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Published on: July 21, 2014
Environmental control of phosphorylation pathways in a branched two-component system
Maria Luisa López-Redondo1, Felix Moronta, Paloma Salinas
1Instituto de Biomedicina de Valencia (CSIC), 46010 Valencia, Spain.
Molecular Microbiology
|October 28, 2010
Summary
NblS histidine kinase in cyanobacteria regulates photosynthesis by interacting with RpaB and SrrA response regulators. This study reveals complex regulatory interactions in a branched two-component system, crucial for environmental acclimatization.
Area of Science:
- Microbiology
- Molecular Biology
- Biochemistry
Background:
- NblS is a highly conserved histidine kinase in cyanobacteria.
- It plays a vital role in regulating photosynthesis and adapting to environmental changes.
- Understanding its regulatory network is key to comprehending cyanobacterial physiology.
Purpose of the Study:
- To identify the response regulators of NblS.
- To characterize the interactions within the NblS signaling system.
- To elucidate the regulatory mechanisms governing photosynthesis and environmental acclimatization in cyanobacteria.
Main Methods:
- In silico analysis
- In vivo genetic studies in Synechococcus elongatus PCC 7942
- In vitro phosphorylation assays
Main Results:
- RpaB and SrrA were identified as cognate response regulators of NblS.
- NblS shows a preference for phosphorylating SrrA in vitro, but the NblS-RpaB pathway is essential for viability.
- RpaB represses srrA expression under low light, while high light induces srrA and subsequent negative regulation, indicating pathway cooperation.
Conclusions:
- A complex regulatory network involving NblS, RpaB, and SrrA has been elucidated.
- This branched two-component system provides a paradigm for response regulator interactions.
- The findings offer insights into cyanobacterial adaptation mechanisms to varying light conditions.
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