ArticleJournal of protein chemistry1990
Properties of CAR-kinase: the enzyme that phosphorylates the cAMP chemotactic receptor of D. discoideum.
Article in Journal of protein chemistry, 1990. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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Abstract
The cell surface cAMP chemotactic receptor of D. discoideum can be phosphorylated in partially purified plasma membrane preparations in a ligand-dependent manner. CAR-kinase, the enzyme responsible for receptor phosphorylation, was shown to be an integral membrane protein. It could utilize either ATP or GTP to phosphorylate the receptor, although ATP was much more efficient. The apparent affinity constant for ATP was approximately 20-25 microM. Maximum CAR-kinase activity was observed between pH 6.5 and pH7, and required the presence of Mg2+. Neither Mn2+ nor Ca2+ could substitute for that divalent cation. The enzyme was found to be sensitive to the ionic strength and temperature of the incubation reaction. Dephosphorylation of the receptor was not observed in the membrane preparations, indicating that the enhanced level of receptor phosphorylation that occurred upon ligand binding was not an indirect reflection of receptor dephosphorylation and subsequent incorporation of radiolabeled phosphate.
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