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Title: Structural basis for self-discrimination by neoantigen-specific TCRs

Journal Article · · Nature Communications
 [1];  [2];  [3];  [3];  [4];  [4]; ORCiD logo [5]; ORCiD logo [3]; ORCiD logo [6]
  1. Icahn School of Medicine at Mount Sinai, New York, NY (United States); Mount Sinai Hospital, New York, NY (United States); Brigham and Women's Hospital (Harvard Medical School), Boston, MA (United States)
  2. Icahn School of Medicine at Mount Sinai, New York, NY (United States); Mount Sinai Hospital, New York, NY (United States)
  3. New York Univ. (NYU) Grossman School of Medicine, NY (United States); NYU Langone Health, New York, NY (United States)
  4. National Institutes of Health (NIH), Bethesda, MD (United States); Barinthus Biotherapeutics, Germantown, MD (United States)
  5. National Institutes of Health (NIH), Bethesda, MD (United States)
  6. Icahn School of Medicine at Mount Sinai, New York, NY (United States); Mount Sinai Hospital, New York, NY (United States); Parker Inst. for Cancer Immunotherapy, Francisco, CA (United States)

T cell receptors (TCR) are pivotal in mediating tumour cell cytolysis via recognition of mutation-derived tumour neoantigens (neoAgs) presented by major histocompatibility class-I (MHC-I). Understanding the factors governing the emergence of neoAg from somatic mutations is a major focus of current research. However, the structural and cellular determinants controlling TCR recognition of neoAgs remain poorly understood. This study describes the multi-level analysis of a model neoAg from the B16F10 murine melanoma, H2-Db/Hsf2 p.K72N68-76, as well as its cognate TCR 47BE7. Through cellular, molecular and structural studies we demonstrate that the p.K72N mutation enhances H2-Db binding, thereby improving cell surface presentation and stabilizing the TCR 47BE7 epitope. Furthermore, TCR 47BE7 exhibited high functional avidity and selectivity, attributable to a broad, stringent, binding interface enabling recognition of native B16F10 despite low antigen density. Our findings provide insight into the generation of anchor-residue modified neoAg, and emphasize the value of molecular and structural investigations of neoAg in diverse MHC-I contexts for advancing the understanding of neoAg immunogenicity.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
2470080
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 15; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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