cd04886

C-terminal ACT domain of biodegradative (catabolic) threonine dehydratase II (ThrD-II) and other related ACT domains; This CD includes the C-terminal ACT domain of biodegradative (catabolic) threonine dehydratase II (ThrD-II) and other related ACT domains. The Escherichia coli tdcB gene product, ThrD-II, anaerobically catalyzes the pyridoxal phosphate-dependent dehydration of L-threonine and L-serine to ammonia and to alpha-ketobutyrate and pyruvate, respectively. Tetrameric ThrD-II is subject to allosteric activation by AMP, inhibition by alpha-keto acids, and catabolite inactivation by several metabolites of glycolysis and the citric acid cycle. Also included in this CD are N-terminal ACT domains present in smaller (~170 a.a.) archaeal proteins of unknown function. Members of this CD belong to the superfamily of ACT regulatory domains.