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Atmospheric hydrogen consumption is regulated by glycerol-mediated catabolite repression in mycobacteria
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Atmospheric hydrogen consumption is regulated by glycerol-mediated catabolite repression in mycobacteria
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Journal Article
Atmospheric hydrogen consumption is regulated by glycerol-mediated catabolite repression in mycobacteria
2026
Overview
Soil microorganisms collectively consume 70 million tonnes of atmospheric hydrogen (H 2 ) a year, regulating atmospheric composition and climate change. In turn, consuming this dependable trace gas enables these microorganisms to survive even when their preferred organic energy sources are exhausted. Despite the importance of H 2 consumption for soil biodiversity and atmospheric regulation, the signals and sensors that regulate this process remain to be understood. Here, we demonstrate that a model soil bacterium turns on the machinery required for atmospheric H 2 consumption in direct response to being limited by organic carbon availability, through the process of catabolite repression. Specifically, in the absence of a sensor of the organic carbon source glycerol, a H 2 -consuming hydrogenase is highly expressed and active. These findings suggest that organic carbon levels have a major role in regulating trace gas oxidation, with implications for predicting how trace gas consumption and soil biodiversity respond to environmental change.
Publisher
American Society for Microbiology
Subject
/ Bacterial Proteins - genetics
/ Bacterial Proteins - metabolism
/ Gene Expression Regulation, Bacterial
/ Genetic Regulation of Hydrogen Metabolism
/ Hydrogenase Structure and Function
/ Microbial Physiology and Genetics
/ Mycobacterium smegmatis - genetics
/ Mycobacterium smegmatis - metabolism
/ Operon
/ Repressor Proteins - genetics
