Summary: A study has been made in methanol- and ethanol-grown x of the specific activities of the following enzymes: serine hydroxymethyltransferase, serine-glyoxylate aminotransferase, hydroxypyruvate reductase, glycerate kinase, phosphopyruvate hydratase, phosphopyruvate carboxylase, serine dehydratase, malate dehydrogenase (decarboxylating), phosphopyruvate synthase, phosphopyruvate carboxykinase, glycerate phosphomutase, malate dehydrogenase, malate lyase (CoA acetylating-ATP cleaving), citrate synthase, aconitate hydratase, isocitrate lyase and malate synthase. It was concluded that during growth on ethanol the glyoxylate cycle operated, while during growth on methanol, C units and glyoxylate were converted to malate by the serine pathway. The glyoxylate was regenerated by cleavage of malate into glyoxylate and acetyl-CoA. The acetyl-CoA was itself oxidized to glyoxylate by some of the reactions of the tricarboxylic acid cycle and isocitrate lyase, thus permitting net synthesis of C and C compounds from methanol and carbon dioxide.


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