Phylogenetic analysis of a novel sulfate-reducing magnetic bacterium, RS-1, demonstrates its membership of the δ-Proteobacteria

Ryuji Kawaguchi, J. Grant Burgess, Toshifumi Sakaguchi, Haruko Takeyama, Richard H. Thornhill, Tadashi Matsunaga

Research output: Contribution to journalArticle

51 Citations (Scopus)


Most of the 16S ribosomal RNA gene of a sulfate-reducing magnetic bacterium, RS-1, was sequenced, and phylogenetic analysis was carried out. The results suggest that RS-1 is a member of the δ-Proteobacteria, and it appears to represent a new genus. RS-1 is the first bacterium reported outside the α-Proteobacteria that contains magnetite inclusions. RS-1 therefore disrupts the correlation between the α-Proteobacteria and possession of magnetite inclusions, and that between the δ-Proteobacteria and possession of greigite inclusions. The existence of RS-1 also suggests that intracellular magnetite biomineralization is of multiple evolutionary origins.

Original languageEnglish
Pages (from-to)277-282
Number of pages6
JournalFEMS Microbiology Letters
Issue number3
Publication statusPublished - 1995 Mar 1



  • 16S ribosomal RNA
  • Bean-shaped magnetic inclusions
  • Evolution of magnetite biomineralization
  • Magnetic bacteria
  • RS-1
  • Sulfate-reducing magnetic bacteria
  • δ-Proteobacteria

ASJC Scopus subject areas

  • Microbiology
  • Molecular Biology
  • Genetics

Cite this