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Dynamic interaction between components of hexaprenyl diphosphate synthase from Micrococcus luteus BP-26
1Chemical Research Institute of Non-Aqueous Solutions, Tohoku University, Sendai, Japan.
Biochemistry
|October 20, 1987
Summary
Hexaprenyl diphosphate synthase from Micrococcus luteus BP-26 dissociates into components A and B. These components form a functional enzyme aggregate (A-B-FPP-Mg2+) only when Mg2+ and substrates are present, indicating an enzyme catalysis intermediate.
Area of Science:
- Enzymology
- Protein biochemistry
- Microbial metabolism
Background:
- Hexaprenyl diphosphate synthase from Micrococcus luteus BP-26 is known to dissociate into two essential components, A and B.
- Previous studies utilized hydroxyapatite chromatography to demonstrate this dissociation.
Purpose of the Study:
- To further characterize the dissociation and aggregation behavior of hexaprenyl diphosphate synthase components A and B.
- To investigate the formation of functional enzyme complexes in the presence of substrates and Mg2+.
Main Methods:
- Sephadex G-100 chromatography
- DEAE ion-exchange chromatography
- Superose 12 gel filtration
- Analysis of protein aggregation under varying conditions (concentration, ionic strength, substrate presence).
Main Results:
- Both components A and B exhibit concentration-dependent self-aggregation.
- Component B's apparent molecular mass ranges from 18-49 kDa, while component A ranges from 13-24 kDa.
- A functional enzyme aggregate (A-B-FPP-Mg2+) forms only upon incubation with Mg2+ and substrates, suggesting an enzyme catalysis intermediate.
Conclusions:
- Hexaprenyl diphosphate synthase components A and B exist in dynamic self-aggregated states.
- Substrate and Mg2+ binding are crucial for the formation of the active enzyme complex, representing a key step in catalysis.