6arq
From Proteopedia
Crystal structure of CD96 (D1) bound to CD155/necl-5 (D1-3)
Structural highlights
DiseaseTACT_HUMAN C syndrome. The disease is caused by mutations affecting the gene represented in this entry. A chromosomal aberration involving CD96 has been found in a patient with C syndrome. Translocation t(3;18)(q13.13;q12.1). CD96 gene was located at the 3q13.13 breakpoint. Precise structural analysis around the breakpoint showed that the gene was disrupted by the translocation in exon 5, probably leading to premature termination or loss of expression of CD96 protein. No gene was detected at the chromosome 18 breakpoint. FunctionTACT_HUMAN May be involved in adhesive interactions of activated T and NK cells during the late phase of the immune response. Promotes NK cell-target adhesion by interacting with PVR present on target cells. May function at a time after T and NK cells have penetrated the endothelium using integrins and selectins, when they are actively engaging diseased cells and moving within areas of inflammation. Publication Abstract from PubMedCD96, DNAM-1, and TIGIT constitute a group of immunoglobulin superfamily receptors that are key regulators of tumor immune surveillance. Within this axis, CD96 recognizes the adhesion molecule nectin-like protein-5 (necl-5), although the molecular basis underpinning this interaction remains unclear. We show that the first immunoglobulin domain (D1) of CD96 is sufficient to mediate a robust interaction with necl-5, but not the DNAM-1 and TIGIT ligand, nectin-2. The crystal structure of CD96-D1 bound to the necl-5 ectodomain revealed that CD96 recognized necl-5 D1 via a conserved "lock-and-key" interaction observed across TIGIT:necl complexes. Specific necl-5 recognition was underpinned by a novel structural motif within CD96, namely an "ancillary key". Mutational analysis showed that this specific residue was critical for necl-5 binding, while simultaneously providing insights into the unique ligand specificity of CD96. Structural Basis for CD96 Immune Receptor Recognition of Nectin-like Protein-5, CD155.,Deuss FA, Watson GM, Fu Z, Rossjohn J, Berry R Structure. 2018 Nov 8. pii: S0969-2126(18)30384-8. doi:, 10.1016/j.str.2018.10.023. PMID:30528596[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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