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Hypothetical role of AcuA and AcuC enzymes on acetoin catabolism. AcoABC, acetoin dehydrogenase enzyme system; AcoA, a subunit of the TPP-dependent acetoin dehydrogenase; AcoB, b subunit of the TPP-dependent acetoin dehydrogenase; AcoC, dihydrolipoamide dehydrogenase; AcuA, protein acetyltransferase; AcuC, protein deacetylase; GltA, citrate synthase. The bracketed numbers are as follows: 1, acetoin; 2, acetyl-CoA; 3, acetate; 4, oxaloacetate; 5, citrate. 2e−, two reducing equivalents.
