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Measuring Dynamic Glycosomal pH Changes in Living Trypanosoma brucei
Published on: January 19, 2024
A novel phospholipase from Trypanosoma brucei
Gregory S Richmond1, Terry K Smith
1Wellcome Trust Biocentre, Division of Biological Chemistry and Molecular Microbiology, College of Life Sciences, University of Dundee, Scotland, UK.
Molecular Microbiology
|January 24, 2007
Summary
This study identifies the first cytosolic phospholipase A1 (PLA(1)) from Trypanosoma brucei, revealing its unique bacterial origins and function in synthesizing specific lysophosphatidylcholine metabolites.
Area of Science:
- Biochemistry
- Molecular Biology
- Parasitology
Background:
- Phospholipase A1 (PLA(1)) characterization lags behind other phospholipases.
- Cytosolic PLA(1) enzymes are widespread but poorly understood.
- Trypanosoma brucei is a significant parasite of humans and livestock.
Purpose of the Study:
- To clone and characterize the first cytosolic phospholipase A1 (PLA(1)) from Trypanosoma brucei.
- To investigate the evolutionary origin and in vivo function of TbPLA(1).
- To elucidate the catalytic mechanism of TbPLA(1).
Main Methods:
- Cloning and characterization of Trypanosoma brucei phospholipase A1 (TbPLA(1)).
- Nano-electrospray ionization tandem mass spectrometry for in vivo analysis of TbPLA(1) mutants.
- Biochemical analysis of purified recombinant TbPLA(1) to determine its catalytic mechanism.
Main Results:
- TbPLA(1) is a cytosolic enzyme with preference for phosphatidylcholine (GPCho) substrates.
- TbPLA(1) is evolutionarily related to bacterial PLA(1), likely acquired via horizontal gene transfer.
- TbPLA(1) synthesizes lysoGPCho metabolites with polyunsaturated fatty acids in vivo.
- TbPLA(1) is a serine hydrolase utilizing a Ser-His-Asp catalytic triad.
- Homozygous null TbPLA(1) mutants represent the first PLA(1) double knockouts in any organism.
Conclusions:
- TbPLA(1) represents a novel, evolutionarily distinct cytosolic PLA(1).
- The enzyme plays a role in synthesizing specific lysophospholipid metabolites in T. brucei.
- This work provides the first detailed characterization of a eukaryotic cytosolic PLA(1) and its unique evolutionary history.
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