Cytochrome c and Bioenergetic Hypothetical Model for Alkaliphilic Bacillus spp.

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概要

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• Although a bioenergetic parameter is unfavorable for production of ATP (ΔpH<0), the growth rate and yield of alkaliphilic Bacillus strains are higher than those of neutralophilic Bacillus subtilis. This finding suggests that alkaliphiles possess a unique energy-producing machinery taking advantage of the alkaline environment. Expected bioenergetic parameters for the production of ATP (ΔpH and ΔΨ) do not reflect the actual parameters for energy production. Certain strains of alkaliphilic Bacillus spp. possess large amounts of cytochrome c when grown at a high pH. The growth rate and yield are higher at pH 10 than at pH 7 in facultative alkaliphiles. These findings suggest that a large amount of cytochrome c at high pHs (e.g., pH 10) may be advantageous for sustaining growth. To date, isolated cytochromes c of alkaliphiles have a very low midpoint redox potential (less than +100mV) compared with those of neutralophiles (approximately +220mV). On the other hand, the redox potential of the electron acceptor from cytochrome c, that is, cytochrome c oxidase, seems to be normal (redox potential of cytochrome a=+250mV). This large difference in midpoint redox potential between cytochrome c and cytochrome a concomitant with the configuration (e.g., a larger negative ion capacity at the inner surface membrane than at the outer surface for the attraction of H^+ to the intracellular membrane and a large amount of cyrochrome c) supporting H^+-coupled electron transfer of cytochrome c may have an important meaning in the adaptation of alkaliphiles at high pHs. This respiratory system includes a more rapid and efficient H^+ and e^- flow across the membrane in alkaliphiles than in neutralophiles.

• 社団法人日本生物工学会の論文
• 2005-10-25

著者

• Matsuno Toshihide

  Research Institute of Genome-based Biofactory, National Institute of Advanced Industrial Science and

• Yumoto Isao

  Research Institute of Genome-based Biofactory, National Institute of Advanced Industrial Science and

• Yamazaki Koji

  Department of Cardiology, Saitama Cardiovascular and Respiratory Center

• 山崎 浩司

  北海道大学大学院水産科学研究院

• Yumoto Isao

  Research Institute Of Genome-based Biofactory National Institute Of Advanced Industrial Science And

• MATSUYAMA Hidetoshi

  Department of Bioscience and Technology, School of Engineering, Hokkaido Tokai University

• Yumoto Isao

  National Institute Of Advanced Industrial Science And Technology (aist)

• Matsuyama Hidetoshi

  Technology, School of Engineering, Hokkaido Tokai University

• Goto Toshitaka

  Research Institute of Genome-based Biofactory, National Institute of Advanced Industrial Science and

• Narisawa Megumi

  Research Institute of Genome-based Biofactory, National Institute of Advanced Industrial Science and

• Inoue Norio

  Department of Marine Bioresources Chemistry, Faculty of Fisheries, Hokkaido University

• 山崎 浩司

  北海道大学大学院水産科学研究科生物資源化学講座

• Yamazaki Koji

  Department Of Cardiology Saitama Cardiovascular And Respiratory Center

• Goto Toshitaka

  Research Institute Of Genome-based Biofactory National Institute Of Advanced Industrial Science And

• Yamazaki Koji

  Faculty Of Fisheries Sciences Hokkaido University

• Yamazaki Koji

  Laboratory Of Food Microbiology Faculty Of Fisheries Sciences Hokkaido University

• Narisawa Megumi

  Research Institute Of Genome-based Biofactory National Institute Of Advanced Industrial Science And

• Yumoto I

  National Institute Of Advanced Industrial Science And Technology (aist)

• Yumoto Isao

  Research Institute Of Biological Resources National Institute Of Advanced Industrial Science And Tec

• Matsuyama Hidetoshi

  Technology School Of Engineering Hokkaido Tokai University

• Matsuyama Hidetoshi

  Department Of Bioscience And Technology School Of Engineering Hokkaido Tokai University

• Yamazaki Koji

  Division Of Marine Life Science Faculty Of Fisheries Sciences Hokkaido University

• Matsuno Toshihide

  Research Institute Of Genome-based Biofactory National Institute Of Advanced Industrial Science And

• Yamazaki Koji

  Department Of Cardiology Department Of Internal Medicine The Jikei University School Of Medicine Kas

• Yamazaki Koji

  Department Of Marine Bioresources Chemistry Faculty Of Fisheries Hokkaido University

• Hishinuma-Narisawa Megumi

  Research Institute of Genome-based Biofactory, National Institute of Advanced Industrial Science and Technology (AIST)

• MATSUYAMA Hidetoshi

  Department of Agricultural Chemistry, The University of Tokyo

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