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    Biochemistry. 1994 Dec 27;33(51):15259-65.

    Drug binding by calmodulin: crystal structure of a calmodulin-trifluoperazine complex.

    Cook WJ, Walter LJ, Walter MR.

    Department of Pathology, University of Alabama at Birmingham 35294.

    The crystal structure of calmodulin (CaM) bound to trifluoperazine (TFP) has been determined and refined to a resolution of 2.45 A. Only one TFP is bound to CaM, but that is sufficient to cause distortion of the central alpha-helix and juxtaposition of the N- and C-terminal domains similar to that seen in CaM-polypeptide complexes. The drug makes extensive contacts with residues in the C-terminal domain of CaM but only a few contacts with one residue in the N-terminal domain. The structure suggests that substrate binding to the C-terminal domain is sufficient to cause the conformational changes in calmodulin that lead to activation of its targets.

    PMID: 7803388 [PubMed - indexed for MEDLINE]

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