Bchbasic
The enzyme that catalyzes the transfer of phosphate from 1,3-bisphosphoglycerate to adenosine diphosphate (ADP) is _____.
Answer
phosphoglycerate kinase
Explanation
### Why this is right
Phosphoglycerate kinase transfers a high-energy phosphate from 1,3-bisphosphoglycerate to ADP, forming adenosine triphosphate (ATP) and 3-phosphoglycerate. This is substrate-level phosphorylation, meaning ATP is formed directly from a metabolic intermediate.
### The concept
This ATP-producing reaction occurs once for each triose phosphate, so it occurs twice per glucose. It is distinct from the later ATP-forming reaction catalyzed by pyruvate kinase.
### Terms
- **ADP**: Adenosine diphosphate, which can accept a phosphate to form ATP.
- **ATP**: Adenosine triphosphate, a cellular energy-transfer molecule.
- **Substrate-level phosphorylation**: Direct formation of ATP by transferring phosphate from a substrate.
### Remember
Phosphoglycerate kinase acts at the 1,3-bisphosphoglycerate step.
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