Peptide-Dependent Recognition of HLA-B*57:01 by KIR3DS1

Journal of Virology
Geraldine M O'ConnorDaniel W McVicar

Abstract

Killer cell immunoglobulin-like receptors (KIRs) play an important role in the activation of natural killer (NK) cells, which in turn contribute to the effective immune control of many viral infections. In the context of HIV infection, the closely related KIR3DL1 and KIR3DS1 molecules, in particular, have been associated with disease outcome. Inhibitory signals via KIR3DL1 are disrupted by downregulation of HLA class I ligands on the infected cell surface and can also be impacted by changes in the presented peptide repertoire. In contrast, the activatory ligands for KIR3DS1 remain obscure. We used a structure-driven approach to define the characteristics of HLA class I-restricted peptides that interact with KIR3DL1 and KIR3DS1. In the case of HLA-B*57:01, we used this knowledge to identify bona fide HIV-derived peptide epitopes with similar properties. Two such peptides facilitated productive interactions between HLA-B*57:01 and KIR3DS1. These data reveal the presence of KIR3DS1 ligands within the HIV-specific peptide repertoire presented by a protective HLA class I allotype, thereby enhancing our mechanistic understanding of the processes that enable NK cells to impact disease outcome. Natural killer (NK) cells are implicated ...Continue Reading

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Methods Mentioned

BETA
transfection
size exclusion chromatography

Software Mentioned

MOSFLM
GraphPad Prism
PHENIX
Phaser
COOT
REFMAC
SCALA
MolProbity
CCP4
GraphPad

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