Simultaneously discrete biomineralization of magnetite and tellurium nanocrystals in magnetotactic bacteria

Masayoshi Tanaka, Atsushi Arakaki, Sarah S. Staniland, Tadashi Matsunaga*


研究成果: Article査読

38 被引用数 (Scopus)


Magnetotactic bacteria synthesize intracellular magnetosomes comprising membrane-enveloped magnetite crystals within the cell which can be manipulated by a magnetic field. Here, we report the first example of tellurium uptake and crystallization within a magnetotactic bacterial strain, Magnetospirillum magneticum AMB-1. These bacteria independently crystallize tellurium and magnetite within the cell. This is also highly significant as tellurite (TeO3 2-), an oxyanion of tellurium, is harmful to both prokaryotes and eukaryotes. Additionally, due to its increasing use in high-technology products, tellurium is very precious and commercially desirable. The use of microorganisms to recover such molecules from polluted water has been considered as a promising bioremediation technique. However, cell recovery is a bottleneck in the development of this approach. Recently, using the magnetic property of magnetotactic bacteria and a cell surface modification technology, the magnetic recovery of Cd2+ adsorbed onto the cell surface was reported. Crystallization within the cell enables approximately 70 times more bioaccumulation of the pollutant per cell than cell surface adsorption, while utilizing successful recovery with a magnetic field. This fascinating dual crystallization of magnetite and tellurium by magnetotactic bacteria presents an ideal system for both bioremediation and magnetic recovery of tellurite.

ジャーナルApplied and Environmental Microbiology
出版ステータスPublished - 2010 8月

ASJC Scopus subject areas

  • 応用微生物学とバイオテクノロジー
  • 食品科学
  • バイオテクノロジー
  • 生態学
  • 医学(全般)


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