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Specificity of bispecific T cell receptors and antibodies targeting peptide-HLA

Holland, Christopher J., Crean, Rory M., Pentier, Johanne M., de Wet, Ben, Lloyd, Angharad, Srikannathasan, Velupillai, Lissin, Nikolai, Lloyd, Katy A., Blicher, Thomas H., Conroy, Paul J., Hock, Miriam, Pengelly, Robert J., Spinner, Thomas E., Cameron, Brian, Potter, Elizabeth A., Jeyanthan, Anitha, Molloy, Peter E., Sami, Malkit, Aleksic, Milos, Liddy, Nathaniel, Robinson, Ross A., Harper, Stephen, Lepore, Marco, Pudney, Chris R., van der Kamp, Marc W., Rizkallah, Pierre J., Jakobsen, Bent K., Vuidepot, Annelise and Cole, David K. 2020. Specificity of bispecific T cell receptors and antibodies targeting peptide-HLA. Journal of Clinical Investigation 130 (5) , 2673–2688. 10.1172/JCI130562

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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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Medicine
Publisher: American Society for Clinical Investigation
ISSN: 0021-9738
Date of First Compliant Deposit: 30 April 2020
Date of Acceptance: 11 February 2020
Last Modified: 04 May 2020 09:15
URI: http://orca-mwe.cf.ac.uk/id/eprint/131327

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