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Human phosphoglucose isomerase: expression, purification, crystallization and preliminary crystallographic analysis
A T Cordeiro1, P H Godoi, L F Delboni
1Laboratory of Protein Crystallography and Structural Biology, Physics Institute of São Carlos, University of São Paulo - USP, Av. Trabalhador Sãocarlense 400, PO Box 369, 13566-590 São Carlos - SP, Brazil.
Summary
Phosphoglucose isomerase (PGI) is crucial in glycolysis and acts as a cytokine. This study details the cloning, purification, and crystallization of human PGI, providing structural insights for its dual functions.
Area of Science:
- Biochemistry
- Structural Biology
- Molecular Biology
Background:
- Phosphoglucuse isomerase (PGI) is a key glycolytic enzyme catalyzing aldose-ketose isomerization.
- Extracellular PGI exhibits cytokine and growth factor activities, suggesting diverse biological roles.
Purpose of the Study:
- To clone and purify human phosphoglucose isomerase (hPGI).
- To obtain high-resolution crystal structures of hPGI for structural and functional analysis.
Main Methods:
- Human PGI gene cloning and enzyme expression.
- Protein purification to homogeneity.
- Isomorphous crystallization and X-ray diffraction data collection to 2.6 A resolution.
Main Results:
- Purified hPGI was crystallized under two conditions, yielding crystals in the P2(1)2(1)2(1) space group.
- A 94.7% complete dataset was processed, revealing the asymmetric unit contains two hPGI dimers.
- Molecular replacement confirmed the presence of two hPGI dimers in the asymmetric unit.
Conclusions:
- The structural data provides a foundation for understanding hPGI's enzymatic and extracellular functions.
- This work facilitates further investigation into PGI's role as both a metabolic enzyme and a signaling molecule.