Analysis of an ascidian integrin provides new insight into early evolution of collagen recognition
2007
αI domain integrins have been found in the ascidian Ciona intestinalis. We produced Ciona α1I domain as a recombinant protein. It did not recognize fibril-forming collagens or bind to GFOGER or other similar motifs in triple-helical peptides. No GFOGER motifs were found in Ciona collagens. As Ciona α1I bound to collagen IX, we propose that before the emergence of GFOGER-dependent collagen receptors in vertebrates, αI domain integrins might have been able to bind to collagen with alternative mechanisms.
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