Structure and activity of phosphoglycerate mutase

Area of Science:

• Biochemistry
• Enzymology
• Structural Biology

Background:

• Yeast phosphoglycerate mutase is crucial in glycolysis.
• Understanding its mechanism is key to metabolic pathway insights.

Purpose of the Study:

• To elucidate the catalytic mechanism of yeast phosphoglycerate mutase.
• To correlate structural findings with enzymatic activity.

Main Methods:

• X-ray crystallography for structural determination.
• Amino acid sequence analysis.
• Chemical, kinetic, and mechanistic studies.

Main Results:

• Identified two active site histidine residues.
• Observed imidazole groups positioned near substrate binding sites (0.4 nm apart).
• Proposed a ping-pong mechanism involving histidine in phosphoryl transfer.

Conclusions:

• The enzyme likely operates via a ping-pong mechanism.
• Active site histidines are critical for catalysis.
• The C-terminal region plays a significant role in enzyme function.