Silica deposition and phenotypic changes to Thermus thermophilus cultivated in the presence of supersaturated silicia

Satoru Iwai, Katsumi Doi, Yasuhiro Fujino, Takeo Nakazono, Kosai Fukuda, Yoshinobu Motomura, Seiya Ogata

研究成果: ジャーナルへの寄稿記事

13 引用 (Scopus)

抄録

Thermus thermophilus cells formed siliceous deposits in the presence of supersaturated silicic acid (600 p.p.m SiO2). The supersaturated silicic acid promoted interaction between cells and the inside walls of glass culture bottles, leading to the development of cell aggregates or biofilms. Electron probe microanalysis showed that within the aggregates most of the cell surfaces were covered with silica. Under these conditions, there was remarkable production of silica-induced protein (Sip), a solute-binding component of the Fe3+ -binding ABC transporter. Furthermore, supersaturated silica enhanced resistance to the peptide antibiotics bacitracin, colistin and polymyxin B, which all act on the cell envelope. By contrast, supersaturated silica did not induce resistance to ampicillin, chloramphenicol, kanamycin and tetracycline, which inhibit peptide synthesis. Although strong expression of Sip was detected in liquid cultures of T. thermophilus in the presence of supersaturated silica and colistin, upregulated transcription of putative efflux pump and multidrug resistance ABC transporter genes were not detected by quantitative real-time PCR analysis. These findings suggest Sip promotes silica deposition on the surfaces of cells, after which the silicified outer membrane may serve as a suit-of-armor, conferring resistance to peptide antibiotics.

元の言語英語
ページ(範囲)809-816
ページ数8
ジャーナルISME Journal
4
発行部数6
DOI
出版物ステータス出版済み - 6 1 2010

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Thermus thermophilus
Silicon Dioxide
silica
peptide antibiotics
Silicic Acid
peptide
colistin
Colistin
silicic acid
ABC transporters
ATP-Binding Cassette Transporters
cell aggregates
antibiotics
Peptides
protein
cells
siliceous deposit
Anti-Bacterial Agents
Ampicillin Resistance
polymyxin B

All Science Journal Classification (ASJC) codes

  • Microbiology
  • Ecology, Evolution, Behavior and Systematics

これを引用

Silica deposition and phenotypic changes to Thermus thermophilus cultivated in the presence of supersaturated silicia. / Iwai, Satoru; Doi, Katsumi; Fujino, Yasuhiro; Nakazono, Takeo; Fukuda, Kosai; Motomura, Yoshinobu; Ogata, Seiya.

:: ISME Journal, 巻 4, 番号 6, 01.06.2010, p. 809-816.

研究成果: ジャーナルへの寄稿記事

Iwai, Satoru ; Doi, Katsumi ; Fujino, Yasuhiro ; Nakazono, Takeo ; Fukuda, Kosai ; Motomura, Yoshinobu ; Ogata, Seiya. / Silica deposition and phenotypic changes to Thermus thermophilus cultivated in the presence of supersaturated silicia. :: ISME Journal. 2010 ; 巻 4, 番号 6. pp. 809-816.
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abstract = "Thermus thermophilus cells formed siliceous deposits in the presence of supersaturated silicic acid (600 p.p.m SiO2). The supersaturated silicic acid promoted interaction between cells and the inside walls of glass culture bottles, leading to the development of cell aggregates or biofilms. Electron probe microanalysis showed that within the aggregates most of the cell surfaces were covered with silica. Under these conditions, there was remarkable production of silica-induced protein (Sip), a solute-binding component of the Fe3+ -binding ABC transporter. Furthermore, supersaturated silica enhanced resistance to the peptide antibiotics bacitracin, colistin and polymyxin B, which all act on the cell envelope. By contrast, supersaturated silica did not induce resistance to ampicillin, chloramphenicol, kanamycin and tetracycline, which inhibit peptide synthesis. Although strong expression of Sip was detected in liquid cultures of T. thermophilus in the presence of supersaturated silica and colistin, upregulated transcription of putative efflux pump and multidrug resistance ABC transporter genes were not detected by quantitative real-time PCR analysis. These findings suggest Sip promotes silica deposition on the surfaces of cells, after which the silicified outer membrane may serve as a suit-of-armor, conferring resistance to peptide antibiotics.",
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