Acetone carboxylase is the key enzyme of bacterial acetone metabolism, catalysing the condensation of acetone and CO(2) to form acetoacetate.

1: Biochemical, molecular, and genetic analyses of the acetone carboxylases from Xanthobacter autotrophicus strain Py2 and Rhodobacter capsulatus strain B10. Sluis MK, Larsen RA, Krum JG, Anderson R, Metcalf WW, Ensign SA; J Bacteriol. 2002;184:2969-2977. PMID:12003937