Methylmalonyl CoA mutase has been purified over 2300-fold from bovine brain using fractional precipitation, ion exchange resins, and gel filtration procedures. The crude extract had an equal mixture of mutase in the halo- and apoenzyme form. After the final purification step the ratio had changed to 86% holo-enzyme and 14% apoenzyme. The mutase enzyme had a pH optimum of 7. 0 in Tris-HCI buffer. The Km values for L-methylmalonyl CoA and succinyl CoA were 7.7 x 10^-4 M and 1.8 x 10^-4 M respectively. The equiIibrium constant in the direction of succinyl CoA formation was 19. Inhibition with N-ethylmalei-mide was noncompetitive with a K_i of 2.4 x 10^-3 M. The activity level of mutase in the brain was found to be about 5% of that found in liver.
College and Department
Chemistry and Biochemistry
BYU ScholarsArchive Citation
Martin, Damon, "The purification and characterization of methylmalonyl CoA mutase from bovine brain" (1974). Theses and Dissertations. 8305.
Cattle, Physiology, Brain Chemistry