Homotrimeric Collagen Peptides As Model Systems For Cell Adhesion Studies
Collagen model peptides with high triple-helix propensity can self-associate into the suprahelical structure, but folding/unfolding of such systems is strongly concentration-dependent. Cross-bridging of the three collagenous chains with synthetic templates as well as with native collagen-type or with artificial cystine knots has been successfully applied to overcome the shortcomings of self-assembled triple helices . Aim of the present study was to analyze the conformational properties of a disulfide-crosslinked trimeric collagen model peptide (2 in Figure 1) containing the specific collagen type I motif recognized by the α1β1 and α2β1 integrins i.e. the hexapeptide sequence portion GFOGER of the α1 chain . Embedding this adhesion epitope into the triple helical collagenous peptide 3 (Figure 1) allowed X-ray structural analysis of the complex with the α2-I domain, which provides within the α2β 1 integrin the principal binding site for collagen .
KeywordsTriple Helix Collagen Peptide Basal Membrane Collagen Adhesion Motif Cell Adhesion Study
The work was funded by the SFB 563 (grant C4) of the DFG.
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