Involved in acetate metabolism. acetyl-CoA + phosphate = acetyl phosphate + CoA Metabolic intermediate biosynthesis; acetyl-CoA biosynthesis; acetyl-CoA from acetate: step 2/2. Homohexamer. The N-terminal region seems to be important for proper quaternary structure. The C-terminal region contains the substrate-binding site (By similarity). In the N-terminal section; belongs to the CobB/CobQ family. In the C-terminal section; belongs to the phosphate acetyltransferase and butyryltransferase family. Extended N-terminus.