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Purification and characterization of fatty acid synthetase from Cryptococcus neoformans
Y A Mahmoud1, S M Abu el Souod, W G Niehaus
1Department of Biochemistry, Virginia Tech, Blacksburg 24061-0308, USA.
Mycopathologia
|January 1, 1996
Summary
This study purified fatty acid synthetase from Cryptococcus neoformans, revealing its enzyme kinetics and inhibition by polyanionic polymers like heparin and dextran sulfate.
Area of Science:
- Biochemistry
- Enzymology
- Mycology
Background:
- Fatty acid synthesis is crucial for cellular function.
- Fatty acid synthetase (FAS) is a key enzyme complex in this pathway.
- Understanding fungal FAS is important for drug development and biological insights.
Purpose of the Study:
- To purify and characterize fatty acid synthetase from the pathogenic fungus Cryptococcus neoformans.
- To elucidate the enzyme kinetics and substrate specificities.
- To investigate novel inhibition mechanisms.
Main Methods:
- Purification of fatty acid synthetase using biochemical assays.
- Enzyme kinetics studies including K(m) determination and product inhibition analysis.
- Investigation of inhibition by polyanionic polymers (heparin, dextran sulfate).
Main Results:
- Fatty acid synthetase was purified 450-fold with high specific activity.
- The enzyme comprises two non-identical subunits.
- Kinetic analysis revealed substrate affinities and a multisite ping-pong mechanism.
- Polyanionic polymers, particularly high molecular weight dextran sulfate, potently inhibited the enzyme.
Conclusions:
- This is the first purification of fatty acid synthetase from a basidiomycete.
- The enzyme kinetics are consistent with known FAS mechanisms.
- Polyanionic polymers represent a novel class of inhibitors for fungal fatty acid synthetase, suggesting potential therapeutic applications.