title: Integrin binding characteristics of the disintegrin-like domain of ADAM-15.
abstract: Although discovered as potent inhibitors of a (IIb) ss (3) -mediated platelet aggregation, snake venom disintegrins are now known to bind to other integrins according to different degrees of potency and specificity. More recently, homologues of the disintegrinlike loop have been found as a discrete domain in the ADAM family, yet the potency and specificity of each of these domains in terms of integrin binding is relatively unknown. In this present study, we have selected the disintegrin-like domain (dd) of ADAM-15 (designated as ddADAM-15), the only RGD containing domain in the ADAM family, for a structure/function study. Experimentally, the ddADAM-15 and a number of mutants in which the RGD-containing loop was substituted by cognate regions from ADAM-2, -12 and -19 were tested in terms of integrin-binding activity. For comparison with ADAM-15, an additional mutant (dd (den) ADAM-15) was designed based upon the RGD-containing loop of snake venom dendroaspin, a disintegrin-like integrin antagonist. The results showed that ddADAM-15 is an inhibitor of platelet aggregation, though with less potency than dd (den) ADAM-15. None of the other mutants exhibited significant inhibition of platelet aggregation. ddADAM-15 was found to have higher binding ability for a (2) ss (1) and a (9) ss (1) than the ADAM-2 derived mutant which appeared to be more selective for a (V) ss (3) and a (4) ss (1) than either ddADAM-15 or its ADAM-19 based mutant. The integrin-binding properties of ddADAM-15 were completely abolished by point mutation within the RGD motif (R (64) GD ? A (64) GD). These results suggest a more subtle contribution of this loop sequence to defining the functionality of the ADAMs compared to dendroaspin.
authors.affiliation: Thrombosis Research Institute, Manresa Road, London, SW3 6LR, UK.
authors.forename: Dong
authors.initials: D
authors.lastname: Lu
authors.forename: Kian Fan
authors.initials: KF
authors.lastname: Chung
authors.forename: Min
authors.initials: M
authors.lastname: Xia
authors.forename: Xinjie
authors.initials: X
authors.lastname: Lu
authors.forename: Mike
authors.initials: M
authors.lastname: Scully
authors.forename: Vijay
authors.initials: V
authors.lastname: Kakkar
mesh_terms: D051722:ADAM Proteins / Q000235:genetics* / Q000378:metabolism* / Q000494:pharmacology; D019483:Disintegrins / Q000378:metabolism*; D015195:Drug Design; D004546:Elapid Venoms; D006801:Humans; D016023:Integrins / Q000378:metabolism*; D008565:Membrane Proteins / Q000235:genetics* / Q000378:metabolism* / Q000494:pharmacology; D009842:Oligopeptides; D010974:Platelet Aggregation / Q000187:drug effects; D010975:Platelet Aggregation Inhibitors / Q000737:chemistry* / Q000494:pharmacology; D017354:Point Mutation; D011485:Protein Binding / Q000235:genetics; D015202:Protein Engineering; D017434:Protein Structure, Tertiary; D013329:Structure-Activity Relationship
chemical_list: D019483:Disintegrins; D004546:Elapid Venoms; D016023:Integrins; D008565:Membrane Proteins; D009842:Oligopeptides; D010975:Platelet Aggregation Inhibitors; C074772:mambin; C047981:arginyl-glycyl-aspartic acid; D051722:ADAM Proteins; C098660:ADAM15 protein, human