title: Specific interaction of the recombinant disintegrin-like domain of MDC-15 (metargidin, ADAM-15) with integrin alphavbeta3.
abstract: MDC-15 (ADAM-15, metargidin), a membrane-anchored metalloprotease/disintegrin/cysteine-rich protein, is expressed on the surface of a wide range of cells and has an RGD tripeptide in its disintegrin-like domain. MDC-15 is potentially involved in cell-cell interactions through its interaction with integrins. We expressed a recombinant MDC-15 disintegrin-like domain as a fusion protein with glutathione S-transferase (designated D-15) in bacteria and examined its binding function to integrins using mammalian cells expressing different recombinant integrins. We found that D-15 specifically interacts with alphavbeta3 but not with the other integrins tested (alpha2beta1, alpha3beta1, alpha4beta1, alpha5beta1, alpha6beta1, alpha6beta4, alphavbeta1, alphaIIbbeta3, and alphaLbeta2). Mutation of the tripeptide RGD to SGA totally blocked binding of D-15 to alphavbeta3, suggesting that D-15-alphavbeta3 interaction is RGD-dependent. When the sequence RPTRGD is mutated to NWKRGD, D-15 is recognized by both alphaIIbbeta3 and alphavbeta3, suggesting that the receptor binding specificity is mediated by the sequence flanking the RGD tripeptide, as in snake venom disintegrins. These results indicate that the disintegrin-like domain of MDC-15 functions as an adhesion molecule and may be involved n alphavbeta3-mediated cell-cell interactions.
authors.affiliation: Department of Vascular Biology, The Scripps Research Institute, La Jolla, California 92037, USA.
authors.forename: X P
authors.initials: XP
authors.lastname: Zhang
authors.forename: T
authors.initials: T
authors.lastname: Kamata
authors.forename: K
authors.initials: K
authors.lastname: Yokoyama
authors.forename: W
authors.initials: W
authors.lastname: Puzon-McLaughlin
authors.forename: Y
authors.initials: Y
authors.lastname: Takada
mesh_terms: D051722:ADAM Proteins; D000818:Animals; D001665:Binding Sites; D016466:CHO Cells; D002448:Cell Adhesion; D002460:Cell Line; D002846:Chromatography, Affinity; D006224:Cricetinae; D019483:Disintegrins / Q000378:metabolism*; D006801:Humans; D008565:Membrane Proteins / Q000378:metabolism*; D008666:Metalloendopeptidases / Q000378:metabolism*; D009842:Oligopeptides / Q000378:metabolism; D019039:Platelet Glycoprotein GPIIb-IIIa Complex / Q000378:metabolism; D011485:Protein Binding; D019030:Receptors, Vitronectin / Q000378:metabolism*; D011994:Recombinant Proteins / Q000378:metabolism; D012995:Solubility; D014407:Tumor Cells, Cultured
chemical_list: D019483:Disintegrins; D008565:Membrane Proteins; D009842:Oligopeptides; D019039:Platelet Glycoprotein GPIIb-IIIa Complex; D019030:Receptors, Vitronectin; D011994:Recombinant Proteins; C047981:arginyl-glycyl-aspartic acid; D051722:ADAM Proteins; C098660:ADAM15 protein, human; D008666:Metalloendopeptidases