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- W1504989678 abstract "Synergistic sites in the central cell-adhesive domain of fibronectin (FN) substantially enhance cell adhesion mediated by the alpha 5 beta 1 integrin receptor for fibronectin. We characterized a critical minimal sequence needed for synergistic activity using site-directed mutagenesis and homology scanning using intramolecular chimeras. The minimal cell-binding domain of FN consisting of the 9th and 10th type III FN repeat was expressed in an Escherichia coli expression system. This protein retained high biological activity when assayed using a competitive inhibition assay for FN-mediated adhesion of baby hamster kidney or HT-1080 cells. In contrast, a construct consisting of the 8th and 10th repeat displayed very low biological activity. By replacing various portions of the 8th repeat with homologous 9th repeat segments, we mapped the synergistic region to the center of the 9th repeat. When a very short peptide sequence, Pro-His-Ser-Arg-Asn (PHSRN), from the 9th repeat was substituted for the homologous pentapeptide site in the 8th repeat sequence, the recombinant protein showed markedly enhanced activity. Further mutagenesis analysis suggested that the arginine residue of this pentapeptide sequence is important for function. We also identified a weaker adjacent synergy region other than the PHSRN region. Epitope mapping of an anti-FN monoclonal antibody that inhibits FN-mediated adhesion identified the same critical regions. A synthetic peptide containing the PHSRN sequence showed neither competitive inhibitory activity in solution nor synergy with a soluble RGD-containing peptide. However, when the same synthetic peptide was positioned via a covalent bond at the corresponding site of the normally inactive 8th repeat, it mediated an enhancement of adhesive activity. These results identify a pentapeptide site that synergistically enhances the cell-adhesive activity of the FN RGD sequence." @default.
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- W1504989678 date "1994-10-01" @default.
- W1504989678 modified "2023-10-14" @default.
- W1504989678 title "The short amino acid sequence Pro-His-Ser-Arg-Asn in human fibronectin enhances cell-adhesive function." @default.
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- W1504989678 doi "https://doi.org/10.1016/s0021-9258(17)31456-4" @default.
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