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Phosphofructokinase interacts with molecular chaperonins GroEL and GroES
1MTA-POTE Genetic Research Group of Hungarian Academy of Sciences, Department of Genetics, University Medical School of Pécs, Hungary.
Acta Biologica Hungarica
|January 1, 1997
Summary
Bacterial chaperonins GroEL and GroES interact with phosphofructokinase (PFK). GroEL binding inhibits PFK activity, while the GroEL-GroES complex promotes PFK folding and restores enzyme activity.
Area of Science:
- Biochemistry
- Molecular Biology
- Enzymology
Background:
- Chaperonins are crucial for protein folding and cellular proteostasis.
- Phosphofructokinase (PFK) is a key glycolytic enzyme regulated by various factors.
Purpose of the Study:
- To investigate the interaction between bacterial chaperonins GroEL/GroES and phosphofructokinase (PFK).
- To elucidate the functional consequences of this interaction on PFK activity and folding.
Main Methods:
- Co-purification of bacterial chaperonins GroEL, GroES, and PFK from heat-treated E. coli.
- Enzyme activity assays to measure PFK function under different conditions (Mg2+, ATP, GroEL, GroES).
Main Results:
- GroEL directly interacted with PFK in the presence of Mg2+, leading to decreased enzyme activity.
- GroES addition reversed the GroEL-mediated inhibition of PFK.
- ATP addition to the GroEL-PFK complex facilitated GroEL release and recovered PFK activity.
- A complete refolding system (GroEL, GroES, ATP, Mg2+) enhanced the activity of heat-treated bacterial and rabbit muscle PFK.
Conclusions:
- PFK interacts with GroEL, resulting in enzyme binding and activity loss.
- The GroEL-GroES complex, in conjunction with ATP and Mg2+, promotes PFK folding and/or assembly, restoring enzyme activity.
- These findings highlight the role of chaperonins in maintaining the functional integrity of PFK.