ID 6.4.1.6 DE acetone carboxylase. CA 2 ATP + butan-2-one + 3 H2O + hydrogencarbonate = 3-oxopentanoate + 2 AMP CA + 4 H(+) + 4 phosphate. CC -!- The enzyme from Xanthobacter sp. strain Py2 also carboxylates butan- CC 2-one to 3-oxopentanoate. DR Q8RM04, ACXA_XANP2 ; Q8RM03, ACXB_XANP2 ; Q8RM02, ACXC_XANP2 ; //