ACT_SITE 113; /note="Schiff-base intermediate with substrate; via pyruvic acid"; /evidence="ECO:0000255|HAMAP-Rule:MF_00465"; ACT_SITE 118; /note="Proton acceptor; for processing activity"; /evidence="ECO:0000255|HAMAP-Rule:MF_00465"; ACT_SITE 141; /note="Proton donor; for catalytic activity"; /evidence="ECO:0000255|HAMAP-Rule:MF_00465"