1opg

OverviewOverview

Cell surface receptors called integrins mediate diverse cell adhesion, phenomena through recognition of the sequence arginine-glycine-aspartic, acid (RGD) present in proteins such as fibronectin and fibrinogen., Platelet aggregation in hemostasis is mediated by the binding of, fibrinogen to the gpIIb/IIIa integrin. The OPG2 antibody binds the, gpIIb/IIIa receptor and acts as a ligand mimic due to the presence of an, arginine-tyrosine-aspartic acid (RYD) sequence in the CDR3 loop of the, heavy chain. The RYD loop and side chains are ordered in the 2.0-A, resolution crystal structure of the Fab fragment from this antireceptor, antibody. Moreover, the RYD loop assumes two clearly defined conformations, that may correspond to the orientations of the loop in the free state or, bound to integrin. This molecule will serve as a tool for understanding, protein-integrin recognition in platelet aggregation and other, RGD-mediated cell adhesion interactions.

About this StructureAbout this Structure

1OPG is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.

ReferenceReference

Crystal structure of the OPG2 Fab. An antireceptor antibody that mimics an RGD cell adhesion site., Kodandapani R, Veerapandian B, Kunicki TJ, Ely KR, J Biol Chem. 1995 Feb 3;270(5):2268-73. PMID:7836460

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