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Deprecated: Implicit conversion from float 243.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Cell+Rep 2015 ; 10 (10): 1655-64 Nephropedia Template TP
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A lupus-associated Mac-1 variant has defects in integrin allostery and interaction with ligands under force #MMPMID25772353
Rosetti F; Chen Y; Sen M; Thayer E; Azcutia V; Herter J; Luscinskas F; Cullere X; Zhu C; Mayadas T
Cell Rep 2015[Mar]; 10 (10): 1655-64 PMID25772353show ga
Leukocyte CD18 integrins increase affinity for ligand via transmission of allosteric signals to and from their ligand binding ?I-domain. Mechanical forces induce allosteric changes that paradoxically slow dissociation by increasing integrin/ligand bond lifetimes, referred to as catch bonds. Like LFA-1, Mac-1 (ITGAM) forms catch bonds with its ligands. However, the Mac-1 rs1143679 (R77H) variant, located in the ?-propeller domain and significantly associated with systemic lupus erythematosus risk, exhibits a marked impairment in 2D ligand affinity and affinity maturation under mechanical force. Targeted mutations and activating antibodies reveal that the failure in Mac-1 R77H allostery is rescued by induction of cytoplasmic tail separation and full integrin extension. These findings demonstrate roles for R77, and the ?-propeller in which it resides, in force-induced allostery relay and integrin bond stabilization, suggesting that these defects may have pathological consequences as the Mac-1 R77H variant associates with increased lupus susceptibility.