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Genome of Rice Cluster I Archaea--the Key Methane Producers in the Rice Rhizosphere
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Genome of Rice Cluster I Archaea--the Key Methane Producers in the Rice Rhizosphere
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Journal Article
Genome of Rice Cluster I Archaea--the Key Methane Producers in the Rice Rhizosphere
2006
Overview
Rice fields are a global source of the greenhouse gas methane, which is produced by methanogenic archaea, and by methanogens of Rice Cluster I (RC-I) in particular. RC-I methanogens are not yet available in pure culture, and the mechanistic reasons for their prevalence in rice fields are unknown. We reconstructed a complete RC-I genome (3.18 megabases) using a metagenomic approach. Sequence analysis demonstrated an aerotolerant, H₂/CO₂-dependent lifestyle and enzymatic capacities for carbohydrate metabolism and assimilatory sulfate reduction, hitherto unknown among methanogens. These capacities and a unique set of antioxidant enzymes and DNA repair mechanisms as well as oxygen-insensitive enzymes provide RC-I with a selective advantage over other methanogens in its habitats, thereby explaining the prevalence of RC-I methanogens in the rice rhizosphere.
Publisher
American Association for the Advancement of Science,The American Association for the Advancement of Science
Subject
/ Archaea
/ Biological and medical sciences
/ Enzymes
/ Euryarchaeota - classification
/ Fundamental and applied biological sciences. Psychology
/ genes
/ Genetics
/ genome
/ Genomes
/ Genomics
/ Methane
/ Methanomicrobiales - classification
/ Methanomicrobiales - genetics
/ Methanomicrobiales - metabolism
/ Methanomicrobiales - physiology
/ Methanosarcinales - classification
/ Methanosarcinales - genetics
/ Methanosarcinales - metabolism
/ Methanosarcinales - physiology
/ Rice
