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Polyamine N-acetyltransferase from Fasciola hepatica
1Department of Biochemical Parasitology, Bernhard Nocht Institute for Tropical Medicine, Hamburg, F.R.G.
Molecular and Biochemical Parasitology
|March 1, 1992
Summary
Researchers purified a cytosolic polyamine N-acetyltransferase from Fasciola hepatica. This enzyme acetylates polyamines and diamines, differing from mammalian counterparts by acetylating putrescine.
Area of Science:
- Biochemistry
- Parasitology
- Enzymology
Background:
- Polyamines are crucial for cell growth and function.
- Polyamine metabolism is essential for parasite survival and pathogenesis.
- N-acetyltransferases play a role in polyamine regulation.
Purpose of the Study:
- To partially purify and characterize a cytosolic polyamine N-acetyltransferase from the liver fluke Fasciola hepatica.
- To investigate the substrate specificity and kinetic properties of the trematode acetylase.
- To explore the potential role of polyamine acetylation in parasite physiology.
Main Methods:
- Partial purification of the enzyme from Fasciola hepatica liver fluke.
- Enzyme activity assays using various polyamine and diamine substrates.
- Determination of kinetic parameters (Km, Ki) for substrates and inhibitors.
- Investigation of cofactor and sulfhydryl group dependency.
Main Results:
- The enzyme, with an apparent Mr of 50,000, acetylates putrescine, unlike mammalian enzymes.
- Spermidine showed the highest reaction rate, while putrescine had the lowest Km.
- The enzyme is dependent on sulfhydryl groups and is inhibited by Coenzyme A and specific polyamine analogues.
Conclusions:
- The Fasciola hepatica acetylase exhibits distinct substrate specificity compared to mammalian counterparts.
- Polyamine acetylation may facilitate polyamine transport and excretion in trematodes.
- This acetylation process could be a regulatory mechanism in parasite polyamine metabolism.