Purification, Crystallization and Preliminary Crystallographic Analysis of CYP 195A2, a P450 Enzyme from Rhodopseudomonas palustris

Cytochrome P450 monooxygenases are a superfamily of heme-thiolate proteins involved in the metabolism of a wide variety of endogenous and xenobiotic compounds. The P450 enzyme CYP195A2 from Rhodopseudomonas palustris CGA009, a metabolically versatile bacterium, was overproduced in E. coli and purified. Two distinct crystal forms were obtained under separately optimized conditions by the hanging-drop vapor-diffusion method. Native data sets extending to resolutions of 2.3 Å and 2.8 Å have been collected and processed in space groups P222 and C2221 respectively.