1bm3

Publication Abstract from PubMed

Antibodies are important tools to explore receptor-ligand interactions. The anti-integrin antibody OPG2 binds in an RGD-related manner to the alphaIIb beta3 integrin as a molecular mimic of fibrinogen. The Fab fragment from OPG2 was cocrystallized with a peptide from the beta3 subunit of the integrin representing a site that binds RGD. The crystal structure of the complex was determined at 2.2-A resolution and compared with the unbound Fab. On binding the integrin peptide there were conformational changes in CDR3 of the heavy chain. Also, a significant shift across the intermolecular interface between the CH1-CL domains was observed so that the angle of rotation relating the two domains was reduced by 15 degrees. This unusual conformational adjustment represents the first example of ligand-induced conformational changes in the carboxyl domains of a Fab fragment.

Conformational change in an anti-integrin antibody: structure of OPG2 Fab bound to a beta 3 peptide.,Kodandapani R, Veerapandian L, Ni CZ, Chiou CK, Whittal RM, Kunicki TJ, Ely KR Biochem Biophys Res Commun. 1998 Oct 9;251(1):61-6. PMID:9790907^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.