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Rat annexin V crystal structure: Ca(2+)-induced conformational changes
NO Concha,JF Head,MA Kaetzel, Dedman JR,
and
BA Seaton
Department of Physiology, Boston University School of Medicine, MA 02118.
Annexins are a family of calcium- and phospholipid-binding proteins implicated in mediating membrane-related processes such as secretion, signal transduction, and ion channel activity. The crystal structure of rat annexin V was solved to 1.9 angstrom resolution by multiple isomorphous replacement. Unlike previously solved annexin V structures, all four domains bound calcium in this structure. Calcium binding in the third domain induced a large relocation of the calcium-binding loop regions, exposing the single tryptophan residue to the solvent. These alterations in annexin V suggest a role for domain 3 in calcium-triggered interaction with phospholipid membranes.
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