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The Journal of Immunology, Vol 156, Issue 2 719-726, Copyright © 1996 by American Association of Immunologists

ARTICLES

Structural requirements for mucosal vascular addressin binding to its lymphocyte receptor alpha 4 beta 7. Common themes among integrin-Ig family interactions

MJ Briskin, L Rott and EC Butcher
Department of Pathology, Standford University School of Medicine, CA 94305-5324, USA.

The mucosal vascular addressin, MAdCAM-1, is an Ig family adhesion receptor preferentially expressed by venular endothelial cells at sites of lymphocyte extravasation in mucosal lymphoid tissues and lamina propria. MAdCAM-1 binds the lymphocyte homing receptor for Peyer's patches, the integrin alpha 4 beta 7. We describe a point mutation within the first Ig domain of MAdCAM-1 that abolishes activation- independent alpha 4 beta 7 binding. This point mutation resides within an eight-amino acid motif with homology to sequences important for the integrin binding ability of the related vascular Ig family members, ICAM-1 and VCAM-1. To understand the contributions of the individual MAdCAM-1 domains, chimeric exchanges with the beta 1 integrin ligand, ICAM-1, were made. The two N-terminal domains of MAdCAM-1 are sufficient to confer alpha 4 beta 7 binding comparable to that of native MAdCAM-1. A chimera containing only the N-terminal Ig domain (domain 1) of MAdCAM-1 can also bind (to a lesser extent) alpha 4 beta 7, but only after integrin (to a lesser extent) alpha 4 beta 7, but only after integrin activation. Conversely, the first domain of ICAM-1 appears sufficient to bind activated LFA-1. These data suggest that the first domain of MAdCAM-1 is sufficient for interaction with alpha 4 beta 7, but that sequences within the second domain support this interaction, either by providing additional contact points for integrin binding or by contributing to the conformation or presentation of the N- terminal domain. The second domain of MAdCAM-1 can also support activation-dependent LFA-1 binding to domain 1 of ICAM-1. The findings parallel studies of VCAM-1 binding to alpha 4 beta 1 and suggest that structural differences exist between vascular Ig-like ligands for alpha 4 vs beta 2 integrins.


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