PMID: 7867070

Authors:

Lee JO, Rieu P, Arnaout MA, Liddington R

Title:

Crystal structure of the A domain from the alpha subunit of integrin CR3 (CD11b/CD18).

Journal:

Cell. 1995 Feb 24;80(4):631-8.

Abstract:

We have determined the high resolution crystal structure of the A domain from the alpha chain of integrin CR3. The domain adopts a classic alpha/beta "Rossmann" fold and contains an unusual Mg2+ coordination site at its surface. One of the coordinating ligands is the glutamate side chain from another A domain molecule. We suggest that this site represents a general metal ion-dependent adhesion site (MIDAS) for binding protein ligands. We further propose that the beta subunits of integrins contain a MIDAS motif within a modified A domain. Our crystal structure will allow reliable models to be built for other members of the A domain superfamily and should facilitate development of novel adhesion modulatory drugs.