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The interaction of collagen IV with cells is mediated mainly by the integrin α1β1. The recognition site has been located to a segment of the triple-helical domain 100 nm away from the N terminus of the collagen molecule. The three essential amino acid residues of the α1β1 binding site, arginine α2(IV)461 and the two aspartate residues α1(IV)461, are all located on different chains. Since the spatial...
The collagen IV molecule is 400 nm long and consists of two α1(IV) and one α2(IV) chains. Their genes COL4A1 and COL4A2 form a transcription unit in which they are arranged head-to-head and connected by a short common promoter region. Recently, four additional genes have been discovered. They are similarly arranged in the pairs COL4A3-A4 and COL4A5-A6 and code for additional collagen IV isoforms....
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