Linked Life Data

9353346

Source:http://linkedlifedata.com/resource/pubmed/id/9353346

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pubmed-article:9353346pubmed:abstractTextLeukocytes and platelets require stimulation for optimal beta3 integrin receptor function, whereas beta3 function is constitutive in many other cells. The molecular mechanisms that enhance integrin function in stimulated hematopoietic cells are poorly understood. Phosphorylation of the beta3 cytoplasmic tail is a recently described but prevalent phenomenon, with unknown effects on alphavbeta3 function. Here, we show that mutation of the beta3 cytoplasmic tail tyrosine 747 to phenylalanine (Y747F) prevents beta3 tyrosine phosphorylation in two cell lines. Whereas this mutation has no effect on alphavbeta3-mediated adhesion in a cell with constitutive beta3 function, it completely abolishes adhesion and clot retraction by a cell that requires stimulation for beta3 function. Ligand-induced conformational change as detected by LIBS-1 antibody occurs normally in Y747F mutant alphavbeta3. Thus, tyrosine 747 of beta3 is required for stimulation of alphavbeta3-mediated adhesion, probably due to its phosphorylation. Because the motif in beta3 required for tyrosine phosphorylation is shared by several integrin beta-chains, this may be a conserved mechanism for regulation of integrin-dependent adhesion.lld:pubmed
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pubmed-article:9353346pubmed:dateRevised2006-11-15lld:pubmed
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pubmed-article:9353346pubmed:articleTitleRequirement of integrin beta3 tyrosine 747 for beta3 tyrosine phosphorylation and regulation of alphavbeta3 avidity.lld:pubmed
pubmed-article:9353346pubmed:affiliationDepartment of Medicine, Infectious Diseases Division, Washington University School of Medicine, St. Louis, Missouri 63110, USA. blystone@id.wustl.edulld:pubmed
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pubmed-article:9353346pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
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