A Recurrent Mutation in Anaplastic Lymphoma Kinase with Distinct Neoepitope Conformations.

Abstract:

:The identification of recurrent human leukocyte antigen (HLA) neoepitopes driving T cell responses against tumors poses a significant bottleneck in the development of approaches for precision cancer therapeutics. Here, we employ a bioinformatics method, Prediction of T Cell Epitopes for Cancer Therapy, to analyze sequencing data from neuroblastoma patients and identify a recurrent anaplastic lymphoma kinase mutation (ALK R1275Q) that leads to two high affinity neoepitopes when expressed in complex with common HLA alleles. Analysis of the X-ray structures of the two peptides bound to HLA-B*15:01 reveals drastically different conformations with measurable changes in the stability of the protein complexes, while the self-epitope is excluded from binding due to steric hindrance in the MHC groove. To evaluate the range of HLA alleles that could display the ALK neoepitopes, we used structure-based Rosetta comparative modeling calculations, which accurately predict several additional high affinity interactions and compare our results with commonly used prediction tools. Subsequent determination of the X-ray structure of an HLA-A*01:01 bound neoepitope validates atomic features seen in our Rosetta models with respect to key residues relevant for MHC stability and T cell receptor recognition. Finally, MHC tetramer staining of peripheral blood mononuclear cells from HLA-matched donors shows that the two neoepitopes are recognized by CD8+ T cells. This work provides a rational approach toward high-throughput identification and further optimization of putative neoantigen/HLA targets with desired recognition features for cancer immunotherapy.

journal_name

Front Immunol

journal_title

Frontiers in immunology

authors

Toor JS,Rao AA,McShan AC,Yarmarkovich M,Nerli S,Yamaguchi K,Madejska AA,Nguyen S,Tripathi S,Maris JM,Salama SR,Haussler D,Sgourakis NG

doi

10.3389/fimmu.2018.00099

subject

Has Abstract

pub_date

2018-01-30 00:00:00

pages

99

issn

1664-3224

journal_volume

9

pub_type

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