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StatusReference proteome
Gene counti - Download one protein sequence per gene (FASTA)
Proteome IDiUP000000663
Taxonomy351160 - Methanocella arvoryzae (strain DSM 22066 / NBRC 105507 / MRE50)
StrainDSM 22066 / NBRC 105507 / MRE50
Last modifiedJuly 29, 2018
Genome assembly and annotationi GCA_000063445.1 from ENA/EMBL

A large part of the emitted methane is produced by methanogenic archaea and released through the gas vascular system of the rice plant. Rice Cluster I (RC-I) methanogens in the rice rhizosphere were found to play the key role in methane production from plant-derived carbon. They were identified as the predominant methanogens in rice paddy soils of geographically diverse regions. Several attempts have been made to isolate RC-I representatives in pure culture. Although isolation failed, one of these attempts with rice paddy soil as the inoculum resulted in the methanogenic consortium MRE50, in which RC-I methanogens constituted the only archaeal components. The complete genome sequence of a single RC-I representative was unambiguously reconstructed. The genome of the Uncultured methanogenic archaeon RC-I is made up of a single circular chromosome of 3,179,916 base pairs with 3103 coding sequences. The central energy metabolism of RC-I is H2/CO2-dependent methanogenesis. It can use formate and formaldehyde for methanogenic growth. It encodes only an incomplete methanol-coenzyme M methyltransferase system. It appears to use the Embden-Meyerhof-Parnas pathway for carbohydrate metabolism, thus involving bacterial-type enzymes not yet identified in archaea. The biosynthetic pathways for all amino acids except glutamate appear to be complete. Two mechanisms for nitrogen acquisition exist besides glutamate uptake: ammonium assimilation (glutamine synthetase, glutamate synthase and glutamate dehydrogenase) and dinitrogen fixation (nitrogenase). Sulfur assimilation is predicted to occur thanks to the reduction of sulfate to sulfide.


Component nameGenome Accession(s)


  1. "Genome of rice cluster I archaea -- the key methane producers in the rice rhizosphere."
    Erkel C., Kube M., Reinhardt R., Liesack W.
    Science 2006:370-372(2006) [PubMed] [Europe PMC] [Abstract]
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