Abstract

Most calmodulin (CaM) in apo and Ca2+-bound states show a dumb-bell-like structure, involving the N- and C-terminal domains, connected with a flexible linker. However, Ca2+-bound yeast calmodulin (yCaM) takes on a unique globular structure; the target-binding site of this protein is autoinhibited. We applied NMR relaxation dispersion experiments to yCaM in the Ca2+-bound state. The amide 15N and 1HN relaxation dispersion profiles indicated the presence of conformational dynamics for specific residues at the interface between the N- and C-terminal domains. We conclude that these conformational dynamics were derived from the mobility of the C-terminal domain.

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