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[Large-scale structural changes of yeast phosphoglycerate kinase molecule upon substrate binding].
Biofizika
|November 1, 1982
Summary
Yeast phosphoglyceratekinase shrinks and becomes less asymmetrical when binding both ATP and 3-phosphoglycerate simultaneously. This structural change was observed using diffuse X-ray scattering.
Area of Science:
- Biochemistry
- Structural Biology
- Biophysics
Background:
- Phosphoglycerate kinase (PGK) is a crucial enzyme in glycolysis.
- Understanding enzyme conformational changes upon substrate binding is key to elucidating catalytic mechanisms.
Purpose of the Study:
- To investigate the structural alterations of yeast phosphoglyceratekinase (PGK) in response to substrate binding.
- To determine how the dimensions and form of PGK change upon interaction with ATP and 3-phosphoglycerate.
Main Methods:
- Diffuse X-ray scattering was employed to analyze the molecular structure.
- The radius of gyration and asymmetry of the PGK molecule were measured.
Main Results:
- Binding of ATP and 3-phosphoglycerate induced significant changes in PGK's molecular dimensions.
- A notable decrease in the radius of gyration was observed, indicating a more compact structure.
- The extent of molecular asymmetry was also reduced upon simultaneous substrate sorption.
Conclusions:
- Yeast phosphoglyceratekinase undergoes a conformational change towards a more compact and less asymmetrical form when both substrates are bound.
- These findings provide insights into the allosteric regulation and structural dynamics of PGK during glycolysis.