Preliminary X-ray data for the calmodulin/trifluoperazine complex.

Crystals of the calmodulin/trifluoperazine complex have been grown from 26% polyethylene glycol 4000 at pH 5.2 with 10 mM-calcium chloride, 10 mM-magnesium chloride and 1.2 mM-trifluoperazine at 14 degrees C. The crystals have space group P3(1)21 or P3(2)21 with a = 40.88 A, c = 180.9 A and Z = 6, and exhibit the forms [1010] and [0001]. There is one calmodulin molecule with two trifluoperazine molecules per asymmetric unit and the solvent content of the crystals is 51% (v/v).