Acylphosphatase is one of the smallest enzymes, with only 98 residues. The exact biological function of ACP (Acylphosphatase) is unknown, but may involve regulation in all metabolic pathways involving acylphosphates, especially glycolysis and pyrimidine biosynthesis. It is found in many vertebrate tissues in two homologous isoforms. This entry represents the common type isoform.