Probable phosphomutase that may have a function related to the manipulation of phosphate groups on carbohydrates. Reduces trehalose-6-phosphate levels when overexpressed in TPS2-deleted cells. Reduces 5'-Phosphoribosyl-4-carboxamide-5-aminoimidazole (AICAR) levels, a metabolic intermediate at the crossroads between AMP and histidine biosynthesis pathways, when overexpressed in a ADE3-ADE16-ADE17 triple deletant. Present with 3250 molecules/cell in log phase SD medium. Belongs to the phosphoglycerate mutase family.