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Proc Natl Acad Sci U S A
1989 Oct 01;8620:7909-13.
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Vertebrate and yeast calmodulin, despite significant sequence divergence, are functionally interchangeable.
Davis TN, Thorner J.
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Yeast strains relying solely on vertebrate (Xenopus laevis) calmodulin, expressed under control of a yeast (GAL1) promoter, grew at the same rate as yeast cells containing their endogenous calmodulin. Therefore, the ability to perform essential functions has been conserved between yeast and vertebrate calmodulins, suggesting that calmodulin performs the same (or overlapping) roles in yeast as it does in higher eukaryotes. Successful substitution of vertebrate for yeast calmodulin also suggests that the two proteins can adopt similar conformations in vivo, despite the large number of amino acid differences between them (60 out of 148 residues). Strains overproducing either vertebrate or yeast calmodulin about 100-fold and a strain producing a normal level of yeast calmodulin were essentially indistinguishable in many characteristics, including microtubule distribution, rate of secretion, response to mating pheromone, sporulation, and adaptation to nutrient limitation. Calmodulin overproduction did not confer elevated resistance to a phenothiazine drug, trifluoperazine, thought to be a calmodulin-specific inhibitor. These results have important implications for understanding the role of calmodulin in intracellular calcium signaling.
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