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Crystal structure of human bisphosphoglycerate mutase
Yanli Wang1, Zhiyi Wei, Qian Bian
1National Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China.
The Journal of Biological Chemistry
|July 20, 2004
Summary
The first crystal structure of human bisphosphoglycerate mutase reveals key structural differences from phosphoglycerate mutase. These variations, particularly involving Gly-14 and Glu-13, explain the distinct enzymatic activities and substrate binding.
Area of Science:
- Biochemistry
- Structural Biology
- Enzymology
Background:
- Bisphosphoglycerate mutase (BPGM) synthesizes 2,3-bisphosphoglycerate, an essential allosteric effector of hemoglobin.
- Understanding BPGM structure is crucial for elucidating its unique enzymatic functions.
Purpose of the Study:
- To determine the first crystal structure of human bisphosphoglycerate mutase.
- To elucidate the structural basis for BPGM's distinct enzymatic activities compared to phosphoglycerate mutase.
Main Methods:
- Cloning and expression of the human BPGM gene in Escherichia coli.
- X-ray crystallography to obtain and refine the protein structure to 2.5 A resolution.
- Analysis of structural differences and conformational changes.
Main Results:
- The crystal structure of human BPGM was determined, revealing a dimeric state.
- Significant structural variations were identified in specific regions and the C-terminal tail compared to cofactor-dependent phosphoglycerate mutase.
- Specific residues, including Gly-14 and Glu-13, were implicated in conformational changes affecting substrate binding and enzyme activity.
Conclusions:
- The determined structure provides insights into the distinct catalytic mechanisms of BPGM.
- Structural variations explain the altered substrate binding and reduced mutase activity of BPGM.
- This work lays the foundation for further functional and mechanistic studies of BPGM.