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Published on: February 15, 2012
Carbamyl phosphate synthesis in Bacillus subtilis
Biochemical Genetics
|February 1, 1975
Summary
Bacillus subtilis carbamyl phosphate synthetase (CPSase) is unstable and may have two forms. Its activity is regulated by various molecules, including uridine triphosphate and phosphoribosyl pyrophosphate (PRPP).
Area of Science:
- Biochemistry
- Molecular Biology
- Microbiology
Background:
- Carbamyl phosphate synthetase (CPSase) is a key enzyme in pyrimidine biosynthesis.
- Understanding CPSase regulation is crucial for bacterial metabolic studies.
Purpose of the Study:
- To characterize carbamyl phosphate synthetase (CPSase) activity in pyrimidine-requiring Bacillus subtilis mutants.
- To investigate the potential presence and regulation of multiple CPSase forms in B. subtilis.
Main Methods:
- Development of in vitro and in situ assays for CPSase activity.
- Enzymatic assays using B. subtilis mutants.
- Enzyme extraction and stability studies.
Main Results:
- CPSase is highly unstable, requiring glycerol and dithiothreitol for extraction.
- Enzyme activity is rapidly lost upon sonication or lysozyme treatment.
- Genetic data suggest B. subtilis may possess two CPSases.
- CPSase activity is inhibited by uridine triphosphate and dihydroorotate.
- Activation of CPSase by phosphoribosyl pyrophosphate (PRPP) and ornithine was observed.
Conclusions:
- B. subtilis CPSase is sensitive to extraction and assay conditions.
- Evidence supports the existence of multiple CPSase forms in B. subtilis.
- CPSase activity is subject to complex allosteric regulation by pyrimidine pathway intermediates and precursors.
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