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An intermediate in the degradation of several metabolites (for example, valine, methionine, odd-chain fatty acids, theronine); elevated in cases of pernicious anemia.
Farlex Partner Medical Dictionary © Farlex 2012
References in periodicals archive ?
This is a global, multi-center, non-interventional study for patients with confirmed diagnosis of MMA due to methylmalonyl-CoA mutase deficiency or PA.
This reaction requires the involvement of three enzymes: propionyl-CoA-carboxylase, methylmalonyl-CoA-racemase and methylmalonyl-CoA mutase (Voet et al., 2008).
Keywords: Methylmalonic aciduria, Methylmalonyl-CoA mutase deficiency, Cobalamin related remethylation disorders, Vitamin B 12 deficiency, Pakistan.
Several enzymes are involved in the incorporation of these substrates in the gluconeogenesis pathway [3]: lactate dehydrogenase (LDH) for lactate; glycerol kinase (GK) and glycerol-3-phosphate dehydrogenase (GPD) for glycerol; and acyl-CoA synthetase short-chain family member 3 (ACSS3), propionyl-CoA carboxylase (PCC), methylmalonyl-CoA epimerase (MCEE), and methylmalonyl-CoA mutase (MUT) for propionate.
The data, published online in the journal Cell Reports, demonstrate that intravenous administration of an mRNA therapeutic encoding for human methylmalonyl-CoA mutase, the enzyme most frequently mutated in MMA, enabled liver expression of MUT in MMA mouse models, leading to a significant reduction in methylmalonic acid, a substantial improvement in weight gain, and the complete survival of the full cohort of treated mice versus control group.
Vitamin [B.sub.12] [cobalamin (Cbl)] plays an essential role both in the conversion of methylmalonyl-CoA to succinyl-CoA and in the synthesis of methionine (Met) from homocysteine (Hcy) (Fig.
The other Cbl-dependent reaction is the conversion of methylmalonyl-CoA to succinyl-CoA.
MMA is a compound that can build up in the bloodstream if there isn't enough vitamin B12 in the body for an enzyme, methylmalonyl-CoA mutase, to function properly.
This vitamin exerts its physiological action through two enzymatic pathways: the first acts as a co-factor for the methionine synthase enzyme that converts homocysteine into methionine and the second acts upon L-methylmalonyl Coenzyme A (CoA) mutase enzyme to convert methylmalonyl-CoA into succinyl-CoA4.
MMA can build up in the bloodstreamif there is not enough vitamin [B.sub.12] in the body for an enzyme (methylmalonyl-CoA mutase) to function properly.
D-methylmalonyl CoA is isomerized to L-methylmalonyl CoA via methylmalonyl-CoA racemase.