Download MendeleyTrifluoperazine-induced conformational change in Ca(2+)-calmodulin.
Vandonselaar, M., Hickie, R.A., Quail, J.W., Delbaere, L.T.(1994) Nat Struct Biol 1: 795-801
- PubMed: 7634090
- DOI: https://doi.org/10.1038/nsb1194-795
- Primary Citation of Related Structures:
1LIN - PubMed Abstract:
Here we show that, as a consequence of binding the drug trifluoperazine, a major conformational movement occurs in Ca(2+)-calmodulin (CaM). The tertiary structure changes from an elongated dumb-bell, with exposed hydrophobic surfaces, to a compact globular form which can no longer interact with its target enzymes. It is likely that inactivation of Ca(2+)-CaM by trifluoperazine is due to this major tertiary-structural alteration in Ca(2+)-CaM, which is initiated and stabilized by drug binding. This conformational change is similar to that which occurs on the binding of Ca(2+)-CaM to target peptides. Two hydrophobic binding pockets, created by amino acid residues adjacent to Ca(2+)-coordinating residues, form the key recognition sites on Ca(2+)-CaM for both inhibitors and target enzymes.
Organizational Affiliation:
Department of Biochemistry, University of Saskatchewan, Saskatoon, Canada.
