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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Specific binding of CAP-50 to calcyclin.

CAP-50, a calcyclin-associated protein with an apparent molecular mass of 50 kDa, was purified and proved to be a novel annexin [Tokumitsu, H. et al. (1992) J. Biol. Chem. 267, 8919-8924]. We examined the binding of CAP-50 to other Ca(2+)-binding proteins which have two of four EF-hand structures, by a co-precipitation assay with phospholipid (phosphatidylserine). Among nine Ca(2+)-binding proteins (calcyclin, S-100 proteins, p11, calgizzarin, calvasculin, calmodulin and troponin C) examined, only calcyclin interacted with CAP-50. These results clearly show that the interaction of CAP-50 to calcyclin is specific, i.e. other Ca(2+)-binding proteins with the EF-hand structure could not substitute for calcyclin, thereby suggesting the possible role in specific regulation of the function of CAP-50 by Ca2+/calcyclin.[1]


  1. Specific binding of CAP-50 to calcyclin. Minami, H., Tokumitsu, H., Mizutani, A., Watanabe, Y., Watanabe, M., Hidaka, H. FEBS Lett. (1992) [Pubmed]
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