Insights into the genome of large sulfur bacteria revealed by analysis of single filaments

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

  • Marc Mussmann, Denmark
  • Fen Z. Hu, Denmark
  • Michael Richter, Denmark
  • Dirk de Beer, Denmark
  • André Preisler, Denmark
  • Bo Barker Jørgensen
  • Marcel Huntemann, Denmark
  • Frank Oliver Glöckner, Denmark
  • Rudolf Amann, Denmark
  • Werner J.H. Koopman, Denmark
  • Roger S. Lasken, Denmark
  • Benjamin Janto, Denmark
  • Justin Hogg, Denmark
  • Paul Stoodley, Denmark
  • Robert Boissy, Denmark
  • Garth D. Ehrlich, Denmark
  • Department of Biological Sciences, Microbiology
  • Center for Geomicrobiology
Marine sediments are frequently covered by mats of the filamentous Beggiatoa and other large nitrate-storing bacteria that oxidize hydrogen sulfide using either oxygen or nitrate, which they store in intracellular vacuoles. Despite their conspicuous metabolic properties and their biogeochemical importance, little is known about their genetic repertoire because of the lack of pure cultures. Here, we present a unique approach to access the genome of single filaments of Beggiatoa by combining whole genome amplification, pyrosequencing, and optical genome mapping. Sequence assemblies were incomplete and yielded average contig sizes of approximately 1 kb. Pathways for sulfur oxidation, nitrate and oxygen respiration, and CO2 fixation confirm the chemolithoautotrophic physiology of Beggiatoa. In addition, Beggiatoa potentially utilize inorganic sulfur compounds and dimethyl sulfoxide as electron acceptors. We propose a mechanism of vacuolar nitrate accumulation that is linked to proton translocation by vacuolar-type ATPases. Comparative genomics indicates substantial horizontal gene transfer of storage, metabolic, and gliding capabilities between Beggiatoa and cyanobacteria. These capabilities enable Beggiatoa to overcome non-overlapping availabilities of electron donors and acceptors while gliding between oxic and sulfidic zones. The first look into the genome of these filamentous sulfur-oxidizing bacteria substantially deepens the understanding of their evolution and their contribution to sulfur and nitrogen cycling in marine sediments.
Original languageEnglish
JournalP L o S Biology
Volume5
Issue9
Pages (from-to)1923
ISSN1544-9173
DOIs
Publication statusPublished - 2007

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