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Two-component system CbrA/CbrB controls alginate production in Azotobacter vinelandii
Elva Quiroz-Rocha1, Fernando Bonilla-Badía1,2, Valentina García-Aguilar3
1Departamento de Microbiología Molecular, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Av. Universidad 2001, Col Chamilpa, Cuernavaca, Morelos, CP 62210, México.
Microbiology (Reading, England)
|July 13, 2017
Summary
The CbrA/CbrB system in Azotobacter vinelandii negatively regulates alginate synthesis by controlling RsmA expression. This two-component system is crucial for adapting to environmental changes and impacts bacterial polymer production.
Area of Science:
- Microbiology
- Bacterial Physiology
- Gene Regulation
Background:
- Azotobacter vinelandii produces alginate, a bacterial polymer, regulated by the Gac/Rsm system.
- The RsmA protein inhibits alginate biosynthesis gene (algD) translation.
- The CbrA/CbrB two-component system regulates adaptation in Pseudomonas species.
Purpose of the Study:
- To investigate the role of the CbrA/CbrB two-component system in Azotobacter vinelandii alginate synthesis.
- To elucidate the regulatory mechanisms by which CbrA/CbrB influences alginate production.
Main Methods:
- Gene expression analysis of alginate biosynthetic genes.
- Assessing the impact of CbrA/CbrB system mutations on alginate production.
- Investigating the role of RpoS and rsmA in CbrA/CbrB-mediated regulation.
Main Results:
- The CbrA/CbrB system negatively affects alginate synthesis in A. vinelandii.
- CbrA/CbrB controls algD translation and is necessary for optimal rsmA expression.
- CbrA/CbrB is required for RpoS accumulation, which positively impacts rsmA transcription.
Conclusions:
- The CbrA/CbrB system plays a novel negative regulatory role in alginate synthesis in A. vinelandii.
- This system influences alginate production through RsmA and RpoS, indicating a central role in carbon metabolism regulation.
