Atmospheric hydrogen scavenging: from enzymes to ecosystems
| Autor: | Matthew C. Taylor, Michael Berney, Ralf Conrad, Chris Greening, Robyn J. Russell, Gregory M. Cook, Kiel Hards, Philippe Constant, John G. Oakeshott, Sergio E. Morales |
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| Přispěvatelé: | University of Otago [Dunedin, Nouvelle-Zélande], CSIRO - Land & Water National Research Flagship, Institut Armand Frappier (INRS-IAF), Institut National de la Recherche Scientifique [Québec] (INRS)-Réseau International des Instituts Pasteur (RIIP), Albert Einstein College of Medicine [New York], Max Planck Institute for Terrestrial Microbiology, Max-Planck-Gesellschaft, University of Auckland [Auckland] |
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Hydrogenase
Hydrogen [SDV]Life Sciences [q-bio] Respiratory chain Air Microbiology chemistry.chemical_element Hydrogen cycle Biology Applied Microbiology and Biotechnology Oxygen Catalysis 03 medical and health sciences [SDV.EE.ECO]Life Sciences [q-bio]/Ecology environment/Ecosystems Microbial ecology Bacterial Proteins MESH: Air Microbiology MESH: Ecosystem Scavenging MESH: Bacterial Proteins Ecosystem 030304 developmental biology 2. Zero hunger 0303 health sciences Ecology 030306 microbiology Atmosphere MESH: Hydrogen Actinobacteria chemistry Biochemistry 13. Climate action MESH: Hydrogenase Environmental chemistry Minireview MESH: Atmosphere Food Science Biotechnology MESH: Actinobacteria |
| Zdroj: | Applied and Environmental Microbiology Applied and Environmental Microbiology, American Society for Microbiology, 2015, 81 (4), pp.1190-9. ⟨10.1128/AEM.03364-14⟩ |
| ISSN: | 0099-2240 1098-5336 |
| DOI: | 10.1128/AEM.03364-14⟩ |
| Popis: | We have known for 40 years that soils can consume the trace amounts of molecular hydrogen (H 2 ) found in the Earth's atmosphere. This process is predicted to be the most significant term in the global hydrogen cycle. However, the organisms and enzymes responsible for this process were only recently identified. Pure culture experiments demonstrated that several species of Actinobacteria , including streptomycetes and mycobacteria, can couple the oxidation of atmospheric H 2 to the reduction of ambient O 2 . A combination of genetic, biochemical, and phenotypic studies suggest that these organisms primarily use this fuel source to sustain electron input into the respiratory chain during energy starvation. This process is mediated by a specialized enzyme, the group 5 [NiFe]-hydrogenase, which is unusual for its high affinity, oxygen insensitivity, and thermostability. Atmospheric hydrogen scavenging is a particularly dependable mode of energy generation, given both the ubiquity of the substrate and the stress tolerance of its catalyst. This minireview summarizes the recent progress in understanding how and why certain organisms scavenge atmospheric H 2 . In addition, it provides insight into the wider significance of hydrogen scavenging in global H 2 cycling and soil microbial ecology. |
| Databáze: | OpenAIRE |
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