ID 6.3.2.11 DE carnosine synthase. AN carnosine synthetase. CA ATP + beta-alanine + L-histidine = ADP + carnosine + H(+) + phosphate. CC -!- This enzyme was thought to form AMP, but studies with highly purified CC enzyme proved that it forms ADP. CC -!- Carnosine is a dipeptide that is present at high concentrations in CC skeletal muscle and the olfactory bulb of vertebrates. CC -!- It is also found in the skeletal muscle of some invertebrates. CC -!- The enzyme can also catalyze the formation of homocarnosine from CC 4-aminobutyrate and L-histidine, with much lower activity. DR D3KCC4, CRNS1_CHICK; A5YM72, CRNS1_HUMAN; Q6ZPS2, CRNS1_MOUSE; //