Crystallization and preliminary X-ray analysis of cyclophilin from Leishmania donovani

Cyclophilin from the parasite Leishmania donovani is a protein with peptidylprolyl cis-trans isomerase activity, in addition to being a receptor for the drug cyclosporin. Crystals of the enzyme have been obtained in space group P4₃2₁2, with unit-cell parameters a = b = 48.73, c = 140.93 Å, and diffract to 3.5 Å resolution. One molecule per asymmetric unit gives a solvent content and Matthews coefficient of 46% and 2.3 Å³ Da^-1, respectively. Molecular-replacement calculations with human cyclophilin A as the search model give an unambiguous solution in rotation and translation functions.