Solanesyl pyrophosphate synthetase from Micrococcus lysodeikticus

Area of Science:

• Biochemistry
• Enzymology

Background:

• Solanesyl pyrophosphate synthetase is involved in the biosynthesis of polyprenyl compounds.
• Understanding its catalytic mechanism is crucial for elucidating isoprenoid metabolism.

Purpose of the Study:

• To purify and characterize solanesyl pyrophosphate synthetase from Micrococcus lysodeikticus.
• To investigate the enzyme's substrate specificity and catalytic activity.

Main Methods:

• Enzyme purification using DEAE-Sephadex, hydroxylapatite, and Sephadex G-100 chromatography.
• Enzymatic assays to determine substrate utilization and product formation.
• Molecular weight estimation via Sephadex G-100 filtration.

Main Results:

• Purified enzyme catalyzes the condensation of isopentenyl pyrophosphate and geranyl pyrophosphate to form C40 and C45 pyrophosphates.
• all-trans-Farnesyl and all-trans-geranylgeranyl pyrophosphates showed lower activity as cosubstrates.
• The enzyme's molecular weight was estimated to be 78,000 Da.

Conclusions:

• The purified enzyme effectively synthesizes long-chain polyprenyl pyrophosphates.
• The enzyme exhibits specific substrate requirements for efficient synthesis.
• A potato enzyme preparation can hydrolyze these polyprenyl pyrophosphates to prenols.