- Department of Microbiology and Immunology, Thomas Jefferson University, Philadelphia, PA, USA
| | - Laurence C. Eisenlohr
- Department of Microbiology and Immunology, Thomas Jefferson University, Philadelphia, PA, USA
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ten Broeke T, Wubbolts R, Stoorvogel W. MHC class II antigen presentation by dendritic cells regulated through endosomal sorting. Cold Spring Harb Perspect Biol 2013; 5:a016873. [PMID: 24296169 DOI: 10.1101/cshperspect.a016873] [Citation(s) in RCA: 119] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
For the initiation of adaptive immune responses, dendritic cells present antigenic peptides in association with major histocompatibility complex class II (MHCII) to naïve CD4(+) T lymphocytes. In this review, we discuss how antigen presentation is regulated through intracellular processing and trafficking of MHCII. Newly synthesized MHCII is chaperoned by the invariant chain to endosomes, where peptides from endocytosed pathogens can bind. In nonactivated dendritic cells, peptide-loaded MHCII is ubiquitinated and consequently sorted by the ESCRT machinery to intraluminal vesicles of multivesicular bodies, ultimately leading to lysosomal degradation. Ubiquitination of newly synthesized MHCII is blocked when dendritic cells are activated, now allowing its transfer to the cell surface. This mode of regulation for MHCII is a prime example of how molecular processing and sorting at multivesicular bodies can determine the expression of signaling receptors at the plasma membrane.
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Affiliation(s)
- Toine ten Broeke
- Utrecht University, Faculty of Veterinary Medicine, Department of Biochemistry and Cell Biology, Yalelaan 2, 3584 CM, Utrecht, The Netherlands
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42
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Roy K, Ghosh M, Pal TK, Chakrabarti S, Roy S. Cholesterol lowering drug may influence cellular immune response by altering MHC II function. J Lipid Res 2013; 54:3106-15. [PMID: 24038316 DOI: 10.1194/jlr.m041954] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Major histocompatibility complex class II (MHC II) expressed on the surface of antigen-presenting cells (APCs) displays peptides to CD4⁺ T cells. Depletion of membrane cholesterol from APCs by methyl β-cyclodextrin treatment compromises peptide-MHC II complex formation coupled with impaired binding of conformational antibody, which binds close to the peptide binding groove of MHC II. Interestingly, the total cell surface of MHC II remains unaltered. These defects can be corrected by restoring membrane cholesterol. In silico docking studies with a three-dimensional model showed the presence of a cholesterol binding site in the transmembrane domain of MHC II (TM-MHC-II). From the binding studies it was clear that cholesterol, indeed, interacts with the TM-MHC-II and alters its conformation. Mutation of cholesterol binding residues (F240, L243, and F246) in the TM-MHC-II decreased the affinity for cholesterol. Furthermore, transfection of CHO cells with full-length mutant MHC II, but not wild-type MHC II, failed to activate antigen-specific T cells coupled with decreased binding of conformation-specific antibodies. Thus, cholesterol-induced conformational change of TM-MHC-II may allosterically modulate the peptide binding groove of MHC II leading to T cell activation.
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Affiliation(s)
- Koushik Roy
- Infectious Diseases and Immunology and CSIR -Indian Institute of Chemical Biology, Jadavpur, Kolkata-700032, India
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Braendstrup P, Justesen S, Østerbye T, Nielsen LLB, Mallone R, Vindeløv L, Stryhn A, Buus S. MHC class II tetramers made from isolated recombinant α and β chains refolded with affinity-tagged peptides. PLoS One 2013; 8:e73648. [PMID: 24023895 PMCID: PMC3759463 DOI: 10.1371/journal.pone.0073648] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2013] [Accepted: 07/22/2013] [Indexed: 12/24/2022] Open
Abstract
Targeting CD4+ T cells through their unique antigen-specific, MHC class II-restricted T cell receptor makes MHC class II tetramers an attractive strategy to identify, validate and manipulate these cells at the single cell level. Currently, generating class II tetramers is a specialized undertaking effectively limiting their use and emphasizing the need for improved methods of production. Using class II chains expressed individually in E. coli as versatile recombinant reagents, we have previously generated peptide-MHC class II monomers, but failed to generate functional class II tetramers. Adding a monomer purification principle based upon affinity-tagged peptides, we here provide a robust method to produce class II tetramers and demonstrate staining of antigen-specific CD4+ T cells. We also provide evidence that both MHC class II and T cell receptor molecules largely accept affinity-tagged peptides. As a general approach to class II tetramer generation, this method should support rational CD4+ T cell epitope discovery as well as enable specific monitoring and manipulation of CD4+ T cell responses.
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Affiliation(s)
- Peter Braendstrup
- Laboratory of Experimental Immunology, University of Copenhagen, Copenhagen, Denmark
- Allogeneic Hematopoietic Cell Transplantation Laboratory, Department of Hematology, Rigshospitalet, Copenhagen, Denmark
| | - Sune Justesen
- Laboratory of Experimental Immunology, University of Copenhagen, Copenhagen, Denmark
| | - Thomas Østerbye
- Laboratory of Experimental Immunology, University of Copenhagen, Copenhagen, Denmark
| | | | - Roberto Mallone
- Institut National de la Santé et de la Recherche Médicale, Unité 1016, Cochin Institute, DeAR Lab Avenir, Paris, France
| | - Lars Vindeløv
- Allogeneic Hematopoietic Cell Transplantation Laboratory, Department of Hematology, Rigshospitalet, Copenhagen, Denmark
| | - Anette Stryhn
- Laboratory of Experimental Immunology, University of Copenhagen, Copenhagen, Denmark
| | - Søren Buus
- Laboratory of Experimental Immunology, University of Copenhagen, Copenhagen, Denmark
- * E-mail:
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Wijdeven RH, Bakker JM, Paul P, Neefjes J. Exploring genome-wide datasets of MHC class II antigen presentation. Mol Immunol 2013; 55:172-4. [DOI: 10.1016/j.molimm.2012.10.014] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2012] [Accepted: 10/12/2012] [Indexed: 10/27/2022]
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Pos W, Sethi DK, Call MJ, Schulze MSED, Anders AK, Pyrdol J, Wucherpfennig KW. Crystal structure of the HLA-DM-HLA-DR1 complex defines mechanisms for rapid peptide selection. Cell 2013; 151:1557-68. [PMID: 23260142 DOI: 10.1016/j.cell.2012.11.025] [Citation(s) in RCA: 131] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2012] [Revised: 10/15/2012] [Accepted: 11/14/2012] [Indexed: 12/18/2022]
Abstract
HLA-DR molecules bind microbial peptides in an endosomal compartment and present them on the cell surface for CD4 T cell surveillance. HLA-DM plays a critical role in the endosomal peptide selection process. The structure of the HLA-DM-HLA-DR complex shows major rearrangements of the HLA-DR peptide-binding groove. Flipping of a tryptophan away from the HLA-DR1 P1 pocket enables major conformational changes that position hydrophobic HLA-DR residues into the P1 pocket. These conformational changes accelerate peptide dissociation and stabilize the empty HLA-DR peptide-binding groove. Initially, incoming peptides have access to only part of the HLA-DR groove and need to compete with HLA-DR residues for access to the P2 site and the hydrophobic P1 pocket. This energetic barrier creates a rapid and stringent selection process for the highest-affinity binders. Insertion of peptide residues into the P2 and P1 sites reverses the conformational changes, terminating selection through DM dissociation.
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Affiliation(s)
- Wouter Pos
- Department of Cancer Immunology & AIDS, Dana-Farber Cancer Institute, Boston, MA 02115, USA
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Cronin K, Escobar H, Szekeres K, Reyes-Vargas E, Rockwood AL, Lloyd MC, Delgado JC, Blanck G. Regulation of HLA-DR peptide occupancy by histone deacetylase inhibitors. Hum Vaccin Immunother 2013; 9:784-9. [PMID: 23328677 DOI: 10.4161/hv.23085] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Numerous molecular effects have been attributed to histone deacetylase inhibitors (HDACI's), including the induction of major histocompatibility (MHC) genes. Here we report that one FDA approved HDACI, Vorinostat, and a second HDACI currently in clinical trials, Entinostat, reduce the ratio of class II associated invariant peptide (CLIP) to the MHC class II molecule, HLA-DR, indicating an increase in the non-CLIP peptides bound to HLA-DR. The HDACI effects are apparent with immortalized B-cells, HLA-DR constitutive melanoma cells and with melanoma cells expressing HLA-DR due to transformation with an expression vector for the HLA-DR gene co-activator, CIITA. Entinostat treatment leads to upregulation of Cathepsin L1, and the HLA-DR peptidome of the Entinostat treated cells is consistent with increased Cathepsin L1 mediated proteolysis. These results indicate that HDACI treatments may alter the HLA-DR peptidome of cells in patients and provide a way to identify novel immunogens for vaccinations and the study of autoantigens.
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Affiliation(s)
- Kevin Cronin
- Department of Molecular Medicine; Morsani College of Medicine; University of South Florida; Tampa, FL USA
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47
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Abstract
T cell recognition of antigen-presenting cells depends on their expression of a spectrum of peptides bound to major histocompatibility complex class I (MHC-I) and class II (MHC-II) molecules. Conversion of antigens from pathogens or transformed cells into MHC-I- and MHC-II-bound peptides is critical for mounting protective T cell responses, and similar processing of self proteins is necessary to establish and maintain tolerance. Cells use a variety of mechanisms to acquire protein antigens, from translation in the cytosol to variations on the theme of endocytosis, and to degrade them once acquired. In this review, we highlight the aspects of MHC-I and MHC-II biosynthesis and assembly that have evolved to intersect these pathways and sample the peptides that are produced.
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Affiliation(s)
- Janice S Blum
- Department of Microbiology and Immunology, Indiana University School of Medicine, Indianapolis, Indiana 46202, USA.
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48
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Pulse-chase analysis for studies of MHC class II biosynthesis, maturation, and peptide loading. Methods Mol Biol 2013; 960:411-432. [PMID: 23329504 DOI: 10.1007/978-1-62703-218-6_31] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Pulse-chase analysis is a commonly used technique for studying the synthesis, processing and transport of proteins. Cultured cells expressing proteins of interest are allowed to take up radioactively labeled amino acids for a brief interval ("pulse"), during which all newly synthesized proteins incorporate the label. The cells are then returned to nonradioactive culture medium for various times ("chase"), during which proteins may undergo conformational changes, trafficking, or degradation. Proteins of interest are isolated (usually by immunoprecipitation) and resolved by sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE), and the fate of radiolabeled molecules is examined by autoradiography. This chapter describes a pulse-chase protocol suitable for studies of major histocompatibility complex (MHC) class II biosynthesis and maturation. We discuss how results are affected by the recognition by certain anti-class II antibodies of distinct class II conformations associated with particular biosynthetic states. Our protocol can be adapted to follow the fate of many other endogenously synthesized proteins, including viral or transfected gene products, in cultured cells.
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HLA-DO acts as a substrate mimic to inhibit HLA-DM by a competitive mechanism. Nat Struct Mol Biol 2012; 20:90-8. [PMID: 23222639 PMCID: PMC3537886 DOI: 10.1038/nsmb.2460] [Citation(s) in RCA: 90] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2012] [Accepted: 10/25/2012] [Indexed: 12/03/2022]
Abstract
MHCII proteins bind peptide antigens in endosomal compartments of antigen-presenting cells. The non-classical MHCII protein HLA-DM chaperones peptide-free MHCII against inactivation and catalyzes peptide exchange on loaded MHCII. Another non-classical MHCII protein, HLA-DO, binds HLA-DM and influences the repertoire of peptides presented by MHCII proteins. However, the mechanism by which HLA-DO functions is unclear. Here we use x-ray crystallography, enzyme kinetics and mutagenesis approaches to investigate human HLA-DO structure and function. In complex with HLA-DM, HLA-DO adopts a classical MHCII structure, with alterations near the alpha subunit 310 helix. HLA-DO binds to HLA-DM at the same sites implicated in MHCII interaction, and kinetic analysis demonstrates that HLA-DO acts as a competitive inhibitor. These results show that HLA-DO inhibits HLA-DM function by acting as a substrate mimic and place constraints on possible functional roles for HLA-DO in antigen presentation.
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50
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Mantegazza AR, Magalhaes JG, Amigorena S, Marks MS. Presentation of phagocytosed antigens by MHC class I and II. Traffic 2012; 14:135-52. [PMID: 23127154 DOI: 10.1111/tra.12026] [Citation(s) in RCA: 145] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2012] [Revised: 11/01/2012] [Accepted: 11/06/2012] [Indexed: 12/15/2022]
Abstract
Phagocytosis provides innate immune cells with a mechanism to take up and destroy pathogenic bacteria, apoptotic cells and other large particles. In some cases, however, peptide antigens from these particles are preserved for presentation in association with major histocompatibility complex (MHC) class I or class II molecules in order to stimulate antigen-specific T cells. Processing and presentation of antigens from phagosomes presents a number of distinct challenges relative to antigens internalized by other means; while bacterial antigens were among the first discovered to be presented to T cells, analyses of the cellular mechanisms by which peptides from phagocytosed antigens assemble with MHC molecules and by which these complexes are then expressed at the plasma membrane have lagged behind those of conventional model soluble antigens. In this review, we cover recent advances in our understanding of these processes, including the unique cross-presentation of phagocytosed antigens by MHC class I molecules, and in their control by signaling modalities in phagocytic cells.
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Affiliation(s)
- Adriana R Mantegazza
- Department of Pathology & Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
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