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Article Abstract
For microbes and their hosts, sensing of external cues is essential for their survival. For example, in the case of plant associated microbes, the light absorbing pigment composition of the plant as well as the ambient light conditions determine the well-being of the microbe. In addition to light sensing, some microbes can utilize xanthorhodopsin based proton pumps and bacterial photosynthetic complexes that work in parallel for energy production. They are called dual phototrophic systems. Light sensing requirements in these type of systems are obviously demanding. In nature, the photosensing machinery follows mainly the same composition in all organisms. However, the specific role of each photosensor in specific light conditions is elusive. In this study, we provide an overall picture of photosensors present in dual phototrophic systems. We compare the genomes of the photosensor proteins from dual phototrophs to those from similar microbes with "single" phototrophicity or microbes without phototrophicity. We find that the dual phototrophic bacteria obtain a larger variety of photosensors than their light inactive counterparts. Their rich domain composition and functional repertoire remains similar across all microbial photosensors. Our study calls further investigations of this particular group of bacteria. This includes protein specific biophysical characterization in vitro, microbiological studies, as well as clarification of the ecological meaning of their host microbial interactions.
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| http://dx.doi.org/10.1016/j.jmb.2023.168412 | DOI Listing |
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Article Synopsis
- Microbes rely on sensing external cues, especially light conditions, for survival, particularly in plant-associated environments where light absorption affects microbial well-being.
- Some microbes utilize advanced systems, like xanthorhodopsin-based proton pumps, allowing them to harness energy from light, known as dual phototrophic systems.
- This study analyzes the genomes of photosensor proteins in dual phototrophic bacteria, revealing they possess a greater variety of photosensors compared to microbes that are less or non-photosynthetic, highlighting the need for more research into their ecological interactions and functions.
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