Production of peritrichate bacterionanofibers and their proteinaceous components by Acinetobacter sp. Tol 5 cells affected by growth substrates(MICROBIAL PHYSIOLOGY AND BIOTECHNOLOGY)
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概要
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The toluene-degrading bacterium Acinetobacter sp. Tol 5 is highly adhesive through cell-surface nanofibers. Previously, we identified two morphologically distinct nanofibers on Tol 5 cells, namely, nonperitrichate anchor-like and peritrichate pilus-like nanofibers. In the present study, the application of improved electron microscopy techniques enabled discrimination of three distinct types of peritrichate nanofibers on Tol 5 cells. Interestingly, production of these nanofibers was affected by the available growth substrate. Thick, long, straight nanofibers a, which were present on cells grown on toluene, lactate, and ethanol, were not observed on cells grown on triacylglycerol (TAG). In contrast, cells grown on TAG were covered with long, curved nanofibers c, which only existed sparsely on cells grown on toluene, lactate, and ethanol. Thin, short, straight nanofibers b were found densely covering the margin of cells grown on all four growth substrates. SDS-PAGE of Tol 5 cell-surface proteins detected a protein of 17.5kDa that was expressed at a high level on ethanol, but was undetectable on TAG. Conversely, a 26kDa protein was identified that was exclusively expressed on TAG, but was only faintly expressed by cells grown on the other substrates. Based on N-terminal amino acid sequences, the 17.5 and 26kDa proteins were identified as the major subunits of type 1 and Fil pili, respectively, which are typical bacterionanofibers. From these results, we deduced that nanofibers a and c are type 1 and Fil pili, respectively. The adhesiveness of Tol 5 cells was low only when they were grown on TAG.
著者
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Ishikawa Yu
Department Of Internal Medicine Ii And Memorial Heart Center Iwate Medical University School Of Medi
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Hori Katsutoshi
Dep. Of Materials Sci. And Engineering Nagoya Inst. Of Technol. Gokiso-cho Showa-ku Nagoya 466-8555
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Hori Katsutoshi
Department Of Materials Science And Engineering Nagoya Institute Of Technology:project Research Cent
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Hori Katsutoshi
Graduate School Of Bioscience And Biotechnology Tokyo Institute Of Technology:department Of Material
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Ishikawa Yu
Nagoya Institute Of Technology
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Ebi Hironori
Department Of Materials Science And Engineering Nagoya Institute Of Technology
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Ishikawa Masahito
Department of Materials Science and Engineering, Nagoya Institute of Technology
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Yamada Mariko
Department of Materials Science and Engineering, Nagoya Institute of Technology
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Higuchi Aisuke
Department of Materials Science and Engineering, Nagoya Institute of Technology
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Higuchi Aisuke
Department Of Materials Science And Engineering Nagoya Institute Of Technology
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Ishikawa Masahito
Department Of Materials Science And Engineering Nagoya Institute Of Technology
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Ishikawa Masahito
Department Of Electrical Engineering Faculty Of Engineering The Technological University Of Nagaoka
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Yamada Mariko
Department Of Materials Science And Engineering Nagoya Institute Of Technology
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Ishikawa Masahito
Department Of Biotechnology Graduate School Of Engineering Nagoya University
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Hori Katsutoshi
Department Of Biotechnology Graduate School Of Engineering Nagoya University
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