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Unlabeled collagenous proteins were quantified as inhibitors of binding of native, soluble, radioiodinated type I collagen to the fibroblast surface. Collagen types IV, V a minor cartilage isotype (1 alpha 2 alpha 3 alpha), and the collagenlike tail of acetylcholinesterase did not inhibit binding. Collagen types II and III behaved as competitive inhibitors of type I binding. Denaturation of native collagenous molecules exposed cryptic inhibitory determinants in the separated constituent alpha chains. Inhibition of binding by unlabeled type I collagen was not changed by enzymatic removal of the telopeptides. Inhibitory determinants were detected in cyanogen bromide-derived peptides from various regions of helical alpha 1 (I) and alpha 1(III) chains. The aminoterminal propeptide of chick pro alpha 1(I) was inhibitory for binding, whereas the carboxyterminal three-chain propeptide fragment of human type I procollagen was not. The data are discussed in terms of the proposal that binding to surface receptors initiates the assembly of periodic collagen fibrils in vivo.

the journal of cell biology/the journal of cell biology

Binding of soluble type I collagen to fibroblasts: specificities for native collagen types, triple helical structure, telopeptides, propeptides, and cyanogen bromide-derived peptides.