What is the function of the enzyme phosphoglycerate mutase?

The correct function of phosphoglycerate mutase is to facilitate the conversion of 3-phosphoglycerate to 2-phosphoglycerate. This reaction is crucial in the glycolytic pathway, where phosphoglycerate mutase acts as a isomerase, allowing the rearrangement of the phosphate group within the 3-phosphoglycerate molecule.

This enzyme catalyzes the transfer of a phosphate group from the third carbon of 3-phosphoglycerate to the second carbon, resulting in the formation of 2-phosphoglycerate. This step is important as it prepares the substrate for subsequent reactions that ultimately lead to the production of pyruvate and the generation of energy in the form of ATP.

In the context of the other options, the enzyme does not function to convert 2-phosphoglycerate to phosphoenolpyruvate (PEP), nor does it interconvert 1,3-bisphosphoglycerate and 3-phosphoglycerate, or convert glyceraldehyde 3-phosphate to 1,3-bisphosphoglycerate, as these are tasks fulfilled by other enzymes within the glycolytic pathway.