Metalloproteins/metalloenzymes for the synthesis of acetyl-CoA in the Wood-Ljungdahl pathway

This paper focuses on the group of metalloproteins/metalloenzymes in the acetyl-coenzyme A synthesis pathway of anaerobic microbes called Wood-Ljungdahl pathway, including formate dehydrogenase (FDH), corrinoid iron sulfur protein (CoFeSP), acetyl-CoA synthase (ACS) and CO dehydrogenase (CODH). FDH, a key metalloenzyme involved in the conversion of carbon dioxide to methyltetrahydrofolate, catalyzes the reversible oxidation of formate to carbon dioxide. CoFeSP, as a methyl group transformer, accepts the methyl group from CH3-H4 folate and then transfers it to ACS. CODH reversibly catalyzes the reduction of CO2 to CO and ACS functions for acetyl-coenzyme A synthesis through condensation of the methyl group, CO and coenzyme A, to finish the whole pathway. This paper introduces the structure, function and reaction mechanisms of these enzymes.

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