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Volume 272, Number 45, Issue of November 7, 1997 pp. 28512-28517
©1997 by The American Society for Biochemistry and Molecular Biology, Inc.

Crystal Structure of the I Domain from Integrin alpha 2beta 1

(Received for publication, May 1, 1997, and in revised form, July 31, 1997)

Jonas Emsley , Sandra L. King Dagger , Jeffrey M. Bergelson Dagger and Robert C. Liddington

From the Department of Biochemistry, University of Leicester, Leicester LE1 7RH, United Kingdom and the Dagger  Division of Infectious Diseases, Dana-Farber Cancer Institute, Boston, Massachusetts 02115

We have determined the high resolution crystal structure of the I domain from the alpha -subunit of the integrin alpha 2beta 1, a cell surface adhesion receptor for collagen and the human pathogen echovirus-1. The domain, as expected, adopts the dinucleotide-binding fold, and contains a metal ion-dependent adhesion site motif with bound Mg2+ at the top of the beta -sheet. Comparison with the crystal structures of the leukocyte integrin I domains reveals a new helix (the C-helix) protruding from the metal ion-dependent adhesion site face of the domain which creates a groove centered on the magnesium ion. Modeling of a collagen triple helix into the groove suggests that a glutamic acid side chain from collagen can coordinate the metal ion, and that the C-helix insert is a major determinant of binding specificity. The binding site for echovirus-1 maps to a distinct surface of the alpha 2-I domain (one edge of the beta -sheet), consistent with data showing that virus and collagen binding occur by different mechanisms. Comparison with the homologous von Willebrand factor A3 domain, which also binds collagen, suggests that the two domains bind collagen in different ways.


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