Preliminary Crystallographic Data for Cytochrome c Peroxidase from Bakers' Yeast

An X-ray crystallographic investigation of the enzyme cytochrome c peroxidase is in progress. This report gives the unit cell dimensions of the native enzyme (space group P221221221) for samples crystallized by dialysis in various buffer systems. X-ray single crystal investigations of the protoporphyrin IX-apoenzyme complex and of the enzyme with p-chloromercuricbenzoate bound to the sulfhydryl group have shown that both of these materials are isomorphous with the native enzyme.