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• W2023555823 abstract "We have replaced the semiconserved Gly in the IQ domain consensus sequence with Ala, Arg, or Met in a reference sequence and determined how this affects its complexes with calmodulin. The K(d) for the Ca(2+)-free reference complex is 2.4 +/- 0.3 microM. The Ala and Arg replacements increase this to 5.4 +/- 0.4 and 6.2 +/- 0.5 microM, while the Met increases it to 26.4 +/- 2.5 microM. When Ca(2+) is bound to both calmodulin lobes, the K(d) for the reference complex is not significantly affected, but the K(d) for the Ala variant decreases to 0.9 +/- 0.04 microM, and the values for the Arg and Met variants decrease to 0.4 +/- 0.03 microM. Using mutant calmodulins, we defined the effect of Ca(2+) binding to each lobe, with the C-terminal preceding the N-terminal (C-->N) or vice versa (N-->C). In the C-->N order the first step increases the reference K(d) approximately 5-fold, while it decreases the values for the variants approximately 2- to approximately 10-fold. The second step decreases the K(d) values for the all of the complexes approximately 5-fold, suggesting that the N-terminal lobe does not interact with the semiconserved position after the first step. In the N-->C order the first step increases the K(d) values for the reference complex and Met and Ala variants approximately 15- to approximately 200-fold but does not affect the value for the Arg variant. The second step decreases the K(d) values for the reference and Arg variant approximately 10- and approximately 15-fold and the Ala and Met variants approximately 2000-fold. Thus, both steps in the N-->C order are sensitive to variations at the semiconserved position, while only the first is in the C-->N order. Due to energy coupling, this order is followed under equilibrium conditions." @default.
• W2023555823 created "2016-06-24" @default.
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• W2023555823 date "2009-12-10" @default.
• W2023555823 modified "2023-09-24" @default.
• W2023555823 title "Variations at the Semiconserved Glycine in the IQ Domain Consensus Sequence Have a Major Impact on Ca²⁺-Dependent Switching in Calmodulin−IQ Domain Complexes" @default.
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• W2023555823 doi "https://doi.org/10.1021/bi901695p" @default.
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