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The photosynthetic protozoon Euglena gracilis Z contains adenosylcobalamin-dependent methylmalonyl-CoA mutase (MCM) involved in propionate metabolism. The specific activity of the Euglena mutase was about 6.5-fold greater in propionate-adapted Euglena cells than in photoautotrophic cells (control). Although the control cells contained only one mutase (apparent M(r) 72,000), the propionate-adapted cells contained two mutases with M(r) values of 72,000 and 17,000; both enzymes were located in the mitochondria. These results provide evidence that propionate-adapted Euglena contains two MCM isozymes. The induced mutase (M(r) 17,000) permits photoassimilation of propionate.
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