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Acta Crystallogr D Biol Crystallogr. 2002 Oct;58(Pt 10 Pt 2):1858-61. Epub 2002 Sep 28.

Crystallization of cyclase-associated protein from Dictyostelium discoideum.

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Macromolecular Crystallography Laboratory, NCI at Frederick, Frederick, MD 21702, USA.


Cyclase-associated protein (CAP) is a conserved two-domain protein that helps to activate the catalytic activity of adenylyl cyclase in the cyclase-bound state through interaction with Ras, which binds to the cyclase in a different region. With its other domain, CAP can bind monomeric actin and therefore also carries a cytoskeletal function. The protein is thus involved in Ras/cAMP-dependent signal transduction and most likely serves as an adapter protein translocating the adenylyl cyclase complex to the actin cytoskeleton. Crystals belonging to the orthorhombic space group C222, with unit-cell parameters a = 71.2, b = 75.1, c = 162.9 A, have been obtained from Dictyostelium discoideum CAP carrying a C-terminal His tag. A complete native data set extending to 2.2 A resolution was collected from a single crystal using an in-house X-ray system. The asymmetric unit contains one molecule of CAP.

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