© The Rockefeller University Press,
0021-9525/1998//1523 $5.00
The Journal of Cell Biology, Volume 143, Number 6,
, 1998 1523-1534
Two Functional States of the CD11b A-Domain: Correlations with Key Features of Two Mn2+-complexed Crystal Structures
Rui Li,
Philippe Rieu,
Diana L. Griffith,
David Scott, and
M. Amin Arnaout
Leukocyte Biology and Inflammation Program, Renal Unit, Department of Medicine, Massachusetts General Hospital and Harvard Medical School, Charlestown, Massachusetts 02129
In the presence of bound Mn2+, the three- dimensional structure of the ligand-binding A-domain from the integrin CR3 (CD11b/CD18) is shown to exist in the "open" conformation previously described only for a crystalline Mg2+ complex. The open conformation is distinguished from the "closed" form by the solvent exposure of F302, a direct T209–Mn2+ bond, and the presence of a glutamate side chain in the MIDAS site. Approximately 10% of wild-type CD11b A-domain is present in an "active" state (binds to activation-dependent ligands, e.g., iC3b and the mAb 7E3). In the isolated domain and in the holoreceptor, the percentage of the active form can be quantitatively increased or abolished in F302W and T209A mutants, respectively. The iC3b-binding site is located on the MIDAS face and includes conformationally sensitive residues that undergo significant shifts in the open versus closed structures. We suggest that stabilization of the open structure is independent of the nature of the metal ligand and that the open conformation may represent the physiologically active form.
Key Words: integrin activation A-domain crystal structure complement iC3b G proteins
Abbreviations used in this paper: MFI, mean fluorescence intensity; MIDAS, metal ion–dependent adhesion site; NIF, neutrophil inhibitory factor; WT, wild-type.
Grants from the National Institutes of Health and a fellowship grant from the American Heart Association and the Philippe Foundation supported this work. The Brookhaven National Light Source Facility is supported by the US Department of Energy, Office of Health and Environmental Research, and by the National Science Foundation.

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