Drug binding by calmodulin: crystal structure of a calmodulin-trifluoperazine complex.Cook, W.J., Walter, L.J., Walter, M.R.
(1994) Biochemistry 33: 15259-15265
- PubMed: 7803388
- DOI: https://doi.org/10.1021/bi00255a006
- Primary Citation of Related Structures:
- PubMed Abstract:
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.
Department of Pathology, University of Alabama at Birmingham 35294.