1
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San D, Lei J, Liu Y, Jing B, Ye X, Wei P, Paek C, Yang Y, Zhou J, Chen P, Wang H, Chen Y, Yin L. Structural basis of the TCR-pHLA complex provides insights into the unconventional recognition of CDR3β in TCR cross-reactivity and alloreactivity. CELL INSIGHT 2023; 2:100076. [PMID: 37192909 PMCID: PMC10120306 DOI: 10.1016/j.cellin.2022.100076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/03/2022] [Revised: 12/17/2022] [Accepted: 12/18/2022] [Indexed: 05/18/2023]
Abstract
Evidence shows that some class I human leucocyte antigen (HLA) alleles are related to durable HIV controls. The T18A TCR, which has the alloreactivity between HLA-B∗42:01 and HLA-B∗81:01 and the cross-reactivity with different antigen mutants, can sustain long-term HIV controls. Here the structural basis of the T18A TCR binding to the immunodominant HIV epitope TL9 (TPQDLNTML180-188) presented by HLA-B∗42:01 was determined and compared to T18A TCR binding to the TL9 presented by the allo-HLA-B∗81:01. For differences between HLA-B∗42:01 and HLA-B∗81:01, the CDR1α and CDR3α loops adopt a small rearrangement to accommodate them. For different conformations of the TL9 presented by different HLA alleles, not like the conventional recognition of CDR3s to interact with peptide antigens, CDR3β of the T18A TCR shifts to avoid the peptide antigen but intensively recognizes the HLA only, which is different with other conventional TCR structures. Featured sequence pairs of CDR3β and HLA might account for this and were additionally found in multiple other diseases indicating the popularity of the unconventional recognition pattern which would give insights into the control of diseases with epitope mutating such as HIV.
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Affiliation(s)
| | | | | | - Baowei Jing
- State Key Laboratory of Virology, Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences, Department of Clinical Oncology, Renmin Hospital of Wuhan University, Wuhan University, Wuhan, China
| | - Xiang Ye
- State Key Laboratory of Virology, Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences, Department of Clinical Oncology, Renmin Hospital of Wuhan University, Wuhan University, Wuhan, China
| | - Pengcheng Wei
- State Key Laboratory of Virology, Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences, Department of Clinical Oncology, Renmin Hospital of Wuhan University, Wuhan University, Wuhan, China
| | - Chonil Paek
- State Key Laboratory of Virology, Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences, Department of Clinical Oncology, Renmin Hospital of Wuhan University, Wuhan University, Wuhan, China
| | - Yi Yang
- State Key Laboratory of Virology, Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences, Department of Clinical Oncology, Renmin Hospital of Wuhan University, Wuhan University, Wuhan, China
| | - Jin Zhou
- State Key Laboratory of Virology, Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences, Department of Clinical Oncology, Renmin Hospital of Wuhan University, Wuhan University, Wuhan, China
| | - Peng Chen
- State Key Laboratory of Virology, Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences, Department of Clinical Oncology, Renmin Hospital of Wuhan University, Wuhan University, Wuhan, China
| | - Hongjian Wang
- State Key Laboratory of Virology, Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences, Department of Clinical Oncology, Renmin Hospital of Wuhan University, Wuhan University, Wuhan, China
| | - Yongshun Chen
- State Key Laboratory of Virology, Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences, Department of Clinical Oncology, Renmin Hospital of Wuhan University, Wuhan University, Wuhan, China
| | - Lei Yin
- State Key Laboratory of Virology, Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences, Department of Clinical Oncology, Renmin Hospital of Wuhan University, Wuhan University, Wuhan, China
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2
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Souter MN, Awad W, Li S, Pediongco TJ, Meehan BS, Meehan LJ, Tian Z, Zhao Z, Wang H, Nelson A, Le Nours J, Khandokar Y, Praveena T, Wubben J, Lin J, Sullivan LC, Lovrecz GO, Mak JY, Liu L, Kostenko L, Kedzierska K, Corbett AJ, Fairlie DP, Brooks AG, Gherardin NA, Uldrich AP, Chen Z, Rossjohn J, Godfrey DI, McCluskey J, Pellicci DG, Eckle SB. CD8 coreceptor engagement of MR1 enhances antigen responsiveness by human MAIT and other MR1-reactive T cells. J Exp Med 2022; 219:213423. [PMID: 36018322 PMCID: PMC9424912 DOI: 10.1084/jem.20210828] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2021] [Revised: 06/24/2022] [Accepted: 07/21/2022] [Indexed: 11/04/2022] Open
Abstract
Mucosal-associated invariant T (MAIT) cells detect microbial infection via recognition of riboflavin-based antigens presented by the major histocompatibility complex class I (MHC-I)-related protein 1 (MR1). Most MAIT cells in human peripheral blood express CD8αα or CD8αβ coreceptors, and the binding site for CD8 on MHC-I molecules is relatively conserved in MR1. Yet, there is no direct evidence of CD8 interacting with MR1 or the functional consequences thereof. Similarly, the role of CD8αα in lymphocyte function remains ill-defined. Here, using newly developed MR1 tetramers, mutated at the CD8 binding site, and by determining the crystal structure of MR1-CD8αα, we show that CD8 engaged MR1, analogous to how it engages MHC-I molecules. CD8αα and CD8αβ enhanced MR1 binding and cytokine production by MAIT cells. Moreover, the CD8-MR1 interaction was critical for the recognition of folate-derived antigens by other MR1-reactive T cells. Together, our findings suggest that both CD8αα and CD8αβ act as functional coreceptors for MAIT and other MR1-reactive T cells.
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Affiliation(s)
- Michael N.T. Souter
- Department of Microbiology and Immunology, The University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, Australia
| | - Wael Awad
- Infection and Immunity Program and Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, Monash University, Melbourne, Australia
| | - Shihan Li
- Department of Microbiology and Immunology, The University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, Australia
| | - Troi J. Pediongco
- Department of Microbiology and Immunology, The University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, Australia
| | - Bronwyn S. Meehan
- Department of Microbiology and Immunology, The University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, Australia
| | - Lucy J. Meehan
- Department of Microbiology and Immunology, The University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, Australia
| | - Zehua Tian
- Department of Microbiology and Immunology, The University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, Australia
| | - Zhe Zhao
- Department of Microbiology and Immunology, The University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, Australia
| | - Huimeng Wang
- Department of Microbiology and Immunology, The University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, Australia,State Key Laboratory of Respiratory Disease, Guangzhou Institute of Respiratory Disease, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, China
| | - Adam Nelson
- Department of Microbiology and Immunology, The University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, Australia
| | - Jérôme Le Nours
- Infection and Immunity Program and Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, Monash University, Melbourne, Australia
| | - Yogesh Khandokar
- Infection and Immunity Program and Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, Monash University, Melbourne, Australia
| | - T. Praveena
- Infection and Immunity Program and Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, Monash University, Melbourne, Australia
| | - Jacinta Wubben
- Infection and Immunity Program and Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, Monash University, Melbourne, Australia
| | - Jie Lin
- Department of Microbiology and Immunology, The University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, Australia
| | - Lucy C. Sullivan
- Department of Microbiology and Immunology, The University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, Australia
| | - George O. Lovrecz
- Biomedical Manufacturing, Commonwealth Scientific and Industrial Research Organisation, Melbourne, Australia
| | - Jeffrey Y.W. Mak
- Division of Chemistry and Structural Biology, Institute for Molecular Bioscience, The University of Queensland, Brisbane, Australia
| | - Ligong Liu
- Division of Chemistry and Structural Biology, Institute for Molecular Bioscience, The University of Queensland, Brisbane, Australia
| | - Lyudmila Kostenko
- Department of Microbiology and Immunology, The University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, Australia
| | - Katherine Kedzierska
- Department of Microbiology and Immunology, The University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, Australia
| | - Alexandra J. Corbett
- Department of Microbiology and Immunology, The University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, Australia
| | - David P. Fairlie
- Division of Chemistry and Structural Biology, Institute for Molecular Bioscience, The University of Queensland, Brisbane, Australia
| | - Andrew G. Brooks
- Department of Microbiology and Immunology, The University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, Australia
| | - Nicholas A. Gherardin
- Department of Microbiology and Immunology, The University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, Australia
| | - Adam P. Uldrich
- Department of Microbiology and Immunology, The University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, Australia
| | - Zhenjun Chen
- Department of Microbiology and Immunology, The University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, Australia
| | - Jamie Rossjohn
- Infection and Immunity Program and Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, Monash University, Melbourne, Australia,Institute of Infection and Immunity, School of Medicine, Cardiff University, Cardiff, UK
| | - Dale I. Godfrey
- Department of Microbiology and Immunology, The University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, Australia
| | - James McCluskey
- Department of Microbiology and Immunology, The University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, Australia
| | - Daniel G. Pellicci
- Department of Microbiology and Immunology, The University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, Australia,Murdoch Children’s Research Institute, Parkville, Melbourne, Australia
| | - Sidonia B.G. Eckle
- Department of Microbiology and Immunology, The University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, Australia
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3
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Liu Y, Lei J, San D, Yang Y, Paek C, Xia Z, Chen Y, Yin L. Structural Basis for Unusual TCR CDR3β Usage Against an Immunodominant HIV-1 Gag Protein Peptide Restricted to an HLA-B*81:01 Molecule. Front Immunol 2022; 13:822210. [PMID: 35173732 PMCID: PMC8841528 DOI: 10.3389/fimmu.2022.822210] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2021] [Accepted: 01/12/2022] [Indexed: 12/02/2022] Open
Abstract
In HIV infection, some closely associated human leukocyte antigen (HLA) alleles are correlated with distinct clinical outcomes although presenting the same HIV epitopes. The mechanism that underpins this observation is still unknown, but may be due to the essential features of HLA alleles or T cell receptors (TCR). In this study, we investigate how T18A TCR, which is beneficial for a long-term control of HIV in clinic, recognizes immunodominant Gag epitope TL9 (TPQDLTML180-188) from HIV in the context of the antigen presenting molecule HLA-B*81:01. We found that T18A TCR exhibits differential recognition for TL9 restricted by HLA-B*81:01. Furthermore, via structural and biophysical approaches, we observed that TL9 complexes with HLA-B*81:01 undergoes no conformational change after TCR engagement. Remarkably, the CDR3β in T18A complexes does not contact with TL9 at all but with intensive contacts to HLA-B*81:01. The binding kinetic data of T18A TCR revealed that this TCR can recognize TL9 epitope and several mutant versions, which might explain the correlation of T18A TCR with better clinic outcomes despite the relative high mutation rate of HIV. Collectively, we provided a portrait of how CD8+ T cells engage in HIV-mediated T cell response.
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Affiliation(s)
- Yang Liu
- State Key Laboratory of Virology, College of Life Sciences, Wuhan University, Wuhan, China
| | - Jun Lei
- Department of Clinical Oncology, Renmin Hospital of Wuhan University, Wuhan, China
| | - Dan San
- State Key Laboratory of Virology, College of Life Sciences, Wuhan University, Wuhan, China
| | - Yi Yang
- State Key Laboratory of Virology, College of Life Sciences, Wuhan University, Wuhan, China
| | - Chonil Paek
- State Key Laboratory of Virology, College of Life Sciences, Wuhan University, Wuhan, China
| | - Zixiong Xia
- State Key Laboratory of Virology, College of Life Sciences, Wuhan University, Wuhan, China
| | - Yongshun Chen
- Department of Clinical Oncology, Renmin Hospital of Wuhan University, Wuhan, China
- *Correspondence: Yongshun Chen, ; Lei Yin,
| | - Lei Yin
- State Key Laboratory of Virology, College of Life Sciences, Wuhan University, Wuhan, China
- *Correspondence: Yongshun Chen, ; Lei Yin,
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4
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The interplay between membrane topology and mechanical forces in regulating T cell receptor activity. Commun Biol 2022; 5:40. [PMID: 35017678 PMCID: PMC8752658 DOI: 10.1038/s42003-021-02995-1] [Citation(s) in RCA: 38] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2021] [Accepted: 12/21/2021] [Indexed: 12/20/2022] Open
Abstract
T cells are critically important for host defense against infections. T cell activation is specific because signal initiation requires T cell receptor (TCR) recognition of foreign antigen peptides presented by major histocompatibility complexes (pMHC) on antigen presenting cells (APCs). Recent advances reveal that the TCR acts as a mechanoreceptor, but it remains unclear how pMHC/TCR engagement generates mechanical forces that are converted to intracellular signals. Here we propose a TCR Bending Mechanosignal (TBM) model, in which local bending of the T cell membrane on the nanometer scale allows sustained contact of relatively small pMHC/TCR complexes interspersed among large surface receptors and adhesion molecules on the opposing surfaces of T cells and APCs. Localized T cell membrane bending is suggested to increase accessibility of TCR signaling domains to phosphorylation, facilitate selective recognition of agonists that form catch bonds, and reduce noise signals associated with slip bonds. Al-Aghbar et al propose a TCR bending mechanosignal model that demonstrates how local mechanical membrane bending may influence T cell receptor binding events and thus T-cell activation.
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5
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Holland CJ, Crean RM, Pentier JM, de Wet B, Lloyd A, Srikannathasan V, Lissin N, Lloyd KA, Blicher TH, Conroy PJ, Hock M, Pengelly RJ, Spinner TE, Cameron B, Potter EA, Jeyanthan A, Molloy PE, Sami M, Aleksic M, Liddy N, Robinson RA, Harper S, Lepore M, Pudney CR, van der Kamp MW, Rizkallah PJ, Jakobsen BK, Vuidepot A, Cole DK. Specificity of bispecific T cell receptors and antibodies targeting peptide-HLA. J Clin Invest 2021; 130:2673-2688. [PMID: 32310221 DOI: 10.1172/jci130562] [Citation(s) in RCA: 47] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2019] [Accepted: 02/11/2020] [Indexed: 01/09/2023] Open
Abstract
Tumor-associated peptide-human leukocyte antigen complexes (pHLAs) represent the largest pool of cell surface-expressed cancer-specific epitopes, making them attractive targets for cancer therapies. Soluble bispecific molecules that incorporate an anti-CD3 effector function are being developed to redirect T cells against these targets using 2 different approaches. The first achieves pHLA recognition via affinity-enhanced versions of natural TCRs (e.g., immune-mobilizing monoclonal T cell receptors against cancer [ImmTAC] molecules), whereas the second harnesses an antibody-based format (TCR-mimic antibodies). For both classes of reagent, target specificity is vital, considering the vast universe of potential pHLA molecules that can be presented on healthy cells. Here, we made use of structural, biochemical, and computational approaches to investigate the molecular rules underpinning the reactivity patterns of pHLA-targeting bispecifics. We demonstrate that affinity-enhanced TCRs engage pHLA using a comparatively broad and balanced energetic footprint, with interactions distributed over several HLA and peptide side chains. As ImmTAC molecules, these TCRs also retained a greater degree of pHLA selectivity, with less off-target activity in cellular assays. Conversely, TCR-mimic antibodies tended to exhibit binding modes focused more toward hot spots on the HLA surface and exhibited a greater degree of crossreactivity. Our findings extend our understanding of the basic principles that underpin pHLA selectivity and exemplify a number of molecular approaches that can be used to probe the specificity of pHLA-targeting molecules, aiding the development of future reagents.
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Affiliation(s)
| | - Rory M Crean
- Department of Biology and Biochemistry and.,Doctoral Training Centre in Sustainable Chemical Technologies, University of Bath, Bath, United Kingdom
| | | | - Ben de Wet
- Immunocore Ltd., Milton Park, Abingdon, United Kingdom
| | | | | | | | - Katy A Lloyd
- Immunocore Ltd., Milton Park, Abingdon, United Kingdom
| | | | - Paul J Conroy
- Immunocore Ltd., Milton Park, Abingdon, United Kingdom
| | - Miriam Hock
- Immunocore Ltd., Milton Park, Abingdon, United Kingdom
| | | | | | - Brian Cameron
- Immunocore Ltd., Milton Park, Abingdon, United Kingdom
| | | | | | | | - Malkit Sami
- Immunocore Ltd., Milton Park, Abingdon, United Kingdom
| | - Milos Aleksic
- Immunocore Ltd., Milton Park, Abingdon, United Kingdom
| | | | | | | | - Marco Lepore
- Immunocore Ltd., Milton Park, Abingdon, United Kingdom
| | | | | | - Pierre J Rizkallah
- Cardiff University School of Medicine, Heath Park, Cardiff, United Kingdom
| | | | | | - David K Cole
- Immunocore Ltd., Milton Park, Abingdon, United Kingdom.,Cardiff University School of Medicine, Heath Park, Cardiff, United Kingdom
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6
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Hopkins JR, Crean RM, Catici DAM, Sewell AK, Arcus VL, Van der Kamp MW, Cole DK, Pudney CR. Peptide cargo tunes a network of correlated motions in human leucocyte antigens. FEBS J 2020; 287:3777-3793. [PMID: 32134551 PMCID: PMC8651013 DOI: 10.1111/febs.15278] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2019] [Revised: 02/20/2020] [Accepted: 03/03/2020] [Indexed: 11/28/2022]
Abstract
Most biomolecular interactions are typically thought to increase the (local) rigidity of a complex, for example, in drug‐target binding. However, detailed analysis of specific biomolecular complexes can reveal a more subtle interplay between binding and rigidity. Here, we focussed on the human leucocyte antigen (HLA), which plays a crucial role in the adaptive immune system by presenting peptides for recognition by the αβ T‐cell receptor (TCR). The role that the peptide plays in tuning HLA flexibility during TCR recognition is potentially crucial in determining the functional outcome of an immune response, with obvious relevance to the growing list of immunotherapies that target the T‐cell compartment. We have applied high‐pressure/temperature perturbation experiments, combined with molecular dynamics simulations, to explore the drivers that affect molecular flexibility for a series of different peptide–HLA complexes. We find that different peptide sequences affect peptide–HLA flexibility in different ways, with the peptide cargo tuning a network of correlated motions throughout the pHLA complex, including in areas remote from the peptide‐binding interface, in a manner that could influence T‐cell antigen discrimination.
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Affiliation(s)
- Jade R Hopkins
- Division of Infection and Immunity, School of Medicine, Cardiff University, UK
| | - Rory M Crean
- Department of Biology and Biochemistry, University of Bath, UK.,Doctoral Training Centre in Sustainable Chemical Technologies, University of Bath, UK
| | | | - Andrew K Sewell
- Division of Infection and Immunity, School of Medicine, Cardiff University, UK
| | - Vickery L Arcus
- School of Science, Faculty of Science and Engineering, University of Waikato, Hamilton, New Zealand
| | | | - David K Cole
- Division of Infection and Immunity, School of Medicine, Cardiff University, UK
| | - Christopher R Pudney
- Department of Biology and Biochemistry, University of Bath, UK.,Centre for Therapeutic Innovation, University of Bath, UK
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7
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Whalley T, Dolton G, Brown PE, Wall A, Wooldridge L, van den Berg H, Fuller A, Hopkins JR, Crowther MD, Attaf M, Knight RR, Cole DK, Peakman M, Sewell AK, Szomolay B. GPU-Accelerated Discovery of Pathogen-Derived Molecular Mimics of a T-Cell Insulin Epitope. Front Immunol 2020; 11:296. [PMID: 32184781 PMCID: PMC7058665 DOI: 10.3389/fimmu.2020.00296] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2019] [Accepted: 02/05/2020] [Indexed: 01/09/2023] Open
Abstract
The strong links between (Human Leukocyte Antigen) HLA, infection and autoimmunity combine to implicate T-cells as primary triggers of autoimmune disease (AD). T-cell crossreactivity between microbially-derived peptides and self-peptides has been shown to break tolerance and trigger AD in experimental animal models. Detailed examination of the potential for T-cell crossreactivity to trigger human AD will require means of predicting which peptides might be recognised by autoimmune T-cell receptors (TCRs). Recent developments in high throughput sequencing and bioinformatics mean that it is now possible to link individual TCRs to specific pathologies for the first time. Deconvolution of TCR function requires knowledge of TCR specificity. Positional Scanning Combinatorial Peptide Libraries (PS-CPLs) can be used to predict HLA-restriction and define antigenic peptides derived from self and pathogen proteins. In silico search of the known terrestrial proteome with a prediction algorithm that ranks potential antigens in order of recognition likelihood requires complex, large-scale computations over several days that are infeasible on a personal computer. We decreased the time required for peptide searching to under 30 min using multiple blocks on graphics processing units (GPUs). This time-efficient, cost-effective hardware accelerator was used to screen bacterial and fungal human pathogens for peptide sequences predicted to activate a T-cell clone, InsB4, that was isolated from a patient with type 1 diabetes and recognised the insulin B-derived epitope HLVEALYLV in the context of disease-risk allele HLA A*0201. InsB4 was shown to kill HLA A*0201+ human insulin producing β-cells demonstrating that T-cells with this specificity might contribute to disease. The GPU-accelerated algorithm and multispecies pathogen proteomic databases were validated to discover pathogen-derived peptide sequences that acted as super-agonists for the InsB4 T-cell clone. Peptide-MHC tetramer binding and surface plasmon resonance were used to confirm that the InsB4 TCR bound to the highest-ranked peptide agonists derived from infectious bacteria and fungi. Adoption of GPU-accelerated prediction of T-cell agonists has the capacity to revolutionise our understanding of AD by identifying potential targets for autoimmune T-cells. This approach has further potential for dissecting T-cell responses to infectious disease and cancer.
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Affiliation(s)
- Thomas Whalley
- Cardiff University School of Medicine, Cardiff, United Kingdom.,Systems Immunity Research Institute, Cardiff University, Cardiff, United Kingdom
| | - Garry Dolton
- Cardiff University School of Medicine, Cardiff, United Kingdom
| | - Paul E Brown
- Zeeman Institute for Systems Biology and Infectious Disease Epidemiology Research, University of Warwick Coventry, Coventry, United Kingdom
| | - Aaron Wall
- Cardiff University School of Medicine, Cardiff, United Kingdom
| | - Linda Wooldridge
- Faculty of Health Sciences, University of Bristol, Bristol, United Kingdom
| | - Hugo van den Berg
- Mathematics Institute, University of Warwick, Coventry, United Kingdom
| | - Anna Fuller
- Cardiff University School of Medicine, Cardiff, United Kingdom
| | - Jade R Hopkins
- Cardiff University School of Medicine, Cardiff, United Kingdom
| | | | - Meriem Attaf
- Cardiff University School of Medicine, Cardiff, United Kingdom
| | - Robin R Knight
- Peter Gorer Department of Immunobiology, Guy's Hospital, London, United Kingdom
| | - David K Cole
- Cardiff University School of Medicine, Cardiff, United Kingdom
| | - Mark Peakman
- Peter Gorer Department of Immunobiology, Guy's Hospital, London, United Kingdom
| | - Andrew K Sewell
- Cardiff University School of Medicine, Cardiff, United Kingdom.,Systems Immunity Research Institute, Cardiff University, Cardiff, United Kingdom
| | - Barbara Szomolay
- Cardiff University School of Medicine, Cardiff, United Kingdom.,Systems Immunity Research Institute, Cardiff University, Cardiff, United Kingdom
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8
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Cole DK, Fuller A, Dolton G, Zervoudi E, Legut M, Miles K, Blanchfield L, Madura F, Holland CJ, Bulek AM, Bridgeman JS, Miles JJ, Schauenburg AJA, Beck K, Evavold BD, Rizkallah PJ, Sewell AK. Dual Molecular Mechanisms Govern Escape at Immunodominant HLA A2-Restricted HIV Epitope. Front Immunol 2017; 8:1503. [PMID: 29209312 PMCID: PMC5701626 DOI: 10.3389/fimmu.2017.01503] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2017] [Accepted: 10/25/2017] [Indexed: 12/05/2022] Open
Abstract
Serial accumulation of mutations to fixation in the SLYNTVATL (SL9) immunodominant, HIV p17 Gag-derived, HLA A2-restricted cytotoxic T lymphocyte epitope produce the SLFNTIAVL triple mutant “ultimate” escape variant. These mutations in solvent-exposed residues are believed to interfere with TCR recognition, although confirmation has awaited structural verification. Here, we solved a TCR co-complex structure with SL9 and the triple escape mutant to determine the mechanism of immune escape in this eminent system. We show that, in contrast to prevailing hypotheses, the main TCR contact residue is 4N and the dominant mechanism of escape is not via lack of TCR engagement. Instead, mutation of solvent-exposed residues in the peptide destabilise the peptide–HLA and reduce peptide density at the cell surface. These results highlight the extraordinary lengths that HIV employs to evade detection by high-affinity TCRs with a broad peptide-binding footprint and necessitate re-evaluation of this exemplar model of HIV TCR escape.
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Affiliation(s)
- David K Cole
- Cardiff University School of Medicine, University Hospital, Heath Park, Cardiff, United Kingdom
| | - Anna Fuller
- Cardiff University School of Medicine, University Hospital, Heath Park, Cardiff, United Kingdom
| | - Garry Dolton
- Cardiff University School of Medicine, University Hospital, Heath Park, Cardiff, United Kingdom
| | - Efthalia Zervoudi
- Cardiff University School of Medicine, University Hospital, Heath Park, Cardiff, United Kingdom
| | - Mateusz Legut
- Cardiff University School of Medicine, University Hospital, Heath Park, Cardiff, United Kingdom
| | - Kim Miles
- Cardiff University School of Medicine, University Hospital, Heath Park, Cardiff, United Kingdom
| | - Lori Blanchfield
- Department of Microbiology and Immunology, Emory University, Atlanta, GA, United States
| | - Florian Madura
- Cardiff University School of Medicine, University Hospital, Heath Park, Cardiff, United Kingdom
| | - Christopher J Holland
- Cardiff University School of Medicine, University Hospital, Heath Park, Cardiff, United Kingdom
| | - Anna M Bulek
- Cardiff University School of Medicine, University Hospital, Heath Park, Cardiff, United Kingdom
| | - John S Bridgeman
- Cardiff University School of Medicine, University Hospital, Heath Park, Cardiff, United Kingdom
| | - John J Miles
- Cardiff University School of Medicine, University Hospital, Heath Park, Cardiff, United Kingdom.,James Cook University, Cairns, QLD, Australia
| | - Andrea J A Schauenburg
- Cardiff University School of Medicine, University Hospital, Heath Park, Cardiff, United Kingdom
| | - Konrad Beck
- Cardiff University School of Dentistry, University Hospital, Heath Park, Cardiff, United Kingdom
| | - Brian D Evavold
- Department of Microbiology and Immunology, Emory University, Atlanta, GA, United States
| | - Pierre J Rizkallah
- Cardiff University School of Medicine, University Hospital, Heath Park, Cardiff, United Kingdom
| | - Andrew K Sewell
- Cardiff University School of Medicine, University Hospital, Heath Park, Cardiff, United Kingdom
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9
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Williams CM, Schonnesen AA, Zhang SQ, Ma KY, He C, Yamamoto T, Eckhardt SG, Klebanoff CA, Jiang N. Normalized Synergy Predicts That CD8 Co-Receptor Contribution to T Cell Receptor (TCR) and pMHC Binding Decreases As TCR Affinity Increases in Human Viral-Specific T Cells. Front Immunol 2017; 8:894. [PMID: 28804489 PMCID: PMC5532383 DOI: 10.3389/fimmu.2017.00894] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2017] [Accepted: 07/12/2017] [Indexed: 11/13/2022] Open
Abstract
The discovery of naturally occurring T cell receptors (TCRs) that confer specific, high-affinity recognition of pathogen and cancer-associated antigens remains a major goal in cellular immunotherapies. The contribution of the CD8 co-receptor to the interaction between the TCR and peptide-bound major histocompatibility complex (pMHC) has previously been correlated with the activation and responsiveness of CD8+ T cells. However, these studies have been limited to model systems of genetically engineered hybridoma TCRs or transgenic mouse TCRs against either a single epitope or an array of altered peptide ligands. CD8 contribution in a native human antigen-specific T cell response remains elusive. Here, using Hepatitis C Virus-specific precursor CTLs spanning a large range of TCR affinities, we discovered that the functional responsiveness of any given TCR correlated with the contribution of CD8 to TCR/pMHC binding. Furthermore, we found that CD8 contribution to TCR/pMHC binding in the two-dimensional (2D) system was more accurately reflected by normalized synergy (CD8 cooperation normalized by total TCR/pMHC bonds) rather than synergy (total CD8 cooperation) alone. While synergy showed an increasing trend with TCR affinity, normalized synergy was demonstrated to decrease with the increase of TCR affinity. Critically, normalized synergy was shown to correlate with CTL functionality and peptide sensitivity, corroborating three-dimensional (3D) analysis of CD8 contribution with respect to TCR affinity. In addition, we identified TCRs that were independent of CD8 for TCR/pMHC binding. Our results resolve the current discrepancy between 2D and 3D analysis on CD8 contribution to TCR/pMHC binding, and demonstrate that naturally occurring high-affinity TCRs are more capable of CD8-independent interactions that yield greater functional responsiveness even with CD8 blocking. Taken together, our data suggest that addition of the normalized synergy parameter to our previously established TCR discovery platform using 2D TCR affinity and sequence test would allow for selection of TCRs specific to any given antigen with the desirable attributes of high TCR affinity, CD8 co-receptor independence and functional superiority. Utilizing TCRs with less CD8 contribution could be beneficial for adoptive cell transfer immunotherapies using naturally occurring or genetically engineered T cells against viral or cancer-associated antigens.
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Affiliation(s)
- Chad M Williams
- Department of Biomedical Engineering, University of Texas at Austin, Austin, TX, United States
| | - Alexandra A Schonnesen
- Department of Biomedical Engineering, University of Texas at Austin, Austin, TX, United States
| | - Shu-Qi Zhang
- McKetta Department of Chemical Engineering, University of Texas at Austin, Austin, TX, United States
| | - Ke-Yue Ma
- Institute for Cell and Molecular Biology, University of Texas at Austin, Austin, TX, United States
| | - Chenfeng He
- Department of Biomedical Engineering, University of Texas at Austin, Austin, TX, United States
| | - Tori Yamamoto
- Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, United States.,Immunology Graduate Group, University of Pennsylvania, Philadelphia, PA, United States
| | - S Gail Eckhardt
- LIVESTRONG Cancer Institutes, Dell Medical School, University of Texas at Austin, Austin, TX, United States
| | - Christopher A Klebanoff
- Center for Cell Engineering, Department of Medicine, Memorial Sloan Kettering Cancer Center (MSKCC), New York, NY, United States.,Parker Institute for Cancer Immunotherapy, MSKCC, New York, NY, United States
| | - Ning Jiang
- Department of Biomedical Engineering, University of Texas at Austin, Austin, TX, United States.,Institute for Cell and Molecular Biology, University of Texas at Austin, Austin, TX, United States
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10
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Cole DK, van den Berg HA, Lloyd A, Crowther MD, Beck K, Ekeruche-Makinde J, Miles JJ, Bulek AM, Dolton G, Schauenburg AJ, Wall A, Fuller A, Clement M, Laugel B, Rizkallah PJ, Wooldridge L, Sewell AK. Structural Mechanism Underpinning Cross-reactivity of a CD8+ T-cell Clone That Recognizes a Peptide Derived from Human Telomerase Reverse Transcriptase. J Biol Chem 2016; 292:802-813. [PMID: 27903649 PMCID: PMC5247654 DOI: 10.1074/jbc.m116.741603] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2016] [Revised: 11/18/2016] [Indexed: 01/20/2023] Open
Abstract
T-cell cross-reactivity is essential for effective immune surveillance but has also been implicated as a pathway to autoimmunity. Previous studies have demonstrated that T-cell receptors (TCRs) that focus on a minimal motif within the peptide are able to facilitate a high level of T-cell cross-reactivity. However, the structural database shows that most TCRs exhibit less focused antigen binding involving contact with more peptide residues. To further explore the structural features that allow the clonally expressed TCR to functionally engage with multiple peptide-major histocompatibility complexes (pMHCs), we examined the ILA1 CD8+ T-cell clone that responds to a peptide sequence derived from human telomerase reverse transcriptase. The ILA1 TCR contacted its pMHC with a broad peptide binding footprint encompassing spatially distant peptide residues. Despite the lack of focused TCR-peptide binding, the ILA1 T-cell clone was still cross-reactive. Overall, the TCR-peptide contacts apparent in the structure correlated well with the level of degeneracy at different peptide positions. Thus, the ILA1 TCR was less tolerant of changes at peptide residues that were at, or adjacent to, key contact sites. This study provides new insights into the molecular mechanisms that control T-cell cross-reactivity with important implications for pathogen surveillance, autoimmunity, and transplant rejection.
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Affiliation(s)
- David K Cole
- From the Division of Infection and Immunity and Systems Immunity Research Institute, Cardiff University School of Medicine, Heath Park, Cardiff CF14 4XN, United Kingdom,
| | - Hugo A van den Berg
- the Mathematics Institute, University of Warwick, Coventry CV4 7AL, United Kingdom
| | - Angharad Lloyd
- From the Division of Infection and Immunity and Systems Immunity Research Institute, Cardiff University School of Medicine, Heath Park, Cardiff CF14 4XN, United Kingdom
| | - Michael D Crowther
- From the Division of Infection and Immunity and Systems Immunity Research Institute, Cardiff University School of Medicine, Heath Park, Cardiff CF14 4XN, United Kingdom
| | - Konrad Beck
- the Cardiff University School of Dentistry, Heath Park, Cardiff CF14 4XY, United Kingdom
| | - Julia Ekeruche-Makinde
- From the Division of Infection and Immunity and Systems Immunity Research Institute, Cardiff University School of Medicine, Heath Park, Cardiff CF14 4XN, United Kingdom
| | - John J Miles
- From the Division of Infection and Immunity and Systems Immunity Research Institute, Cardiff University School of Medicine, Heath Park, Cardiff CF14 4XN, United Kingdom.,the Queensland Institute of Medical Research Berghofer Medical Research Institute, Brisbane, Queensland 4029, Australia.,James Cook University, Cairns, Queensland 4870, Australia, and
| | - Anna M Bulek
- From the Division of Infection and Immunity and Systems Immunity Research Institute, Cardiff University School of Medicine, Heath Park, Cardiff CF14 4XN, United Kingdom
| | - Garry Dolton
- From the Division of Infection and Immunity and Systems Immunity Research Institute, Cardiff University School of Medicine, Heath Park, Cardiff CF14 4XN, United Kingdom
| | - Andrea J Schauenburg
- From the Division of Infection and Immunity and Systems Immunity Research Institute, Cardiff University School of Medicine, Heath Park, Cardiff CF14 4XN, United Kingdom
| | - Aaron Wall
- From the Division of Infection and Immunity and Systems Immunity Research Institute, Cardiff University School of Medicine, Heath Park, Cardiff CF14 4XN, United Kingdom
| | - Anna Fuller
- From the Division of Infection and Immunity and Systems Immunity Research Institute, Cardiff University School of Medicine, Heath Park, Cardiff CF14 4XN, United Kingdom
| | - Mathew Clement
- From the Division of Infection and Immunity and Systems Immunity Research Institute, Cardiff University School of Medicine, Heath Park, Cardiff CF14 4XN, United Kingdom
| | - Bruno Laugel
- From the Division of Infection and Immunity and Systems Immunity Research Institute, Cardiff University School of Medicine, Heath Park, Cardiff CF14 4XN, United Kingdom
| | - Pierre J Rizkallah
- From the Division of Infection and Immunity and Systems Immunity Research Institute, Cardiff University School of Medicine, Heath Park, Cardiff CF14 4XN, United Kingdom
| | - Linda Wooldridge
- the Faculty of Health Sciences, University of Bristol, Bristol BS8 1TD, United Kingdom
| | - Andrew K Sewell
- From the Division of Infection and Immunity and Systems Immunity Research Institute, Cardiff University School of Medicine, Heath Park, Cardiff CF14 4XN, United Kingdom,
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11
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Cole DK, Bulek AM, Dolton G, Schauenberg AJ, Szomolay B, Rittase W, Trimby A, Jothikumar P, Fuller A, Skowera A, Rossjohn J, Zhu C, Miles JJ, Peakman M, Wooldridge L, Rizkallah PJ, Sewell AK. Hotspot autoimmune T cell receptor binding underlies pathogen and insulin peptide cross-reactivity. J Clin Invest 2016; 126:2191-204. [PMID: 27183389 PMCID: PMC4887163 DOI: 10.1172/jci85679] [Citation(s) in RCA: 83] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2015] [Accepted: 03/10/2016] [Indexed: 12/11/2022] Open
Abstract
The cross-reactivity of T cells with pathogen- and self-derived peptides has been implicated as a pathway involved in the development of autoimmunity. However, the mechanisms that allow the clonal T cell antigen receptor (TCR) to functionally engage multiple peptide–major histocompatibility complexes (pMHC) are unclear. Here, we studied multiligand discrimination by a human, preproinsulin reactive, MHC class-I–restricted CD8+ T cell clone (1E6) that can recognize over 1 million different peptides. We generated high-resolution structures of the 1E6 TCR bound to 7 altered peptide ligands, including a pathogen-derived peptide that was an order of magnitude more potent than the natural self-peptide. Evaluation of these structures demonstrated that binding was stabilized through a conserved lock-and-key–like minimal binding footprint that enables 1E6 TCR to tolerate vast numbers of substitutions outside of this so-called hotspot. Highly potent antigens of the 1E6 TCR engaged with a strong antipathogen-like binding affinity; this engagement was governed though an energetic switch from an enthalpically to entropically driven interaction compared with the natural autoimmune ligand. Together, these data highlight how T cell cross-reactivity with pathogen-derived antigens might break self-tolerance to induce autoimmune disease.
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Affiliation(s)
- David K. Cole
- Division of Infection and Immunity and Systems Immunity Research Institute, Cardiff University School of Medicine, Heath Park, Cardiff, United Kingdom
| | - Anna M. Bulek
- Division of Infection and Immunity and Systems Immunity Research Institute, Cardiff University School of Medicine, Heath Park, Cardiff, United Kingdom
| | - Garry Dolton
- Division of Infection and Immunity and Systems Immunity Research Institute, Cardiff University School of Medicine, Heath Park, Cardiff, United Kingdom
| | - Andrea J. Schauenberg
- Division of Infection and Immunity and Systems Immunity Research Institute, Cardiff University School of Medicine, Heath Park, Cardiff, United Kingdom
| | - Barbara Szomolay
- Division of Infection and Immunity and Systems Immunity Research Institute, Cardiff University School of Medicine, Heath Park, Cardiff, United Kingdom
- Mathematics Institute, University of Warwick, Coventry, United Kingdom
| | - William Rittase
- Woodruff School of Mechanical Engineering and Coulter Department of Biomedical Engineering, Georgia Institute of Technology, Atlanta, Georgia, USA
| | - Andrew Trimby
- Division of Infection and Immunity and Systems Immunity Research Institute, Cardiff University School of Medicine, Heath Park, Cardiff, United Kingdom
| | - Prithiviraj Jothikumar
- Woodruff School of Mechanical Engineering and Coulter Department of Biomedical Engineering, Georgia Institute of Technology, Atlanta, Georgia, USA
| | - Anna Fuller
- Division of Infection and Immunity and Systems Immunity Research Institute, Cardiff University School of Medicine, Heath Park, Cardiff, United Kingdom
| | - Ania Skowera
- Department of Immunobiology, King’s College London, London, United Kingdom
- NIHR Biomedical Research Centre at Guy’s and St Thomas’ NHS Foundation Trust and King’s College London, London, United Kingdom
| | - Jamie Rossjohn
- Division of Infection and Immunity and Systems Immunity Research Institute, Cardiff University School of Medicine, Heath Park, Cardiff, United Kingdom
- Department of Biochemistry and Molecular Biology, School of Biomedical Sciences, and
- ARC Centre of Excellence in Advanced Molecular Imaging, Monash University, Clayton, Victoria, Australia
| | - Cheng Zhu
- Woodruff School of Mechanical Engineering and Coulter Department of Biomedical Engineering, Georgia Institute of Technology, Atlanta, Georgia, USA
- Coulter Department of Biomedical Engineering, Georgia Institute of Technology, Atlanta, Georgia, USA
| | - John J. Miles
- Division of Infection and Immunity and Systems Immunity Research Institute, Cardiff University School of Medicine, Heath Park, Cardiff, United Kingdom
- QIMR Berghofer Medical Research Institute, Brisbane, Queensland, Australia
| | - Mark Peakman
- Department of Immunobiology, King’s College London, London, United Kingdom
- NIHR Biomedical Research Centre at Guy’s and St Thomas’ NHS Foundation Trust and King’s College London, London, United Kingdom
| | - Linda Wooldridge
- Faculty of Health Sciences, University of Bristol, Bristol, United Kingdom
| | - Pierre J. Rizkallah
- Division of Infection and Immunity and Systems Immunity Research Institute, Cardiff University School of Medicine, Heath Park, Cardiff, United Kingdom
| | - Andrew K. Sewell
- Division of Infection and Immunity and Systems Immunity Research Institute, Cardiff University School of Medicine, Heath Park, Cardiff, United Kingdom
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12
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Raman MCC, Rizkallah PJ, Simmons R, Donnellan Z, Dukes J, Bossi G, Le Provost GS, Todorov P, Baston E, Hickman E, Mahon T, Hassan N, Vuidepot A, Sami M, Cole DK, Jakobsen BK. Direct molecular mimicry enables off-target cardiovascular toxicity by an enhanced affinity TCR designed for cancer immunotherapy. Sci Rep 2016; 6:18851. [PMID: 26758806 PMCID: PMC4725365 DOI: 10.1038/srep18851] [Citation(s) in RCA: 69] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2015] [Accepted: 11/27/2015] [Indexed: 12/11/2022] Open
Abstract
Natural T-cell responses generally lack the potency to eradicate cancer. Enhanced affinity T-cell receptors (TCRs) provide an ideal approach to target cancer cells, with emerging clinical data showing significant promise. Nevertheless, the risk of off target reactivity remains a key concern, as exemplified in a recent clinical report describing fatal cardiac toxicity, following administration of MAGE-A3 specific TCR-engineered T-cells, mediated through cross-reactivity with an unrelated epitope from the Titin protein presented on cardiac tissue. Here, we investigated the structural mechanism enabling TCR cross-recognition of MAGE-A3 and Titin, and applied the resulting data to rationally design mutants with improved antigen discrimination, providing a proof-of-concept strategy for altering the fine specificity of a TCR towards an intended target antigen. This study represents the first example of direct molecular mimicry leading to clinically relevant fatal toxicity, mediated by a modified enhanced affinity TCR designed for cancer immunotherapy. Furthermore, these data demonstrate that self-antigens that are expressed at high levels on healthy tissue should be treated with extreme caution when designing immuno-therapeutics.
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MESH Headings
- Antigen Presentation
- Antigen-Presenting Cells/immunology
- Antigen-Presenting Cells/metabolism
- Antigens, Neoplasm/chemistry
- Antigens, Neoplasm/genetics
- Antigens, Neoplasm/immunology
- Antigens, Neoplasm/metabolism
- Cardiotoxicity
- Cell Line
- Connectin/chemistry
- Connectin/immunology
- Connectin/metabolism
- Cross Reactions/immunology
- Epitopes, T-Lymphocyte/chemistry
- Epitopes, T-Lymphocyte/immunology
- Genetic Engineering
- Humans
- Immunotherapy/adverse effects
- Immunotherapy/methods
- Models, Molecular
- Molecular Mimicry
- Mutation
- Neoplasm Proteins/genetics
- Neoplasm Proteins/immunology
- Neoplasm Proteins/metabolism
- Peptide Fragments/chemistry
- Peptide Fragments/immunology
- Protein Binding/immunology
- Protein Conformation
- Receptors, Antigen, T-Cell/genetics
- Receptors, Antigen, T-Cell/metabolism
- Receptors, Antigen, T-Cell, alpha-beta/genetics
- Receptors, Antigen, T-Cell, alpha-beta/metabolism
- T-Cell Antigen Receptor Specificity/immunology
- T-Lymphocyte Subsets/immunology
- T-Lymphocyte Subsets/metabolism
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Affiliation(s)
- Marine C C Raman
- Immunocore Limited, 101 Park Drive, Milton Park, Abingdon, Oxon, OX14 4RX, United Kingdom
| | - Pierre J Rizkallah
- Division of Infection and Immunity, Cardiff University School of Medicine, Henry Wellcome building, Heath Park, Cardiff, CF14 4XN, United Kingdom
| | - Ruth Simmons
- Immunocore Limited, 101 Park Drive, Milton Park, Abingdon, Oxon, OX14 4RX, United Kingdom
| | - Zoe Donnellan
- Immunocore Limited, 101 Park Drive, Milton Park, Abingdon, Oxon, OX14 4RX, United Kingdom
| | - Joseph Dukes
- Immunocore Limited, 101 Park Drive, Milton Park, Abingdon, Oxon, OX14 4RX, United Kingdom
| | - Giovanna Bossi
- Immunocore Limited, 101 Park Drive, Milton Park, Abingdon, Oxon, OX14 4RX, United Kingdom
| | - Gabrielle S Le Provost
- Immunocore Limited, 101 Park Drive, Milton Park, Abingdon, Oxon, OX14 4RX, United Kingdom
| | - Penio Todorov
- Immunocore Limited, 101 Park Drive, Milton Park, Abingdon, Oxon, OX14 4RX, United Kingdom
| | - Emma Baston
- Immunocore Limited, 101 Park Drive, Milton Park, Abingdon, Oxon, OX14 4RX, United Kingdom
| | - Emma Hickman
- Immunocore Limited, 101 Park Drive, Milton Park, Abingdon, Oxon, OX14 4RX, United Kingdom
| | - Tara Mahon
- Immunocore Limited, 101 Park Drive, Milton Park, Abingdon, Oxon, OX14 4RX, United Kingdom
| | - Namir Hassan
- Immunocore Limited, 101 Park Drive, Milton Park, Abingdon, Oxon, OX14 4RX, United Kingdom
| | - Annelise Vuidepot
- Immunocore Limited, 101 Park Drive, Milton Park, Abingdon, Oxon, OX14 4RX, United Kingdom
| | - Malkit Sami
- Immunocore Limited, 101 Park Drive, Milton Park, Abingdon, Oxon, OX14 4RX, United Kingdom
| | - David K Cole
- Division of Infection and Immunity, Cardiff University School of Medicine, Henry Wellcome building, Heath Park, Cardiff, CF14 4XN, United Kingdom
| | - Bent K. Jakobsen
- Immunocore Limited, 101 Park Drive, Milton Park, Abingdon, Oxon, OX14 4RX, United Kingdom
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13
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Rashin AA, Jernigan RL. Clusters of Structurally Similar MHC I HLA-A2 Molecules, Found with a New Method, Suggest Mechanisms of T-Cell Receptor Avidity. Biochemistry 2016; 55:167-85. [PMID: 26600404 DOI: 10.1021/acs.biochem.5b01077] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Only α1 and α2 domains of the α-chain of the major histocompatibility complex (MHC) directly bind peptide antigens (Ag-s) and the T-cell receptor (TCR). Significant plasticity was found in the TCR but only minor in (α1 + α2). The α3-domain position variation was noted only in connection to its binding the coreceptor CD8. We apply our methods for identifying functional conformational changes in proteins to a systematic study of similarities between 43 X-ray structures of the entire α chains of MHC-I HLA-A2. Out of 903 different αHLA-A2 pairs 203 show similarities within the earlier determined uncertainty threshold and unexpectedly form three similarity clusters (SCs) with all/most structures in a cluster similar within the uncertainty threshold. Pairs from different SCs always differ above the threshold, mainly due to variations in the α3 position/structure. All structures in SC3 cannot bind the CD8 coreceptor. Strong hydrogen bonds between (α1 + α2) and α3 differ between SC1 and SC2 but are nearly invariant within each SC. Small conformational changes in the (α1 + α2), caused by Ag-s differences, act as an α3 "allosteric switch" between SC2 and SC1. Binding of CD8 to SC2-HLA-A2 (Tax-type Ag-s) changes it to SC1-HLA-A2 (HuD-type Ag-s). HuD binding to HLA-A2 is much less stable than Tax binding. CD8-liganded HLA-A2 preference for binding HuD suggests that CD8-HLA-A2 may present a weakly binding peptide for TCR recognition, supporting the hypothesis that CD8 increases TCR avidity to weak Ag-s. Other HLA-A2 functions may involve α3. TCR-A6-liganded-Tax-type-HLA-A2s form two small clusters, similar to either A6-liganded-HuD or A6-liganded-native-Tax HLA-A2s.
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Affiliation(s)
- Alexander A Rashin
- BioChemComp Inc , 543 Sagamore Avenue, Teaneck, New Jersey 07666, United States
- LH Baker Center for Bioinformatics and Department of Biochemistry, Biophysics and Molecular Biology, 112 Office and Lab Building, Iowa State University , Ames, Iowa 50011-3020, United States
| | - Robert L Jernigan
- LH Baker Center for Bioinformatics and Department of Biochemistry, Biophysics and Molecular Biology, 112 Office and Lab Building, Iowa State University , Ames, Iowa 50011-3020, United States
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14
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Holland CJ, Dolton G, Scurr M, Ladell K, Schauenburg AJ, Miners K, Madura F, Sewell AK, Price DA, Cole DK, Godkin AJ. Enhanced Detection of Antigen-Specific CD4+ T Cells Using Altered Peptide Flanking Residue Peptide-MHC Class II Multimers. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2015; 195:5827-36. [PMID: 26553072 PMCID: PMC4671089 DOI: 10.4049/jimmunol.1402787] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/07/2014] [Accepted: 10/08/2015] [Indexed: 11/22/2022]
Abstract
Fluorochrome-conjugated peptide-MHC (pMHC) class I multimers are staple components of the immunologist's toolbox, enabling reliable quantification and analysis of Ag-specific CD8(+) T cells irrespective of functional outputs. In contrast, widespread use of the equivalent pMHC class II (pMHC-II) reagents has been hindered by intrinsically weaker TCR affinities for pMHC-II, a lack of cooperative binding between the TCR and CD4 coreceptor, and a low frequency of Ag-specific CD4(+) T cell populations in the peripheral blood. In this study, we show that peptide flanking regions, extending beyond the central nonamer core of MHC-II-bound peptides, can enhance TCR-pMHC-II binding and T cell activation without loss of specificity. Consistent with these findings, pMHC-II multimers incorporating peptide flanking residue modifications proved superior for the ex vivo detection, characterization, and manipulation of Ag-specific CD4(+) T cells, highlighting an unappreciated feature of TCR-pMHC-II interactions.
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Affiliation(s)
- Christopher J Holland
- Division of Infection and Immunity, Cardiff University School of Medicine, Cardiff CF14 4XN, Wales, United Kingdom; and
| | - Garry Dolton
- Division of Infection and Immunity, Cardiff University School of Medicine, Cardiff CF14 4XN, Wales, United Kingdom; and
| | - Martin Scurr
- Division of Infection and Immunity, Cardiff University School of Medicine, Cardiff CF14 4XN, Wales, United Kingdom; and
| | - Kristin Ladell
- Division of Infection and Immunity, Cardiff University School of Medicine, Cardiff CF14 4XN, Wales, United Kingdom; and
| | - Andrea J Schauenburg
- Division of Infection and Immunity, Cardiff University School of Medicine, Cardiff CF14 4XN, Wales, United Kingdom; and
| | - Kelly Miners
- Division of Infection and Immunity, Cardiff University School of Medicine, Cardiff CF14 4XN, Wales, United Kingdom; and
| | - Florian Madura
- Division of Infection and Immunity, Cardiff University School of Medicine, Cardiff CF14 4XN, Wales, United Kingdom; and
| | - Andrew K Sewell
- Division of Infection and Immunity, Cardiff University School of Medicine, Cardiff CF14 4XN, Wales, United Kingdom; and
| | - David A Price
- Division of Infection and Immunity, Cardiff University School of Medicine, Cardiff CF14 4XN, Wales, United Kingdom; and
| | - David K Cole
- Division of Infection and Immunity, Cardiff University School of Medicine, Cardiff CF14 4XN, Wales, United Kingdom; and
| | - Andrew J Godkin
- Division of Infection and Immunity, Cardiff University School of Medicine, Cardiff CF14 4XN, Wales, United Kingdom; and Department of Integrated Medicine, University Hospital of Wales, Cardiff CF14 4XW, Wales, United Kingdom
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15
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Motozono C, Pearson JA, De Leenheer E, Rizkallah PJ, Beck K, Trimby A, Sewell AK, Wong FS, Cole DK. Distortion of the Major Histocompatibility Complex Class I Binding Groove to Accommodate an Insulin-derived 10-Mer Peptide. J Biol Chem 2015; 290:18924-33. [PMID: 26085090 PMCID: PMC4521012 DOI: 10.1074/jbc.m114.622522] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2014] [Revised: 06/12/2015] [Indexed: 01/23/2023] Open
Abstract
The non-obese diabetic mouse model of type 1 diabetes continues to be an important tool for delineating the role of T-cell-mediated destruction of pancreatic β-cells. However, little is known about the molecular mechanisms that enable this disease pathway. We show that insulin reactivity by a CD8(+) T-cell clone, known to induce type 1 diabetes, is characterized by weak T-cell antigen receptor binding to a relatively unstable peptide-MHC. The structure of the native 9- and 10-mer insulin epitopes demonstrated that peptide residues 7 and 8 form a prominent solvent-exposed bulge that could potentially be the main focus of T-cell receptor binding. The C terminus of the peptide governed peptide-MHC stability. Unexpectedly, we further demonstrate a novel mode of flexible peptide presentation in which the MHC peptide-binding groove is able to "open the back door" to accommodate extra C-terminal peptide residues.
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Affiliation(s)
- Chihiro Motozono
- From the Division of Infection and Immunity and the Department of Immunology, Kinki University School of Medicine, Osaka 589-8511, Japan, and
| | - James A Pearson
- the Institute of Molecular and Experimental Medicine, Cardiff University School of Medicine, Heath Park, Cardiff CF14 4XN, United Kingdom
| | - Evy De Leenheer
- the Institute of Molecular and Experimental Medicine, Cardiff University School of Medicine, Heath Park, Cardiff CF14 4XN, United Kingdom
| | | | - Konrad Beck
- the Cardiff University School of Dentistry, Heath Park, Cardiff CF14 4XY, United Kingdom
| | | | | | - F Susan Wong
- the Institute of Molecular and Experimental Medicine, Cardiff University School of Medicine, Heath Park, Cardiff CF14 4XN, United Kingdom,
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16
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Kløverpris HN, Cole DK, Fuller A, Carlson J, Beck K, Schauenburg AJ, Rizkallah PJ, Buus S, Sewell AK, Goulder P. A molecular switch in immunodominant HIV-1-specific CD8 T-cell epitopes shapes differential HLA-restricted escape. Retrovirology 2015; 12:20. [PMID: 25808313 PMCID: PMC4347545 DOI: 10.1186/s12977-015-0149-5] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2014] [Accepted: 01/29/2015] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Presentation of identical HIV-1 peptides by closely related Human Leukocyte Antigen class I (HLAI) molecules can select distinct patterns of escape mutation that have a significant impact on viral fitness and disease progression. The molecular mechanisms by which HLAI micropolymorphisms can induce differential HIV-1 escape patterns within identical peptide epitopes remain unknown. RESULTS Here, we undertook genetic and structural analyses of two immunodominant HIV-1 peptides, Gag180-188 (TPQDLNTML, TL9-p24) and Nef71-79 (RPQVPLRPM, RM9-Nef) that are among the most highly targeted epitopes in the global HIV-1 epidemic. We show that single polymorphisms between different alleles of the HLA-B7 superfamily can induce a conformational switch in peptide conformation that is associated with differential HLAI-specific escape mutation and immune control. A dominant R71K mutation in the Nef71-79 occurred in those with HLA-B*07:02 but not B*42:01/02 or B*81:01. No structural difference in the HLA-epitope complexes was detected to explain this observation. CONCLUSIONS These data suggest that identical peptides presented through very similar HLAI landscapes are recognized as distinct epitopes and provide a novel structural mechanism for previously observed differential HIV-1 escape and disease progression.
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Affiliation(s)
- Henrik N Kløverpris
- />KwaZulu- Natal Research Institute for Tuberculosis and HIV, K-RITH, Nelson R Mandela School of Medicine, University of KwaZulu-Natal, Durban, South Africa
- />Department of International Health, Immunology and Microbiology, University of Copenhagen, Copenhagen N, 2200 Denmark
- />Department of Paediatrics, University of Oxford, Peter Medawar Building, Oxford, OX1 3SY UK
| | - David K Cole
- />Cardiff University School of Medicine, Heath Park, Cardiff, UK
| | - Anna Fuller
- />Cardiff University School of Medicine, Heath Park, Cardiff, UK
| | | | - Konrad Beck
- />Cardiff University School of Dentistry, Heath Park, Cardiff, UK
| | | | | | - Søren Buus
- />Department of International Health, Immunology and Microbiology, University of Copenhagen, Copenhagen N, 2200 Denmark
| | - Andrew K Sewell
- />Cardiff University School of Medicine, Heath Park, Cardiff, UK
| | - Philip Goulder
- />Department of Paediatrics, University of Oxford, Peter Medawar Building, Oxford, OX1 3SY UK
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17
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Madura F, Rizkallah PJ, Holland CJ, Fuller A, Bulek A, Godkin AJ, Schauenburg AJ, Cole DK, Sewell AK. Structural basis for ineffective T-cell responses to MHC anchor residue-improved "heteroclitic" peptides. Eur J Immunol 2015; 45:584-91. [PMID: 25471691 PMCID: PMC4357396 DOI: 10.1002/eji.201445114] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2014] [Revised: 10/03/2014] [Accepted: 11/26/2014] [Indexed: 12/11/2022]
Abstract
MHC anchor residue-modified "heteroclitic" peptides have been used in many cancer vaccine trials and often induce greater immune responses than the wild-type peptide. The best-studied system to date is the decamer MART-1/Melan-A26-35 peptide, EAAGIGILTV, where the natural alanine at position 2 has been modified to leucine to improve human leukocyte antigen (HLA)-A*0201 anchoring. The resulting ELAGIGILTV peptide has been used in many studies. We recently showed that T cells primed with the ELAGIGILTV peptide can fail to recognize the natural tumor-expressed peptide efficiently, thereby providing a potential molecular reason for why clinical trials of this peptide have been unsuccessful. Here, we solved the structure of a TCR in complex with HLA-A*0201-EAAGIGILTV peptide and compared it with its heteroclitic counterpart , HLA-A*0201-ELAGIGILTV. The data demonstrate that a suboptimal anchor residue at position 2 enables the TCR to "pull" the peptide away from the MHC binding groove, facilitating extra contacts with both the peptide and MHC surface. These data explain how a TCR can distinguish between two epitopes that differ by only a single MHC anchor residue and demonstrate how weak MHC anchoring can enable an induced-fit interaction with the TCR. Our findings constitute a novel demonstration of the extreme sensitivity of the TCR to minor alterations in peptide conformation.
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MESH Headings
- Alanine/chemistry
- Alanine/genetics
- Amino Acid Sequence
- Amino Acid Substitution
- Crystallography, X-Ray
- Epitopes, T-Lymphocyte/genetics
- Epitopes, T-Lymphocyte/immunology
- Epitopes, T-Lymphocyte/metabolism
- Escherichia coli/genetics
- Escherichia coli/metabolism
- Gene Expression
- HLA-A2 Antigen/chemistry
- HLA-A2 Antigen/genetics
- HLA-A2 Antigen/immunology
- Humans
- Leucine/chemistry
- Leucine/genetics
- MART-1 Antigen/chemistry
- MART-1 Antigen/genetics
- MART-1 Antigen/immunology
- Models, Molecular
- Molecular Sequence Data
- Peptides/chemistry
- Peptides/genetics
- Peptides/immunology
- Protein Binding
- Protein Interaction Domains and Motifs
- Receptors, Antigen, T-Cell, alpha-beta/chemistry
- Receptors, Antigen, T-Cell, alpha-beta/genetics
- Receptors, Antigen, T-Cell, alpha-beta/immunology
- Recombinant Proteins/chemistry
- Recombinant Proteins/genetics
- Recombinant Proteins/immunology
- T-Lymphocytes, Cytotoxic/cytology
- T-Lymphocytes, Cytotoxic/immunology
- T-Lymphocytes, Cytotoxic/metabolism
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Affiliation(s)
- Florian Madura
- Division of Infection and Immunity, Cardiff University School of MedicineHeath Park, Cardiff, UK
| | - Pierre J Rizkallah
- Division of Infection and Immunity, Cardiff University School of MedicineHeath Park, Cardiff, UK
| | - Christopher J Holland
- Division of Infection and Immunity, Cardiff University School of MedicineHeath Park, Cardiff, UK
| | - Anna Fuller
- Division of Infection and Immunity, Cardiff University School of MedicineHeath Park, Cardiff, UK
| | - Anna Bulek
- Division of Infection and Immunity, Cardiff University School of MedicineHeath Park, Cardiff, UK
| | - Andrew J Godkin
- Division of Infection and Immunity, Cardiff University School of MedicineHeath Park, Cardiff, UK
| | - Andrea J Schauenburg
- Division of Infection and Immunity, Cardiff University School of MedicineHeath Park, Cardiff, UK
| | - David K Cole
- Division of Infection and Immunity, Cardiff University School of MedicineHeath Park, Cardiff, UK
| | - Andrew K Sewell
- Division of Infection and Immunity, Cardiff University School of MedicineHeath Park, Cardiff, UK
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18
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Stepanek O, Prabhakar AS, Osswald C, King CG, Bulek A, Naeher D, Beaufils-Hugot M, Abanto ML, Galati V, Hausmann B, Lang R, Cole DK, Huseby ES, Sewell AK, Chakraborty AK, Palmer E. Coreceptor scanning by the T cell receptor provides a mechanism for T cell tolerance. Cell 2014; 159:333-45. [PMID: 25284152 PMCID: PMC4304671 DOI: 10.1016/j.cell.2014.08.042] [Citation(s) in RCA: 122] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2014] [Revised: 07/14/2014] [Accepted: 08/29/2014] [Indexed: 12/11/2022]
Abstract
In the thymus, high-affinity, self-reactive thymocytes are eliminated from the pool of developing T cells, generating central tolerance. Here, we investigate how developing T cells measure self-antigen affinity. We show that very few CD4 or CD8 coreceptor molecules are coupled with the signal-initiating kinase, Lck. To initiate signaling, an antigen-engaged T cell receptor (TCR) scans multiple coreceptor molecules to find one that is coupled to Lck; this is the first and rate-limiting step in a kinetic proofreading chain of events that eventually leads to TCR triggering and negative selection. MHCII-restricted TCRs require a shorter antigen dwell time (0.2 s) to initiate negative selection compared to MHCI-restricted TCRs (0.9 s) because more CD4 coreceptors are Lck-loaded compared to CD8. We generated a model (Lck come&stay/signal duration) that accurately predicts the observed differences in antigen dwell-time thresholds used by MHCI- and MHCII-restricted thymocytes to initiate negative selection and generate self-tolerance.
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Affiliation(s)
- Ondrej Stepanek
- Departments of Biomedicine and Nephrology, University Hospital Basel and University of Basel, 4031 Basel, Switzerland.
| | - Arvind S Prabhakar
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Celine Osswald
- Departments of Biomedicine and Nephrology, University Hospital Basel and University of Basel, 4031 Basel, Switzerland
| | - Carolyn G King
- Departments of Biomedicine and Nephrology, University Hospital Basel and University of Basel, 4031 Basel, Switzerland
| | - Anna Bulek
- Institute of Infection and Immunity, Cardiff University School of Medicine, Cardiff CF14 4XN, UK
| | - Dieter Naeher
- Departments of Biomedicine and Nephrology, University Hospital Basel and University of Basel, 4031 Basel, Switzerland
| | - Marina Beaufils-Hugot
- Departments of Biomedicine and Nephrology, University Hospital Basel and University of Basel, 4031 Basel, Switzerland
| | - Michael L Abanto
- Departments of Biomedicine and Nephrology, University Hospital Basel and University of Basel, 4031 Basel, Switzerland
| | - Virginie Galati
- Departments of Biomedicine and Nephrology, University Hospital Basel and University of Basel, 4031 Basel, Switzerland
| | - Barbara Hausmann
- Departments of Biomedicine and Nephrology, University Hospital Basel and University of Basel, 4031 Basel, Switzerland
| | - Rosemarie Lang
- Departments of Biomedicine and Nephrology, University Hospital Basel and University of Basel, 4031 Basel, Switzerland
| | - David K Cole
- Institute of Infection and Immunity, Cardiff University School of Medicine, Cardiff CF14 4XN, UK
| | - Eric S Huseby
- Department of Pathology, University of Massachusetts Medical School, Worcester, MA 01655, USA
| | - Andrew K Sewell
- Institute of Infection and Immunity, Cardiff University School of Medicine, Cardiff CF14 4XN, UK
| | - Arup K Chakraborty
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA; Institute for Medical Engineering and Science, Departments of Physics, Chemistry, and Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA; Ragon Institute of MGH, MIT, and Harvard, 400 Technology Square, Cambridge, MA 02139, USA
| | - Ed Palmer
- Departments of Biomedicine and Nephrology, University Hospital Basel and University of Basel, 4031 Basel, Switzerland.
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19
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Motozono C, Kuse N, Sun X, Rizkallah PJ, Fuller A, Oka S, Cole DK, Sewell AK, Takiguchi M. Molecular basis of a dominant T cell response to an HIV reverse transcriptase 8-mer epitope presented by the protective allele HLA-B*51:01. THE JOURNAL OF IMMUNOLOGY 2014; 192:3428-34. [PMID: 24600035 PMCID: PMC3962895 DOI: 10.4049/jimmunol.1302667] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
Abstract
CD8+ CTL responses directed toward the HLA-B*51:01–restricted HIV-RT128–135 epitope TAFTIPSI (TI8) are associated with long-term nonprogression to AIDS. Clonotypic analysis of responses to B51-TI8 revealed a public clonotype using TRAV17/TRBV7-3 TCR genes in six out of seven HLA-B*51:01+ patients. Structural analysis of a TRAV17/TRBV7-3 TCR in complex with HLA–B51-TI8, to our knowledge the first human TCR complexed with an 8-mer peptide, explained this bias, as the unique combination of residues encoded by these genes was central to the interaction. The relatively featureless peptide-MHC (pMHC) was mainly recognized by the TCR CDR1 and CDR2 loops in an MHC-centric manner. A highly conserved residue Arg97 in the CDR3α loop played a major role in recognition of peptide and MHC to form a stabilizing ball-and-socket interaction with the MHC and peptide, contributing to the selection of the public TCR clonotype. Surface plasmon resonance equilibrium binding analysis showed the low affinity of this public TCR is in accordance with the only other 8-mer interaction studied to date (murine 2C TCR–H-2Kb-dEV8). Like pMHC class II complexes, 8-mer peptides do not protrude out the MHC class I binding groove like those of longer peptides. The accumulated evidence suggests that weak affinity might be a common characteristic of TCR binding to featureless pMHC landscapes.
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Affiliation(s)
- Chihiro Motozono
- Cardiff University School of Medicine, Heath Park CF14 4XN, United Kingdom
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20
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Cole DK, Miles KM, Madura F, Holland CJ, Schauenburg AJA, Godkin AJ, Bulek AM, Fuller A, Akpovwa HJE, Pymm PG, Liddy N, Sami M, Li Y, Rizkallah PJ, Jakobsen BK, Sewell AK. T-cell receptor (TCR)-peptide specificity overrides affinity-enhancing TCR-major histocompatibility complex interactions. J Biol Chem 2014; 289:628-38. [PMID: 24196962 PMCID: PMC3887192 DOI: 10.1074/jbc.m113.522110] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2013] [Revised: 10/22/2013] [Indexed: 11/17/2022] Open
Abstract
αβ T-cell receptors (TCRs) engage antigens using complementarity-determining region (CDR) loops that are either germ line-encoded (CDR1 and CDR2) or somatically rearranged (CDR3). TCR ligands compose a presentation platform (major histocompatibility complex (MHC)) and a variable antigenic component consisting of a short "foreign" peptide. The sequence of events when the TCR engages its peptide-MHC (pMHC) ligand remains unclear. Some studies suggest that the germ line elements of the TCR engage the MHC prior to peptide scanning, but this order of binding is difficult to reconcile with some TCR-pMHC structures. Here, we used TCRs that exhibited enhanced pMHC binding as a result of mutations in either CDR2 and/or CDR3 loops, that bound to the MHC or peptide, respectively, to dissect the roles of these loops in stabilizing TCR-pMHC interactions. Our data show that TCR-peptide interactions play a strongly dominant energetic role providing a binding mode that is both temporally and energetically complementary with a system requiring positive selection by self-pMHC in the thymus and rapid recognition of non-self-pMHC in the periphery.
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MESH Headings
- Amino Acid Sequence
- Binding, Competitive
- Complementarity Determining Regions/chemistry
- Complementarity Determining Regions/genetics
- Complementarity Determining Regions/metabolism
- Crystallography, X-Ray
- HLA Antigens/chemistry
- HLA Antigens/genetics
- HLA Antigens/metabolism
- HLA-A2 Antigen/chemistry
- HLA-A2 Antigen/genetics
- HLA-A2 Antigen/metabolism
- Humans
- Kinetics
- Ligands
- Models, Molecular
- Molecular Sequence Data
- Mutation
- Oligopeptides/chemistry
- Oligopeptides/metabolism
- Peptides/chemistry
- Peptides/metabolism
- Protein Binding
- Protein Structure, Tertiary
- Receptors, Antigen, T-Cell/chemistry
- Receptors, Antigen, T-Cell/genetics
- Receptors, Antigen, T-Cell/metabolism
- T-Cell Antigen Receptor Specificity
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Affiliation(s)
- David K. Cole
- From Cardiff University School of Medicine, Heath Park, Cardiff CF14 4XN
| | - Kim M. Miles
- From Cardiff University School of Medicine, Heath Park, Cardiff CF14 4XN
| | - Florian Madura
- From Cardiff University School of Medicine, Heath Park, Cardiff CF14 4XN
| | | | | | - Andrew J. Godkin
- From Cardiff University School of Medicine, Heath Park, Cardiff CF14 4XN
| | - Anna M. Bulek
- From Cardiff University School of Medicine, Heath Park, Cardiff CF14 4XN
| | - Anna Fuller
- From Cardiff University School of Medicine, Heath Park, Cardiff CF14 4XN
| | | | - Phillip G. Pymm
- From Cardiff University School of Medicine, Heath Park, Cardiff CF14 4XN
- the Medical Research Council Human Immunology Unit, Weatherall Institute for Molecular Medicine, University of Oxford, Oxford 0X3 9DS, and
| | - Nathaniel Liddy
- Immunocore Ltd., 57C Milton Park, Abingdon OX14 4RX, United Kingdom
| | - Malkit Sami
- Immunocore Ltd., 57C Milton Park, Abingdon OX14 4RX, United Kingdom
| | - Yi Li
- Immunocore Ltd., 57C Milton Park, Abingdon OX14 4RX, United Kingdom
| | | | - Bent K. Jakobsen
- Immunocore Ltd., 57C Milton Park, Abingdon OX14 4RX, United Kingdom
| | - Andrew K. Sewell
- From Cardiff University School of Medicine, Heath Park, Cardiff CF14 4XN
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21
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Stone JD, Kranz DM. Role of T cell receptor affinity in the efficacy and specificity of adoptive T cell therapies. Front Immunol 2013; 4:244. [PMID: 23970885 PMCID: PMC3748443 DOI: 10.3389/fimmu.2013.00244] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2013] [Accepted: 08/05/2013] [Indexed: 01/09/2023] Open
Abstract
Over the last several years, there has been considerable progress in the treatment of cancer using gene modified adoptive T cell therapies. Two approaches have been used, one involving the introduction of a conventional αβ T cell receptor (TCR) against a pepMHC cancer antigen, and the second involving introduction of a chimeric antigen receptor (CAR) consisting of a single-chain antibody as an Fv fragment linked to transmembrane and signaling domains. In this review, we focus on one aspect of TCR-mediated adoptive T cell therapies, the impact of the affinity of the αβ TCR for the pepMHC cancer antigen on both efficacy and specificity. We discuss the advantages of higher-affinity TCRs in mediating potent activity of CD4 T cells. This is balanced with the potential disadvantage of higher-affinity TCRs in mediating greater self-reactivity against a wider range of structurally similar antigenic peptides, especially in synergy with the CD8 co-receptor. Both TCR affinity and target selection will influence potential safety issues. We suggest pre-clinical strategies that might be used to examine each TCR for possible on-target and off-target side effects due to self-reactivities, and to adjust TCR affinities accordingly.
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Affiliation(s)
- Jennifer D Stone
- Department of Biochemistry, University of Illinois , Urbana, IL , USA
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22
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Li Y, Yin Y, Mariuzza RA. Structural and biophysical insights into the role of CD4 and CD8 in T cell activation. Front Immunol 2013; 4:206. [PMID: 23885256 PMCID: PMC3717711 DOI: 10.3389/fimmu.2013.00206] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2013] [Accepted: 07/08/2013] [Indexed: 11/19/2022] Open
Abstract
T cell receptors (TCRs) recognize peptides presented by MHC molecules (pMHC) on an antigen-presenting cell (APC) to discriminate foreign from self-antigens and initiate adaptive immune responses. In addition, T cell activation generally requires binding of this same pMHC to a CD4 or CD8 co-receptor, resulting in assembly of a TCR–pMHC–CD4 or TCR–pMHC–CD8 complex and recruitment of Lck via its association with the co-receptor. Here we review structural and biophysical studies of CD4 and CD8 interactions with MHC molecules and TCR–pMHC complexes. Crystal structures have been determined of CD8αα and CD8αβ in complex with MHC class I, of CD4 bound to MHC class II, and of a complete TCR–pMHC–CD4 ternary complex. Additionally, the binding of these co-receptors to pMHC and TCR–pMHC ligands has been investigated both in solution and in situ at the T cell–APC interface. Together, these studies have provided key insights into the role of CD4 and CD8 in T cell activation, and into how these co-receptors focus TCR on MHC to guide TCR docking on pMHC during thymic T cell selection.
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Affiliation(s)
- Yili Li
- W. M. Keck Laboratory for Structural Biology, Institute for Bioscience and Biotechnology Research, University of Maryland , Rockville, MD , USA ; Department of Cell Biology and Molecular Genetics, University of Maryland , College Park, MD , USA
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23
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Cole DK, Sami M, Scott DR, Rizkallah PJ, Borbulevych OY, Todorov PT, Moysey RK, Jakobsen BK, Boulter JM, Baker BM, Yi Li. Increased Peptide Contacts Govern High Affinity Binding of a Modified TCR Whilst Maintaining a Native pMHC Docking Mode. Front Immunol 2013; 4:168. [PMID: 23805144 PMCID: PMC3693486 DOI: 10.3389/fimmu.2013.00168] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2013] [Accepted: 06/12/2013] [Indexed: 12/15/2022] Open
Abstract
Natural T cell receptors (TCRs) generally bind to their cognate pMHC molecules with weak affinity and fast kinetics, limiting their use as therapeutic agents. Using phage display, we have engineered a high affinity version of the A6 wild-type TCR (A6wt), specific for the human leukocyte antigen (HLA-A∗0201) complexed with human T cell lymphotropic virus type 111–19 peptide (A2-Tax). Mutations in just 4 residues in the CDR3β loop region of the A6wt TCR were selected that improved binding to A2-Tax by nearly 1000-fold. Biophysical measurements of this mutant TCR (A6c134) demonstrated that the enhanced binding was derived through favorable enthalpy and a slower off-rate. The structure of the free A6c134 TCR and the A6c134/A2-Tax complex revealed a native binding mode, similar to the A6wt/A2-Tax complex. However, concordant with the more favorable binding enthalpy, the A6c134 TCR made increased contacts with the Tax peptide compared with the A6wt/A2-Tax complex, demonstrating a peptide-focused mechanism for the enhanced affinity that directly involved the mutated residues in the A6c134 TCR CDR3β loop. This peptide-focused enhanced TCR binding may represent an important approach for developing antigen specific high affinity TCR reagents for use in T cell based therapies.
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Affiliation(s)
- David K Cole
- Cardiff University School of Medicine, Heath Park , Cardiff , UK
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24
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Madura F, Rizkallah PJ, Miles KM, Holland CJ, Bulek AM, Fuller A, Schauenburg AJA, Miles JJ, Liddy N, Sami M, Li Y, Hossain M, Baker BM, Jakobsen BK, Sewell AK, Cole DK. T-cell receptor specificity maintained by altered thermodynamics. J Biol Chem 2013; 288:18766-75. [PMID: 23698002 PMCID: PMC3696650 DOI: 10.1074/jbc.m113.464560] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
The T-cell receptor (TCR) recognizes peptides bound to major histocompatibility molecules (MHC) and allows T-cells to interrogate the cellular proteome for internal anomalies from the cell surface. The TCR contacts both MHC and peptide in an interaction characterized by weak affinity (KD = 100 nM to 270 μM). We used phage-display to produce a melanoma-specific TCR (α24β17) with a 30,000-fold enhanced binding affinity (KD = 0.6 nM) to aid our exploration of the molecular mechanisms utilized to maintain peptide specificity. Remarkably, although the enhanced affinity was mediated primarily through new TCR-MHC contacts, α24β17 remained acutely sensitive to modifications at every position along the peptide backbone, mimicking the specificity of the wild type TCR. Thermodynamic analyses revealed an important role for solvation in directing peptide specificity. These findings advance our understanding of the molecular mechanisms that can govern the exquisite peptide specificity characteristic of TCR recognition.
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Affiliation(s)
- Florian Madura
- Cardiff University School of Medicine, Heath Park, Cardiff CF14 4XN, United Kingdom
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25
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Knight RR, Kronenberg D, Zhao M, Huang GC, Eichmann M, Bulek A, Wooldridge L, Cole DK, Sewell AK, Peakman M, Skowera A. Human β-cell killing by autoreactive preproinsulin-specific CD8 T cells is predominantly granule-mediated with the potency dependent upon T-cell receptor avidity. Diabetes 2013; 62:205-13. [PMID: 22936177 PMCID: PMC3526019 DOI: 10.2337/db12-0315] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/11/2012] [Accepted: 07/07/2012] [Indexed: 01/16/2023]
Abstract
The end-stage immunopathology of type 1 diabetes resulting in β-cell destruction appears to be strongly dominated by cytotoxic CD8 T lymphocytes (CD8 T cells). However, the mechanism of cytotoxicity used by autoreactive CD8 T cells in the human setting remains unknown. Using type 1 diabetes patient-derived preproinsulin-specific CD8 T-cell clones recognizing either an HLA-A2 (A*0201) or HLA-A24 (A*2402)-restricted epitope (peptide of preproinsulin [PPI](15-24), ALWGPDPAAA; or PPI(3-11), LWMRLLPLL), we assessed the use of conventional mediators of cytotoxicity in the destruction of human β-cells in vitro compared with virus-specific cytotoxic CD8 T-cell clones. We show that PPI-specific CD8 T-cell clones are mainly reliant upon cytotoxic degranulation for inducing β-cell death. Furthermore, we find that in comparison with virus-specific CD8 T cells, there are differences in the killing potency of PPI-specific CD8 T cells that are not due to cell-intrinsic differences, but rather are mediated by differences in strength of signaling by peptide-HLA ligands. The study highlights the regulation of β-cell killing as a potential point for therapeutic control, including the possibility of blocking autoreactive CD8 T-cell function without impacting upon general immune competence.
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Affiliation(s)
- Robin R. Knight
- Department of Immunobiology, King’s College London, London, United Kingdom
| | - Deborah Kronenberg
- Department of Immunobiology, King’s College London, London, United Kingdom
- National Institute for Health Research comprehensive Biomedical Research Centre, Guy’s and St. Thomas’ National Health Service Foundation Trust and King’s College London, London, United Kingdom
| | - Min Zhao
- Diabetes and Nutritional Science, King’s College London, London, United Kingdom
| | - Guo Cai Huang
- Diabetes and Nutritional Science, King’s College London, London, United Kingdom
| | - Martin Eichmann
- Department of Immunobiology, King’s College London, London, United Kingdom
| | - Anna Bulek
- Institute of Infection and Immunity, Cardiff University School of Medicine, Cardiff, United Kingdom
| | - Linda Wooldridge
- Institute of Infection and Immunity, Cardiff University School of Medicine, Cardiff, United Kingdom
| | - David K. Cole
- Institute of Infection and Immunity, Cardiff University School of Medicine, Cardiff, United Kingdom
| | - Andrew K. Sewell
- Institute of Infection and Immunity, Cardiff University School of Medicine, Cardiff, United Kingdom
| | - Mark Peakman
- Department of Immunobiology, King’s College London, London, United Kingdom
- National Institute for Health Research comprehensive Biomedical Research Centre, Guy’s and St. Thomas’ National Health Service Foundation Trust and King’s College London, London, United Kingdom
| | - Ania Skowera
- Department of Immunobiology, King’s College London, London, United Kingdom
- National Institute for Health Research comprehensive Biomedical Research Centre, Guy’s and St. Thomas’ National Health Service Foundation Trust and King’s College London, London, United Kingdom
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26
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Cole DK, Laugel B, Clement M, Price DA, Wooldridge L, Sewell AK. The molecular determinants of CD8 co-receptor function. Immunology 2012; 137:139-48. [PMID: 22804746 DOI: 10.1111/j.1365-2567.2012.03625.x] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
CD8(+) T cells respond to signals mediated through a specific interaction between the T-cell receptor (TCR) and a composite antigen in the form of an epitopic peptide bound between the polymorphic α1 and α2 helices of an MHC class I (MHCI) molecule. The CD8 glycoprotein 'co-receives' antigen by binding to an invariant region of the MHCI molecule and can enhance ligand recognition by up to 1 million-fold. In recent years, a number of structural and biophysical investigations have shed light on the role of the CD8 co-receptor during T-cell antigen recognition. Here, we provide a collated resource for these data, and discuss how the structural and biophysical parameters governing CD8 co-receptor function further our understanding of T-cell cross-reactivity and the productive engagement of low-affinity antigenic ligands.
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Affiliation(s)
- David K Cole
- Institute of Infection and Immunity, Cardiff University School of Medicine, Cardiff, UK.
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27
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Ekeruche-Makinde J, Clement M, Cole DK, Edwards ESJ, Ladell K, Miles JJ, Matthews KK, Fuller A, Lloyd KA, Madura F, Dolton GM, Pentier J, Lissina A, Gostick E, Baxter TK, Baker BM, Rizkallah PJ, Price DA, Wooldridge L, Sewell AK. T-cell receptor-optimized peptide skewing of the T-cell repertoire can enhance antigen targeting. J Biol Chem 2012; 287:37269-81. [PMID: 22952231 PMCID: PMC3481325 DOI: 10.1074/jbc.m112.386409] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
Altered peptide antigens that enhance T-cell immunogenicity have been used to improve peptide-based vaccination for a range of diseases. Although this strategy can prime T-cell responses of greater magnitude, the efficacy of constituent T-cell clonotypes within the primed population can be poor. To overcome this limitation, we isolated a CD8+ T-cell clone (MEL5) with an enhanced ability to recognize the HLA A*0201-Melan A27–35 (HLA A*0201-AAGIGILTV) antigen expressed on the surface of malignant melanoma cells. We used combinatorial peptide library screening to design an optimal peptide sequence that enhanced functional activation of the MEL5 clone, but not other CD8+ T-cell clones that recognized HLA A*0201-AAGIGILTV poorly. Structural analysis revealed the potential for new contacts between the MEL5 T-cell receptor and the optimized peptide. Furthermore, the optimized peptide was able to prime CD8+ T-cell populations in peripheral blood mononuclear cell isolates from multiple HLA A*0201+ individuals that were capable of efficient HLA A*0201+ melanoma cell destruction. This proof-of-concept study demonstrates that it is possible to design altered peptide antigens for the selection of superior T-cell clonotypes with enhanced antigen recognition properties.
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Affiliation(s)
- Julia Ekeruche-Makinde
- Institute of Infection and Immunity, Cardiff University School of Medicine, Henry Wellcome Building, Heath Park, Cardiff CF14 4XN, Wales, United Kingdom
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28
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Holland CJ, Rizkallah PJ, Vollers S, Calvo-Calle JM, Madura F, Fuller A, Sewell AK, Stern LJ, Godkin A, Cole DK. Minimal conformational plasticity enables TCR cross-reactivity to different MHC class II heterodimers. Sci Rep 2012; 2:629. [PMID: 22953050 PMCID: PMC3432979 DOI: 10.1038/srep00629] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2012] [Accepted: 08/17/2012] [Indexed: 01/11/2023] Open
Abstract
Successful immunity requires that a limited pool of αβ T-cell receptors (TCRs) provide cover for a vast number of potential foreign peptide antigens presented by 'self' major histocompatibility complex (pMHC) molecules. Structures of unligated and ligated MHC class-I-restricted TCRs with different ligands, supplemented with biophysical analyses, have revealed a number of important mechanisms that govern TCR mediated antigen recognition. HA1.7 TCR binding to the influenza hemagglutinin antigen (HA(306-318)) presented by HLA-DR1 or HLA-DR4 represents an ideal system for interrogating pMHC-II antigen recognition. Accordingly, we solved the structure of the unligated HA1.7 TCR and compared it to both complex structures. Despite a relatively rigid binding mode, HA1.7 T-cells could tolerate mutations in key contact residues within the peptide epitope. Thermodynamic analysis revealed that limited plasticity and extreme favorable entropy underpinned the ability of the HA1.7 T-cell clone to cross-react with HA(306-318) presented by multiple MHC-II alleles.
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MESH Headings
- Amino Acid Sequence
- Cells, Cultured
- Cross Reactions
- Crystallography, X-Ray
- Epitopes/chemistry
- Epitopes/immunology
- HLA-DR1 Antigen/chemistry
- HLA-DR1 Antigen/immunology
- HLA-DR4 Antigen/chemistry
- HLA-DR4 Antigen/immunology
- Humans
- Hydrogen Bonding
- Hydrophobic and Hydrophilic Interactions
- Lymphocyte Activation
- Models, Molecular
- Protein Binding
- Protein Structure, Quaternary
- Protein Structure, Secondary
- Protein Structure, Tertiary
- Receptors, Antigen, T-Cell, alpha-beta/chemistry
- Receptors, Antigen, T-Cell, alpha-beta/immunology
- T-Lymphocytes/immunology
- T-Lymphocytes/physiology
- Thermodynamics
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Affiliation(s)
- Christopher J. Holland
- Institute of Infection and Immunity, Cardiff University School of Medicine, The Henry Wellcome Building, Cardiff, CF14 4XN, United Kingdom
| | - Pierre J. Rizkallah
- Institute of Infection and Immunity, Cardiff University School of Medicine, The Henry Wellcome Building, Cardiff, CF14 4XN, United Kingdom
| | - Sabrina Vollers
- Department of Pathology, University of Massachusetts Medical School, Worcester, MA 01655
| | - J. Mauricio Calvo-Calle
- Department of Biochemistry & Molecular Pharmacology, University of Massachusetts Medical School, Worcester, MA 01655
| | - Florian Madura
- Institute of Infection and Immunity, Cardiff University School of Medicine, The Henry Wellcome Building, Cardiff, CF14 4XN, United Kingdom
| | - Anna Fuller
- Institute of Infection and Immunity, Cardiff University School of Medicine, The Henry Wellcome Building, Cardiff, CF14 4XN, United Kingdom
| | - Andrew K. Sewell
- Institute of Infection and Immunity, Cardiff University School of Medicine, The Henry Wellcome Building, Cardiff, CF14 4XN, United Kingdom
| | - Lawrence J. Stern
- Department of Pathology, University of Massachusetts Medical School, Worcester, MA 01655
- Department of Biochemistry & Molecular Pharmacology, University of Massachusetts Medical School, Worcester, MA 01655
| | - Andrew Godkin
- Institute of Infection and Immunity, Cardiff University School of Medicine, The Henry Wellcome Building, Cardiff, CF14 4XN, United Kingdom
- Department of Integrated Medicine, University Hospital of Wales, Cardiff, CF14 4XW, United Kingdom
- These authors contributed equally
| | - David K. Cole
- Institute of Infection and Immunity, Cardiff University School of Medicine, The Henry Wellcome Building, Cardiff, CF14 4XN, United Kingdom
- These authors contributed equally
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29
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Bulek AM, Madura F, Fuller A, Holland CJ, Schauenburg AJ, Sewell AK, Rizkallah PJ, Cole DK. TCR/pMHC Optimized Protein crystallization Screen. J Immunol Methods 2012; 382:203-10. [PMID: 22705983 PMCID: PMC3404460 DOI: 10.1016/j.jim.2012.06.007] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2012] [Revised: 06/07/2012] [Accepted: 06/07/2012] [Indexed: 11/24/2022]
Abstract
The interaction between the clonotypic αβ T cell receptor (TCR), expressed on the T cell surface, and peptide-major histocompatibility complex (pMHC) molecules, expressed on the target cell surface, governs T cell mediated autoimmunity and immunity against pathogens and cancer. Structural investigations of this interaction have been limited because of the challenges inherent in the production of good quality TCR/pMHC protein crystals. Here, we report the development of an 'intelligently designed' crystallization screen that reproducibly generates high quality TCR/pMHC complex crystals suitable for X-ray crystallographic studies, thereby reducing protein consumption. Over the last 2 years, we have implemented this screen to produce 32 T cell related protein structures at high resolution, substantially contributing to the current immune protein database. Protein crystallography, used to study this interaction, has already extended our understanding of the molecular rules that govern T cell immunity. Subsequently, these data may help to guide the intelligent design of T cell based therapies that target human diseases, underlining the importance of developing optimized approaches for crystallizing novel TCR/pMHC complexes.
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30
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Cole DK, Gallagher K, Lemercier B, Holland CJ, Junaid S, Hindley JP, Wynn KK, Gostick E, Sewell AK, Gallimore AM, Ladell K, Price DA, Gougeon ML, Godkin A. Modification of the carboxy-terminal flanking region of a universal influenza epitope alters CD4⁺ T-cell repertoire selection. Nat Commun 2012; 3:665. [PMID: 22314361 PMCID: PMC3293629 DOI: 10.1038/ncomms1665] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2011] [Accepted: 01/05/2012] [Indexed: 02/01/2023] Open
Abstract
Human CD4(+) αβ T cells are activated via T-cell receptor recognition of peptide epitopes presented by major histocompatibility complex (MHC) class II (MHC-II). The open ends of the MHC-II binding groove allow peptide epitopes to extend beyond a central nonamer core region at both the amino- and carboxy-terminus. We have previously found that these non-bound C-terminal residues can alter T cell activation in an MHC allele-transcending fashion, although the mechanism for this effect remained unclear. Here we show that modification of the C-terminal peptide-flanking region of an influenza hemagglutinin (HA(305-320)) epitope can alter T-cell receptor binding affinity, T-cell activation and repertoire selection of influenza-specific CD4(+) T cells expanded from peripheral blood. These data provide the first demonstration that changes in the C-terminus of the peptide-flanking region can substantially alter T-cell receptor binding affinity, and indicate a mechanism through which peptide flanking residues could influence repertoire selection.
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Affiliation(s)
- David K. Cole
- Institute of Infection and Immunity, Cardiff University School of Medicine, The Henry Wellcome Building, Cardiff CF14 4XN, Wales, UK
- These authors contributed equally to this work
| | - Kathleen Gallagher
- Institute of Infection and Immunity, Cardiff University School of Medicine, The Henry Wellcome Building, Cardiff CF14 4XN, Wales, UK
- These authors contributed equally to this work
| | - Brigitte Lemercier
- Institut Pasteur, Antiviral Immunity, Biotherapy and Vaccine Unit, Department of Infection and Epidemiology, rue du Dr. Roux, 75015 Paris, France
- These authors contributed equally to this work
| | - Christopher J. Holland
- Institute of Infection and Immunity, Cardiff University School of Medicine, The Henry Wellcome Building, Cardiff CF14 4XN, Wales, UK
| | - Sayed Junaid
- Institute of Infection and Immunity, Cardiff University School of Medicine, The Henry Wellcome Building, Cardiff CF14 4XN, Wales, UK
| | - James P. Hindley
- Institute of Infection and Immunity, Cardiff University School of Medicine, The Henry Wellcome Building, Cardiff CF14 4XN, Wales, UK
| | - Katherine K. Wynn
- Institute of Infection and Immunity, Cardiff University School of Medicine, The Henry Wellcome Building, Cardiff CF14 4XN, Wales, UK
| | - Emma Gostick
- Institute of Infection and Immunity, Cardiff University School of Medicine, The Henry Wellcome Building, Cardiff CF14 4XN, Wales, UK
| | - Andrew K. Sewell
- Institute of Infection and Immunity, Cardiff University School of Medicine, The Henry Wellcome Building, Cardiff CF14 4XN, Wales, UK
| | - Awen M. Gallimore
- Institute of Infection and Immunity, Cardiff University School of Medicine, The Henry Wellcome Building, Cardiff CF14 4XN, Wales, UK
| | - Kristin Ladell
- Institute of Infection and Immunity, Cardiff University School of Medicine, The Henry Wellcome Building, Cardiff CF14 4XN, Wales, UK
| | - David A. Price
- Institute of Infection and Immunity, Cardiff University School of Medicine, The Henry Wellcome Building, Cardiff CF14 4XN, Wales, UK
| | - Marie-Lise Gougeon
- Institut Pasteur, Antiviral Immunity, Biotherapy and Vaccine Unit, Department of Infection and Epidemiology, rue du Dr. Roux, 75015 Paris, France
| | - Andrew Godkin
- Institute of Infection and Immunity, Cardiff University School of Medicine, The Henry Wellcome Building, Cardiff CF14 4XN, Wales, UK
- Department of Medicine, University Hospital of Wales, Cardiff CF14 4XW, Wales, UK
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31
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Bulek AM, Cole DK, Skowera A, Dolton G, Gras S, Madura F, Fuller A, Miles JJ, Gostick E, Price DA, Drijfhout JW, Knight RR, Huang GC, Lissin N, Molloy PE, Wooldridge L, Jakobsen BK, Rossjohn J, Peakman M, Rizkallah PJ, Sewell AK. Structural basis for the killing of human beta cells by CD8(+) T cells in type 1 diabetes. Nat Immunol 2012; 13:283-9. [PMID: 22245737 PMCID: PMC3378510 DOI: 10.1038/ni.2206] [Citation(s) in RCA: 128] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2011] [Accepted: 12/06/2011] [Indexed: 12/11/2022]
Abstract
The structural characteristics of the engagement of major histocompatibility complex (MHC) class II-restricted self antigens by autoreactive T cell antigen receptors (TCRs) is established, but how autoimmune TCRs interact with complexes of self peptide and MHC class I has been unclear. Here we examined how CD8(+) T cells kill human islet beta cells in type 1 diabetes via recognition of a human leukocyte antigen HLA-A*0201-restricted glucose-sensitive preproinsulin peptide by the autoreactive TCR 1E6. Rigid 'lock-and-key' binding underpinned the 1E6-HLA-A*0201-peptide interaction, whereby 1E6 docked similarly to most MHC class I-restricted TCRs. However, this interaction was extraordinarily weak because of limited contacts with MHC class I. TCR binding was highly peptide centric, dominated by two residues of the complementarity-determining region 3 (CDR3) loops that acted as an 'aromatic-cap' over the complex of peptide and MHC class I (pMHCI). Thus, highly focused peptide-centric interactions associated with suboptimal TCR-pMHCI binding affinities might lead to thymic escape and potential CD8(+) T cell-mediated autoreactivity.
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Affiliation(s)
- Anna M Bulek
- Institute of Infection and Immunity, Cardiff University School of Medicine, Heath Park, Cardiff, UK
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32
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Wong RL, Liu B, Zhu X, You L, Kong L, Han KP, Lee HI, Chavaillaz PA, Jin M, Wang Y, Rhode PR, Wong HC. Interleukin-15:Interleukin-15 receptor α scaffold for creation of multivalent targeted immune molecules. Protein Eng Des Sel 2011; 24:373-83. [PMID: 21177283 PMCID: PMC3049345 DOI: 10.1093/protein/gzq116] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2010] [Revised: 10/27/2010] [Accepted: 11/23/2010] [Indexed: 12/22/2022] Open
Abstract
Human interleukin-15 (hIL-15) and its receptor α (hIL-15Rα) are co-expressed in antigen presenting cells allowing trans-presentation of the cytokine to immune effector cells. We exploited the high-affinity interactions between hIL-15 and the extracellular hIL-15Rα sushi domain (hIL-15RαSu) to create a functional scaffold for the design of multispecific fusion protein complexes. Using single-chain T cell receptors (scTCRs) as recognition domains linked to the IL-15:IL-15Rα scaffold, we generated both bivalent and bispecific complexes. In these fusions, the scTCR domains retain the antigen-binding activity and the hIL-15 domain exhibits receptor binding and biological activity. As expected, bivalent scTCR fusions exhibited improved antigen binding due to increased avidity, whereas fusions comprising two different scTCR domains were capable of binding two cognate peptide/MHC complexes. Bispecific molecules containing scTCR and scCD8αβ domains also exhibit enhanced binding to peptide/MHC complexes, demonstrating that the IL-15:IL-15Rα scaffold displays flexibility necessary to support multi-domain interactions with a given target. Surprisingly, functional heterodimeric molecules could be formed by co-expressing the TCR α and β chains separately as fusions to the hIL-15 and hIL-15RαSu domains. Together, these properties indicate that the hIL-15 and hIL-15RαSu domains can be used as versatile, functional scaffold for generating novel targeted immune molecules.
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Affiliation(s)
- Richard L. Wong
- Department of Biomedical Engineering, Cornell University, Ithaca, NY 14850, USA
| | - Bai Liu
- Altor BioScience Corporation, Miramar, FL 33025, USA
| | - Xiaoyun Zhu
- Altor BioScience Corporation, Miramar, FL 33025, USA
| | - Lijing You
- Altor BioScience Corporation, Miramar, FL 33025, USA
| | - Lin Kong
- Altor BioScience Corporation, Miramar, FL 33025, USA
| | - Kai-Ping Han
- Altor BioScience Corporation, Miramar, FL 33025, USA
| | - Hyung-il Lee
- Altor BioScience Corporation, Miramar, FL 33025, USA
| | | | - Moonsoo Jin
- Department of Biomedical Engineering, Cornell University, Ithaca, NY 14850, USA
| | - Yi Wang
- Department of Biomedical Engineering, Cornell University, Ithaca, NY 14850, USA
| | | | - Hing C. Wong
- Altor BioScience Corporation, Miramar, FL 33025, USA
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33
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Miles KM, Miles JJ, Madura F, Sewell AK, Cole DK. Real time detection of peptide-MHC dissociation reveals that improvement of primary MHC-binding residues can have a minimal, or no, effect on stability. Mol Immunol 2010; 48:728-32. [PMID: 21130497 PMCID: PMC3032881 DOI: 10.1016/j.molimm.2010.11.004] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2010] [Revised: 11/01/2010] [Accepted: 11/01/2010] [Indexed: 12/02/2022]
Abstract
The majority of known major histocompatibility complex class I (MHCI)-associated tumor-derived peptide antigens do not contain an optimal motif for MHCI binding. As a result, anchor residue-modified ‘heteroclitic’ peptides have been widely used in therapeutic cancer vaccination trials in order to enhance immune responsiveness. In general, the improved stability of these heteroclitic complexes has been inferred from their improved immunogenicity but has not been formally assessed. Here, we investigated the binding of 4 HLA A*0201-restricted tumor-derived peptides and their commonly used heteroclitic variants. We utilized a cell surface binding assay and a novel robust method for testing the durability of soluble recombinant pMHCI in real time by surface plasmon resonance. Surprisingly, we show that heteroclitic peptides designed with optimal MHC binding motifs do not always form pMHCs that are substantially more stable than their wildtype progenitors. These findings, combined with our recent discovery that TCRs can distinguish between wildtype peptides and those altered at a primary buried MHC anchor residue, suggest that altered TCR binding may account for a large part of the increased immune response that can be generated by anchor residue-modified ligands. Our results further highlight the fact that heteroclitic peptide-based immune interventions require careful evaluation to ensure that wildtype antigen specificity is maintained in vivo.
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Affiliation(s)
- Kim M. Miles
- Cardiff University, School of Medicine, Heath Park, Cardiff, UK
| | - John J. Miles
- Cardiff University, School of Medicine, Heath Park, Cardiff, UK
- Cellular Immunology Laboratory, Queensland Institute of Medical Research, Brisbane, Australia
| | - Florian Madura
- Cardiff University, School of Medicine, Heath Park, Cardiff, UK
| | | | - David K. Cole
- Cardiff University, School of Medicine, Heath Park, Cardiff, UK
- Corresponding author at: Cardiff University, School of Medicine, Henry Wellcome Building, Heath Park, Cardiff CF14 4XN, UK. Tel.: +442920687006; fax: +4402920687007.
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34
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Rich RL, Myszka DG. Grading the commercial optical biosensor literature-Class of 2008: 'The Mighty Binders'. J Mol Recognit 2010; 23:1-64. [PMID: 20017116 DOI: 10.1002/jmr.1004] [Citation(s) in RCA: 109] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Optical biosensor technology continues to be the method of choice for label-free, real-time interaction analysis. But when it comes to improving the quality of the biosensor literature, education should be fundamental. Of the 1413 articles published in 2008, less than 30% would pass the requirements for high-school chemistry. To teach by example, we spotlight 10 papers that illustrate how to implement the technology properly. Then we grade every paper published in 2008 on a scale from A to F and outline what features make a biosensor article fabulous, middling or abysmal. To help improve the quality of published data, we focus on a few experimental, analysis and presentation mistakes that are alarmingly common. With the literature as a guide, we want to ensure that no user is left behind.
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Affiliation(s)
- Rebecca L Rich
- Center for Biomolecular Interaction Analysis, University of Utah, Salt Lake City, UT 84132, USA
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35
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Chen JL, Morgan AJ, Stewart-Jones G, Shepherd D, Bossi G, Wooldridge L, Hutchinson SL, Sewell AK, Griffiths GM, van der Merwe PA, Jones EY, Galione A, Cerundolo V. Ca2+ release from the endoplasmic reticulum of NY-ESO-1-specific T cells is modulated by the affinity of TCR and by the use of the CD8 coreceptor. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2010; 184:1829-1839. [PMID: 20053942 PMCID: PMC4222200 DOI: 10.4049/jimmunol.0902103] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Although several cancer immunotherapy strategies are based on the use of analog peptides and on the modulation of the TCR affinity of adoptively transferred T cells, it remains unclear whether tumor-specific T cell activation by strong and weak TCR stimuli evoke different Ca(2+) signatures from the Ca(2+) intracellular stores and whether the amplitude of Ca(2+) release from the endoplasmic reticulum (ER) can be further modulated by coreceptor binding to peptide/MHC. In this study, we combined functional, structural, and kinetic measurements to correlate the intensity of Ca(2+) signals triggered by the stimulation of the 1G4 T cell clone specific to the tumor epitope NY-ESO-1(157-165). Two analogs of the NY-ESO-1(157-165) peptide, having similar affinity to HLA-A2 molecules, but a 6-fold difference in binding affinity for the 1G4 TCR, resulted in different Ca(2+) signals and T cell activation. 1G4 stimulation by the stronger stimulus emptied the ER of stored Ca(2+), even in the absence of CD8 binding, resulting in sustained Ca(2+) influx. In contrast, the weaker stimulus induced only partial emptying of stored Ca(2+), resulting in significantly diminished and oscillatory Ca(2+) signals, which were enhanced by CD8 binding. Our data define the range of TCR/peptide MHC affinities required to induce depletion of Ca(2+) from intracellular stores and provide insights into the ability of T cells to tailor the use of the CD8 coreceptor to enhance Ca(2+) release from the ER. This, in turn, modulates Ca(2+) influx from the extracellular environment, ultimately controlling T cell activation.
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Affiliation(s)
- Ji-Li Chen
- Weatherall Institute of Molecular Medicine, OX3 9DS, Oxford
| | - Anthony J. Morgan
- Dept of Pharmacology, University of Oxford, Mansfield Road, Oxford, OX1 3QT, UK
| | - Guillaume Stewart-Jones
- Division of Structural Biology, Wellcome Trust Centre for Human Genetics, University of Oxford, Roosevelt Drive, Oxford OX3 7BN, UK
| | - Dawn Shepherd
- Weatherall Institute of Molecular Medicine, OX3 9DS, Oxford
| | - Giovanna Bossi
- Immunocore, Limited, 57c Milton Park, Abingdon, Oxon, OX14 4RX, UK
| | - Linda Wooldridge
- Dept of Infection, Immunity and Biochemistry, The Henry Wellcome Building, Cardiff University School of Medicine, Cardiff, CF14 4XN
| | | | - Andrew K. Sewell
- Dept of Infection, Immunity and Biochemistry, The Henry Wellcome Building, Cardiff University School of Medicine, Cardiff, CF14 4XN
| | - Gillian M. Griffiths
- Cambridge Institute for Medical Research, PO Box 139, Addenbrooke’s Hospital, Hills Road, Cambridge CB2 0XY, UK
| | | | - E. Yvonne Jones
- Division of Structural Biology, Wellcome Trust Centre for Human Genetics, University of Oxford, Roosevelt Drive, Oxford OX3 7BN, UK
| | - Antony Galione
- Dept of Pharmacology, University of Oxford, Mansfield Road, Oxford, OX1 3QT, UK
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36
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Cole DK, Yuan F, Rizkallah PJ, Miles JJ, Gostick E, Price DA, Gao GF, Jakobsen BK, Sewell AK. Germ line-governed recognition of a cancer epitope by an immunodominant human T-cell receptor. J Biol Chem 2009; 284:27281-9. [PMID: 19605354 PMCID: PMC2785656 DOI: 10.1074/jbc.m109.022509] [Citation(s) in RCA: 125] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2009] [Revised: 05/18/2009] [Indexed: 11/06/2022] Open
Abstract
CD8(+) T-cells specific for MART-1-(26-35), a dominant melanoma epitope restricted by human leukocyte antigen (HLA)-A*0201, are exceptionally common in the naive T-cell repertoire. Remarkably, the TRAV12-2 gene is used to encode the T-cell receptor alpha (TCRalpha) chain in >87% of these T-cells. Here, the molecular basis for this genetic bias is revealed from the structural and thermodynamic properties of an archetypal TRAV12-2-encoded TCR complexed to the clinically relevant heteroclitic peptide, ELAGIGILTV, bound to HLA-A*0201 (A2-ELA). Unusually, the TRAV12-2 germ line-encoded regions of the TCR dominate the major atomic contacts with the peptide at the TCR/A2-ELA interface. This "innate" pattern of antigen recognition probably explains the unique characteristics and extraordinary frequencies of CD8(+) T-cell responses to this epitope.
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Affiliation(s)
- David K. Cole
- From the Department of Infection, Immunity, and Biochemistry, Henry Wellcome Building, Cardiff University School of Medicine, Heath Park, Cardiff CF14 4XN, United Kingdom
| | - Fang Yuan
- the Nuffield Department of Clinical Medicine, John Radcliffe Hospital, Oxford University, Oxford OX3 9DU, United Kingdom
| | - Pierre J. Rizkallah
- From the Department of Infection, Immunity, and Biochemistry, Henry Wellcome Building, Cardiff University School of Medicine, Heath Park, Cardiff CF14 4XN, United Kingdom
- the STFC Daresbury Laboratory, Warrington, Cheshire WA4 4AD, United Kingdom
| | - John J. Miles
- From the Department of Infection, Immunity, and Biochemistry, Henry Wellcome Building, Cardiff University School of Medicine, Heath Park, Cardiff CF14 4XN, United Kingdom
- the Cellular Immunology Laboratory, Queensland Institute of Medical Research, University of Queensland, Brisbane 4029, Australia
| | - Emma Gostick
- From the Department of Infection, Immunity, and Biochemistry, Henry Wellcome Building, Cardiff University School of Medicine, Heath Park, Cardiff CF14 4XN, United Kingdom
| | - David A. Price
- From the Department of Infection, Immunity, and Biochemistry, Henry Wellcome Building, Cardiff University School of Medicine, Heath Park, Cardiff CF14 4XN, United Kingdom
| | - George F. Gao
- the **Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China, and
| | - Bent K. Jakobsen
- Immunocore Limited, 57C Milton Park, Abingdon, Oxon OX14 4RX, United Kingdom
| | - Andrew K. Sewell
- From the Department of Infection, Immunity, and Biochemistry, Henry Wellcome Building, Cardiff University School of Medicine, Heath Park, Cardiff CF14 4XN, United Kingdom
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37
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Wooldridge L, Lissina A, Cole DK, van den Berg HA, Price DA, Sewell AK. Tricks with tetramers: how to get the most from multimeric peptide-MHC. Immunology 2009; 126:147-64. [PMID: 19125886 PMCID: PMC2632693 DOI: 10.1111/j.1365-2567.2008.02848.x] [Citation(s) in RCA: 131] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2008] [Revised: 03/18/2008] [Accepted: 03/18/2008] [Indexed: 01/16/2023] Open
Abstract
The development of fluorochrome-conjugated peptide-major histocompatibility complex (pMHC) multimers in conjunction with continuing advances in flow cytometry has transformed the study of antigen-specific T cells by enabling their visualization, enumeration, phenotypic characterization and isolation from ex vivo samples. Here, we bring together and discuss some of the 'tricks' that can be used to get the most out of pMHC multimers. These include: (1) simple procedures that can substantially enhance the staining intensity of cognate T cells with pMHC multimers; (2) the use of pMHC multimers to stain T cells with very-low-affinity T-cell receptor (TCR)/pMHC interactions, such as those that typically predominate in tumour-specific responses; and (3) the physical grading and clonotypic dissection of antigen-specific T cells based on the affinity of their cognate TCR using mutant pMHC multimers in conjunction with new approaches to the molecular analysis of TCR gene expression. We also examine how soluble pMHC can be used to examine T-cell activation, manipulate T-cell responses and study allogeneic and superantigen interactions with TCRs. Finally, we discuss the problems that arise with pMHC class II (pMHCII) multimers because of the low affinity of TCR/pMHCII interactions and lack of 'coreceptor help'.
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Affiliation(s)
- Linda Wooldridge
- Department of Medical Biochemistry and Immunology, Cardiff University School of Medicine, Henry Wellcome Building, Heath Park, Cardiff, UK
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Chattopadhyay PK, Melenhorst JJ, Ladell K, Gostick E, Scheinberg P, Barrett AJ, Wooldridge L, Roederer M, Sewell AK, Price DA. Techniques to improve the direct ex vivo detection of low frequency antigen-specific CD8+ T cells with peptide-major histocompatibility complex class I tetramers. Cytometry A 2008; 73:1001-9. [PMID: 18836993 DOI: 10.1002/cyto.a.20642] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
The ability to quantify and characterize antigen-specific CD8+ T cells irrespective of functional readouts using fluorochrome-conjugated peptide-major histocompatibility complex class I (pMHCI) tetramers in conjunction with flow cytometry has transformed our understanding of cellular immune responses over the past decade. In the case of prevalent CD8+ T cell populations that engage cognate pMHCI tetramers with high avidities, direct ex vivo identification and subsequent data interpretation is relatively straightforward. However, the accurate identification of low frequency antigen-specific CD8+ T cell populations can be complicated, especially in situations where T cell receptor-mediated tetramer binding occurs at low avidities. Here, we highlight a few simple techniques that can be employed to improve the visual resolution, and hence the accurate quantification, of tetramer binding CD8+ T cell populations by flow cytometry. These methodological modifications enhance signal intensity, especially in the case of specific CD8+ T cell populations that bind cognate antigen with low avidities, minimize background noise, and enable improved discrimination of true pMHCI tetramer binding events from nonspecific uptake.
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Affiliation(s)
- Pratip K Chattopadhyay
- Immunotechnology Section, Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland 20892, USA
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