Use of synthetic peptides to locate novel integrin α2β1-binding motifs in human collagen III

被引:149
作者
Raynal, N [1 ]
Hamaia, SW [1 ]
Siljander, PRM [1 ]
Maddox, B [1 ]
Peachey, AR [1 ]
Fernandez, R [1 ]
Foley, LJ [1 ]
Slatter, DA [1 ]
Jarvis, GE [1 ]
Farndale, RW [1 ]
机构
[1] Univ Cambridge, Dept Biochem, Cambridge CB2 1QW, England
基金
英国医学研究理事会;
关键词
D O I
10.1074/jbc.M509818200
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
A set of 57 synthetic peptides encompassing the entire triple-helical domain of human collagen III was used to locate binding sites for the collagen-binding integrin alpha(2)beta(1). The capacity of the peptides to support Mg2+-dependent binding of several integrin preparations was examined. Wild-type integrins (recombinant alpha(2) I-domain, alpha(2)beta(1) purified from platelet membranes, and recombinant soluble alpha(2)beta(1) expressed as an alpha(2)-Fos/beta(1)-Jun heterodimer) bound well to only three peptides, two containing GXX'GER motifs (GROGER and GMOGER, where O is hydroxyproline) and one containing two adjacent GXX'GEN motifs (GLKGEN and GLOGEN). Two mutant alpha(2) I-domains were tested: the inactive T221A mutant, which recognized no peptides, and the constitutively active E318W mutant, which bound a larger subset of peptides. Adhesion of activated human platelets to GER-containing peptides was greater than that of resting platelets, and HT1080 cells bound well to more of the peptides compared with platelets. Binding of cells and recombinant proteins was abolished by anti-alpha(2) monoclonal antibody 6F1 and by chelation of Mg2+. We describe two novel high affinity integrin-binding motifs in human collagen III (GROGER and GLOGEN) and a third motif (GLKGEN) that displays intermediate activity. Each motif was verified using shorter synthetic peptides.
引用
收藏
页码:3821 / 3831
页数:11
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