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The alpha 2 beta 1 integrin functions as a cell surface receptor for collagen on some cells and as both a collagen and laminin receptor on a more restricted subset of cell types including endothelial and epithelial cells. The alpha 2 integrin subunit I domain binds collagen in a divalent cation-dependent manner. In contrast, I domain binding to laminin occurs via both divalent cation-dependent and -independent mechanisms. Saturable binding was observed in the presence of either Mn2+ or EDTA, although the extent of binding in Mn2+ was twice that observed in EDTA. Half-maximal binding occurred at about 22 nM I domain in either case. Whereas laminin binding was significantly enhanced by Mn2+, with half-maximal binding occurring at 1.9 mM Mn2+, Mg2+ was much less effective. Deletion of the N-terminal 35 residues of the I domain, including the DXSXS portion of the MIDAS motif, caused a significant diminution of laminin binding activity. Laminin binding by the I domain was significantly inhibited by the alpha 2 beta 1 function-blocking antibody 6F1 in the presence of either EDTA or Mn2+. The non-function-blocking antibody 12F1 had no effect. In contrast to the binding of the alpha 2 integrin I domain to collagen, the laminin binding activity of the I domain was not enhanced by the addition of the first EF hand motif of the integrin.

cell adhesion and communications/cell adhesion and communication/cell adhesion and communication

Binding of the α<sub>2</sub>Integrin I Domain to Extracellular Matrix Ligands: Structural and Mechanistic Differences between Collagen and Laminin Binding

Binding of the α2Integrin I Domain to Extracellular Matrix Ligands: Structural and Mechanistic Differences between Collagen and Laminin Binding

Binding of the α₂Integrin I Domain to Extracellular Matrix Ligands: Structural and Mechanistic Differences between Collagen and Laminin Binding