title: Amino acids and peptides. Part 39: a bivalent poly(ethylene glycol) hybrid containing an active site (RGD) and its synergistic site (PHSRN) of fibronectin.
abstract: Fibronectin contains the active sequence Arg-Gly-Asp (RGD), along with its synergic site Pro-His-Ser-Arg-Asn (PHSRN). However, the PHSRN peptide does not show synergic activity when it is mixed with the RGD peptide, indicating that a spatial array between RGD and PHSRN in fibronectin may be necessary for synergic activity. Here, we have used an amino acid type poly(ethylene glycol) derivative (aaPEG) to design a bivalent PEG hybrid of fibronectin active peptides. We prepared the aaPEG hybrid peptides PHSRN-aaPEG, aaPEG-RGD, and PHSRN-aaPEG-RGD, and tested their biological activity. Whereas aaPEG-RGD promoted cell spreading activity, PHSRN-aaPEG had no activity. The PHSRN-aaPEG-RGD hybrid strongly promoted cell spreading compared with aaPEG-RGD. These results suggest that the PHSRN sequence in the PHSRN-aaPEG-RGD molecule synergistically enhances the cell spreading activity of the RGD sequence, and that the bivalent aaPEG hybrid method may be useful for conjugating functionally active peptides.
authors.affiliation: Faculty of Pharmaceutical Sciences, Kobe Gakuin University, Ikawadani-cho, Nishi-ku, 651-2180, Kobe, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Hojo
authors.forename: Y
authors.initials: Y
authors.lastname: Susuki
authors.forename: M
authors.initials: M
authors.lastname: Maeda
authors.forename: I
authors.initials: I
authors.lastname: Okazaki
authors.forename: M
authors.initials: M
authors.lastname: Nomizu
authors.forename: H
authors.initials: H
authors.lastname: Kamada
authors.forename: Y
authors.initials: Y
authors.lastname: Yamamoto
authors.forename: S
authors.initials: S
authors.lastname: Nakagawa
authors.forename: T
authors.initials: T
authors.lastname: Mayumi
authors.forename: K
authors.initials: K
authors.lastname: Kawasaki
mesh_terms: D020816:Amino Acid Motifs; D000596:Amino Acids / Q000737:chemistry; D001665:Binding Sites; D005353:Fibronectins / Q000737:chemistry*; D009842:Oligopeptides / Q000737:chemistry*; D011092:Polyethylene Glycols / Q000737:chemistry*
chemical_list: D000596:Amino Acids; D005353:Fibronectins; D009842:Oligopeptides; D011092:Polyethylene Glycols; C047981:arginyl-glycyl-aspartic acid