2-Aminoethylphosphonate utilization in Pseudomonas putida BIRD-1 is controlled by multiple master regulators
Andrew R J Murphy1, David J Scanlan1, Yin Chen1
1School of Life Sciences, University of Warwick, Gibbet Hill Road, Coventry, UK.
Environmental Microbiology
|March 1, 2022
Summary
Bacteria utilize 2-aminoethylphosphonate (2AEP) for nutrients under dual regulation. Nutrient limitation triggers utilization, while 2AEP presence ensures full gene expression, revealing coordinated nutrient stress and phosphonate metabolism.
Area of Science:
- Microbiology
- Molecular Biology
- Biochemistry
Background:
- Bacteria employ regulatory systems like CbrAB, NtrBC, and PhoBR to manage nutrient limitations (carbon, nitrogen, phosphorus).
- Phosphonates, like 2-aminoethylphosphonate (2AEP), are organophosphorus compounds utilized by many pseudomonads for C, N, or P.
- Previous studies indicated PhoBR's role in 2AEP utilization, with its use as a C/N source being substrate-inducible.
Purpose of the Study:
- To investigate the regulatory mechanisms governing 2-aminoethylphosphonate (2AEP) utilization in Pseudomonas putida BIRD-1.
- To elucidate the dual regulation of 2AEP metabolism involving nutrient limitation and substrate presence.
- To identify the specific regulators coordinating global stress responses with phosphonate metabolism.
Main Methods:
- Utilized Pseudomonas putida BIRD-1, a plant-growth-promoting rhizobacterium.
- Investigated gene expression under conditions of nutrient (C, N, P) depletion and 2AEP presence.
- Performed mutational analysis of the LysR-type regulator AepR and its effect on the PhnWX system.
Main Results:
- 2AEP utilization in P. putida BIRD-1 is under dual regulation, activated by C, N, or P limitation (via CbrAB, NtrBC, PhoBR) and requiring 2AEP presence for full gene expression.
- AepR, a LysR-type regulator, plays a crucial role in this dual regulatory mechanism, confirming coordination between stress response and specific substrate metabolism.
- This study demonstrates the first identified interplay between global stress regulators and specific phosphonate metabolism regulators.
Conclusions:
- 2AEP utilization is tightly controlled, responding to both environmental nutrient availability and the presence of the substrate itself.
- The coordinated action of global nutrient regulators (CbrAB, NtrBC, PhoBR) and specific regulators (AepR) optimizes phosphonate metabolism in bacteria.
- This finding provides novel insights into bacterial adaptation strategies for nutrient acquisition from diverse environmental sources.
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