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The structural stability of calmodulin was studied by 1 H-nuclear magnetic resonance spectroscopy under different denaturing conditions. The presence of Ca 2+ stabilizes the structural properties of the native protein. In the absence of calcium the structural integrity of calmodulin can easily be affected by elevated temperatures or by high concentrations of denaturing agents...
Ca 4 .calmodulin (Ca 4 .CaM) inhibits the glycolytic enzyme phosphofructokinase, by preventing formation of its active tetramer. Fluorescence titrations show that the affinity of complex formation of Ca 4 .CaM with the key 21-residue target peptide increases 1000-fold from pH 9.0 to 4.8, suggesting the involvement of histidine and carboxylic acid residues. 1 H NMR pH...
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