Arsenic resistance and removal by marine and non-marine bacteria

Mio Takeuchi, Hodaka Kawahata, Lallan Prasad Gupta, Noriko Kita, Yuichi Morishita, Yoshiro Ono, Takeshi Komai

Research output: Contribution to journalArticlepeer-review

87 Citations (Scopus)

Abstract

Arsenic resistance and removal was evaluated in nine bacterial strains of marine and non-marine origins. Of the strains tested, Marinomonas communis exhibited the second-highest arsenic resistance with median effective concentration (EC50) value of 510 mg As l-1, and was capable of removing arsenic from culture medium amended with arsenate. Arsenic accumulation in cells amounted to 2290 μg As g-1 (dry weight) when incubated on medium containing 5 mg As l-1 of arsenate. More than half of the arsenic removed was related to metabolic activity: 45% of the arsenic was incorporated into the cytosol fraction and 10% was found in the lipid-bound fraction of the membrane, with the remaining arsenic considered to be adsorbed onto the cell surface. Potential arsenic resistance and removal were also examined in six marine and non-marine environmental water samples. Of the total bacterial colony counts, 28-100% of bacteria showed arsenic resistance. Some of the bacterial consortia, especially those from seawater enriched with arsenate, exhibited higher accumulated levels of arsenic than M. communis under the same condition. These results showed that arsenic resistant and/or accumulating bacteria are widespread in the aquatic environment, and that arsenic-accumulating bacteria such as M. communis are potential candidates for bioremediation of arsenic contaminated water.

Original languageEnglish
Pages (from-to)434-442
Number of pages9
JournalJournal of Biotechnology
Volume127
Issue number3
DOIs
Publication statusPublished - 2007 Jan 10
Externally publishedYes

Keywords

  • Accumulation
  • Arsenic
  • Bacteria
  • Bioremediation
  • Removal
  • Resistance

ASJC Scopus subject areas

  • Biotechnology
  • Bioengineering
  • Applied Microbiology and Biotechnology

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