Catalyzes the interconversion of 2-phosphoglycerate and 3-phosphoglycerate. (2R)-2-phosphoglycerate = (2R)-3-phosphoglycerate Carbohydrate degradation; glycolysis; pyruvate from D-glyceraldehyde 3-phosphate: step 3/5. Homodimer. Inhibited by vanadate. Inhibition can partially be relieved by EDTA. Belongs to the phosphoglycerate mutase family. The original start site is 14 aa downstream of the start site shown here. Experiments from PubMed:17576516 were carried out with the original sequence. Extended N-terminus.