ACT_SITE 67; /note="Schiff-base intermediate with substrate; via pyruvic acid"; /evidence="ECO:0000256|HAMAP-Rule:MF_00464"; ACT_SITE 72; /note="Proton acceptor; for processing activity"; /evidence="ECO:0000256|HAMAP-Rule:MF_00464"; ACT_SITE 87; /note="Proton donor; for catalytic activity"; /evidence="ECO:0000256|HAMAP-Rule:MF_00464"