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Publication Abstract from PubMed

Phosphopeptides presented by major histocompatibility complex (MHC) class I have been regarded as a pivotal type of cancer neoantigens that are recognized by T cells. The structural basis of single-phosphorylated peptide presentation has been well studied. Diphosphorylation with one interval between two sites is one of the prevalent forms of multisite-phosphorylated peptides. Herein, we determined the molecular basis of presentation of two P4/P6 double pS-containing peptides by HLA-B27 and compared them with unmodified and single-phosphorylated peptide complexes. These data clarified not only the HLA allele-specific presentation of phosphopeptides by MHC class I molecules but also the cooperativity of peptide conformation within P4 and P6 phosphorylation sites. The phosphorylation of P6 site can influence the binding mode of P4 phosphorylated site to HLA-B27. And we found the diphospho-dependent attenuated effect of peptide binding affinity. This study provides insights into the MHC presentation features of diphosphopeptides, which is different from monophosphopeptides.

Phosphosite-dependent presentation of dual phosphorylated peptides by MHC class I molecules.,Zhao Y, Sun M, Zhang N, Liu X, Yue C, Feng L, Ji S, Liu X, Qi J, Wong CCL, Gao GF, Liu WJ iScience. 2022 Mar 1;25(4):104013. doi: 10.1016/j.isci.2022.104013. eCollection, 2022 Apr 15. PMID:35310951^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.