2.3.3.14 | acetyl-CoA + H2O + 2-oxoglutarate = (2R)-2-hydroxybutane-1,2,4-tricarboxylate + CoA |
mechanism: 2-oxoglutarate first binds to the active site zinc via its alpha-carboxylate and 2-oxo groups, followed by acetyl-CoA. A general base then accepts a proton from the methyl of acetyl-CoA, and a general acid protonates the carbonyl of 2-oxoglutarate in the formation of homocitryl-CoA. The general acid then acts as a base in deprotonating Zn-OH2 in the hydrolysis of homocitryl-CoA to give homocitrate and CoA |
672072 |