Crystallographic evidence for the structural isomorphism of deer and beef catalase

Summary 2 crystal forms of deer liver catalase have been grown and analyzed by X-ray diffraction. Both are of space group P2₁2₁2₁ with cell dimensions I: a=88.5 Å, b=140.5Å and c=235 Å; II: a=124 Å, b=128 Å and c=154 Å. The first of these 2 forms appears to be virtually isomorphous with crystals of beef liver catalase.Acknowledgment. This research was supported by the National Institutes of Health, grant GM21 398 and RR00576. The authors also wish to thank Wardens John Kreider and Jack Schweitzer of the Pennsylvania Game and Fish Commission for providing the deer liver.