AI Article Synopsis
- The study investigates how the bacterium S. maltophilia resists and detoxifies arsenic, despite the overall limited understanding in this area.
- Advanced analytical techniques revealed that S. maltophilia shows minimal changes on its cell surface when exposed to arsenic, but it does accumulate arsenic internally.
- The research found that S. maltophilia activates various protective enzymes and possesses specific genes that facilitate arsenic reduction and detoxification, highlighting a complex molecular mechanism for bioremediation.
Article Abstract
The mechanism of arsenic resistance in bacteria is under studied and still lacks a clear understanding despite of wide research work. The advanced technologies can help in analysing the arsenic bioremediating bacteria at a molecular level. With this line of idea, highly efficient arsenic bioremediating S. maltophilia was subjected to extensive analysis to understand the mechanism of arsenic resistance and bioremediation. The cell surface analysis revealed that S. maltophilia induces only slight changes in cell surface in the presence of arsenic. Whereas, TEM analysis has indicated the bioaccumulation of arsenic in S. maltophilia. Also, arsenic was found to generate ROS in a concentration dependant manner, and in response, S. maltophilia activated SOD, catalase, thioredoxin reductase etc. to manage oxidative stress which is very much crucial in managing arsenic toxicity. S. maltophilia was found to possess genes such as arsC, aoxB, aoxC and aioA. These genes are involved in arsenic reduction and oxidation. Transcriptomics and proteomics analysis have shown that S. maltophilia detoxifies arsenic by upregulating ars operon, arsH, BetB etc. which are responsible for arsenic reduction, efflux methylation, oxidation etc. A detailed molecular mechanism of arsenic bioremediation in S. maltophilia was put forth.
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| http://dx.doi.org/10.1016/j.envpol.2024.125066 | DOI Listing |
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