1n41
Crystal Structure of Annexin V K27E MutantCrystal Structure of Annexin V K27E Mutant
Structural highlights
Function[ANXA5_RAT] This protein is an anticoagulant protein that acts as an indirect inhibitor of the thromboplastin-specific complex, which is involved in the blood coagulation cascade. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedAnnexin V is an abundant eukaryotic protein that binds phospholipid membranes in a Ca(2+)-dependent manner. In the present studies, site-directed mutagenesis was combined with x-ray crystallography and solution liposome binding assays to probe the functional role of a cluster of interfacial basic residues in annexin V. Four mutants were investigated: R23E, K27E, R61E, and R149E. All four mutants exhibited a significant reduction in adsorption to phospholipid membranes relative to the wild-type protein, and the R23E mutation was the most deleterious. Crystal structures of wild-type and mutant proteins were similar except for local changes in salt bridges involving basic cluster residues. The combined data indicate that Arg(23) is a major determinant for interfacial phospholipid binding and participates in an intermolecular salt bridge that is key for trimer formation on the membrane surface. Together, crystallographic and solution data provide evidence that the interfacial basic cluster is a locus where trimerization is synergistically coupled to membrane phospholipid binding. Interfacial basic cluster in annexin V couples phospholipid binding and trimer formation on membrane surfaces.,Mo Y, Campos B, Mealy TR, Commodore L, Head JF, Dedman JR, Seaton BA J Biol Chem. 2003 Jan 24;278(4):2437-43. Epub 2002 Oct 24. PMID:12401794[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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