Formation of Filamentous Mn Oxide Particles by the Alphaproteobacterium Bosea sp. Strain BIWAKO-01

Seiko Furuta, Hisato Ikegaya, Hideki Hashimoto, Satoshi Ichise, Tetsuro Kohno, Naoyuki Miyata, Jun Takada

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


Mn-rich filamentous particles present in stratified water environments are considered bacteriogenic; however, little is known about their causative agents. This study investigated the production of these particles by an alphaproteobacterium, Bosea sp. strain BIWAKO-01. Particle formation was promoted in static cultures with slightly viscous medium at pH 6.0−6.3 under low-O2 conditions. The Mn(II) oxidation in cultures was slower in higher O2 concentration. These results suggested that pH and O2 concentration are important factors affecting filamentous Mn particle formation in the Mn(II) oxidizer. Lectin staining followed by fluorescence microscopy revealed the presence of specific carbohydrates in the filamentous structures. In addition, transmission electron microscopy, high angle annular dark field scanning transmission electron microscopy, and electron energy loss spectroscopy revealed the structural and spatial associations of Mn with O and C on a nanometer scale in filaments. The results suggested the occurrence of sheet-type Mn oxide likely due to the catalytic activity in exopolymeric substances including acidic polysaccharides.

Original languageEnglish
Pages (from-to)666-676
Number of pages11
JournalGeomicrobiology Journal
Issue number8
Publication statusPublished - Sept 14 2015


  • HAADF-STEM imaging and EELS mapping
  • Lake Biwa
  • Metallogenium
  • Mn(II)-oxidizing Bosea
  • biogenic Mn oxides

ASJC Scopus subject areas

  • Microbiology
  • Environmental Chemistry
  • General Environmental Science
  • Earth and Planetary Sciences (miscellaneous)


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