Arginine Biosynthesis Regulation in Escherichia coli
Summary
Arginine biosynthesis in Escherichia coli proceeds through a seven-step pathway converting glutamate to arginine via the key intermediate carbamoyl phosphate. This route is subject to multilayered regulation to balance cellular demand, conserve resources and prevent accumulation of toxic intermediates. At its core sits the arginine repressor ArgR, which senses intracellular arginine levels and modulates transcription of arginine biosynthetic operons. Carbamoyl phosphate synthetase (CPSase), encoded by the carAB operon, occupies a metabolic crossroads shared with pyrimidine biosynthesis and is controlled both transcriptionally and allosterically. Allosteric effectors from arginine, pyrimidine and purine pathways bind to distinct sites on CPSase, fine-tuning its catalytic output in response to metabolite flux. Transcription of carAB is further refined by nucleoid-associated proteins, tandem promoter arrangements, reiterative transcription initiation and the stringent response alarmone ppGpp, enabling rapid adaptation to nutrient status and environmental stress. Structural insights reveal that enzyme oligomerisation and internal tunnelling protect the labile carbamoyl phosphate, directing it efficiently between enzyme partners. This integrated regulatory network underpins bacterial adaptability, informs antimicrobial target discovery and supports metabolic engineering efforts to produce arginine and its derivatives.
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Arginine Biosynthesis Regulation in Escherichia coli publication trend
The graph below shows the total number of articles in arginine biosynthesis regulation in escherichia coli across all publications each year (not limited to Nature Index journals).
Technical terms
Arginine repressor (ArgR): A hexameric transcription factor that binds arginine and controls expression of arginine biosynthesis genes.
carAB operon: The gene cluster encoding the two subunits of carbamoyl phosphate synthetase, pivotal to arginine and pyrimidine synthesis.
Allosteric regulation: Modulation of enzyme activity through binding of effectors at sites distinct from the catalytic centre.
Metabolic channeling: Direct transfer of an intermediate between successive enzymes, reducing its diffusion and degradation.
Nucleoid-associated proteins (NAPs): DNA-binding proteins that shape chromosomal architecture and influence gene transcription.
Reiterative transcription initiation: A process in which RNA polymerase adds non-templated nucleotides at the start site, affecting transcript abundance and composition.
Stringent response: A global regulatory mechanism mediated by the alarmone ppGpp, adjusting transcription and metabolism during nutrient stress.
References
- Regulation of carbamoylphosphate synthesis in Escherichia coli: an amazing metabolite at the crossroad of arginine and pyrimidine biosynthesis. Amino Acids (2018).
- Sources and Fates of Carbamyl Phosphate: A Labile Energy-Rich Molecule with Multiple Facets. Biology (2018).
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