Complete genome sequence of the facultative anaerobic magnetotactic bacterium Magnetospirillum sp. strain AMB-1

Tadashi Matsunaga*, Yoshiko Okamura, Yorikane Fukuda, Aris Tri Wahyudi, Yaeko Murase, Haruko Takeyama

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

181 Citations (Scopus)


Magnetospirillum sp. strain AMB-1 is a Gram-negative α- proteobacterium that synthesizes nano-sized magnetites, referred to as magnetosomes, aligned intracellularly in a chain. The potential of this nano-sized material is growing and will be applicable to broad research areas. It has been expected that genome analysis would elucidate the mechanism of magnetosome formation by magnetic bacteria. Here we describe the genome of Magnetospirillum sp. AMB-1 wild type, which consists of a single circular chromosome of 4 967 148 bp. For identification of genes required for magnetosome formation, transposon rnutagenesis and determination of magnetosome membrane proteins were performed. Analysis of a non-magnetic transposon mutant library focused on three unknown genes from 2752 unknown genes and three genes from 205 signal transduction genes. Partial proteome analysis of the magnetosome membrane revealed that the membrane contains numerous oxidation/reduction proteins and a signal response regulator that may function in magnetotaxis. Thus, oxidation/reduction proteins and elaborate multidomain signaling proteins were analyzed. This comprehensive genome analysis will enable resolution of the mechanisms of magnetosome formation and provide a template to determine how magnetic bacteria maintain a species-specific, nano-sized, magnetic single domain and paramagnetic morphology.

Original languageEnglish
Pages (from-to)157-166
Number of pages10
JournalDNA Research
Issue number3
Publication statusPublished - 2005
Externally publishedYes


  • Biomineralization
  • Magnetosome
  • Magnetotactic bacteria

ASJC Scopus subject areas

  • Molecular Biology
  • Genetics


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