Discovery and Complete Genome Sequence of a Bacteriophage from an Obligate Intracellular Symbiont of a Cellulolytic Protist in the Termite Gut

DOI Web Site Web Site PubMed 被引用文献8件 参考文献42件 オープンアクセス
  • Pramono Ajeng K.
    Department of Biological Sciences, Tokyo Institute of Technology
  • Kuwahara Hirokazu
    Department of Biological Sciences, Tokyo Institute of Technology
  • Itoh Takehiko
    Department of Biological Information, Tokyo Institute of Technology
  • Toyoda Atsushi
    National Institute of Genetics
  • Yamada Akinori
    Department of Biological Sciences, Tokyo Institute of Technology Division of Marine Biomaterial Science, Graduate School of Fisheries Science and Environmental Studies, Nagasaki University
  • Hongoh Yuichi
    Department of Biological Sciences, Tokyo Institute of Technology

書誌事項

公開日
2017
資源種別
journal article
DOI
  • 10.1264/jsme2.me16175
公開者
日本微生物生態学会 / 日本土壌微生物学会 / Taiwan Society of Microbial Ecology / 植物微生物研究会 / 極限環境生物学会

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説明

<p>Termites depend nutritionally on their gut microbes, and protistan, bacterial, and archaeal gut communities have been extensively studied. However, limited information is available on viruses in the termite gut. We herein report the complete genome sequence (99,517 bp) of a phage obtained during a genome analysis of “Candidatus Azobacteroides pseudotrichonymphae” phylotype ProJPt-1, which is an obligate intracellular symbiont of the cellulolytic protist Pseudotrichonympha sp. in the gut of the termite Prorhinotermes japonicus. The genome of the phage, designated ProJPt-Bp1, was circular or circularly permuted, and was not integrated into the two circular chromosomes or five circular plasmids composing the host ProJPt-1 genome. The phage was putatively affiliated with the order Caudovirales based on sequence similarities with several phage-related genes; however, most of the 52 protein-coding sequences had no significant homology to sequences in the databases. The phage genome contained a tRNA-Gln (CAG) gene, which showed the highest sequence similarity to the tRNA-Gln (CAA) gene of the host “Ca. A. pseudotrichonymphae” phylotype ProJPt-1. Since the host genome lacked a tRNA-Gln (CAG) gene, the phage tRNA gene may compensate for differences in codon usage bias between the phage and host genomes. The phage genome also contained a non-coding region with high nucleotide sequence similarity to a region in one of the host plasmids. No other phage-related sequences were found in the host ProJPt-1 genome. To the best of our knowledge, this is the first report of a phage from an obligate, mutualistic endosymbiont permanently associated with eukaryotic cells.</p>

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