The relationship of torque-speed on the Na+-driven flagellar motor

Akihiko Ishijima, Yoshiyuki Sowa, Michio Homma

研究成果: Conference contribution

抄録

The torque-speed relationship of the Na+-driven flagellar motor of Vibrio alginolyticus was investigated. The rotation rate of the motor was measured by following the position of a bead, attached to a flagellar filament, using optical nanometry. In the presence of 50 mM NaCl, the generated torque was relatively constant (∼3800 pN nm) at lower speeds (speeds up to ∼300 Hz) and then decreased steeply, similar to the H+-driven flagellar motor of E. coli. When the external NaCl concentration was varied, the generated torque of the flagellar motor was changed over a wide range of speeds. This result could be reproduced using a simple kinetic model, which takes into consideration the association and dissociation of Na+ onto the motor. These results imply that for a complete understanding of the mechanism of flagellar rotation it is essential to consider both the electrochemical gradient and the absolute concentration of the coupling ion.

本文言語English
ホスト出版物のタイトルProceedings of the 2005 International Symposium on Micro-NanoMechatronics and Human Science, Eighth Symposium on Micro- and Nano-Mechatronics for Information-Based Society - The 21st Century COE Progr
ページ数1
DOI
出版ステータスPublished - 2005 12 1
イベント2005 International Symposium on Micro-NanoMechatronics and Human Science, Eighth Symposium on Micro- and Nano-Mechatronics for Information-Based Society - The 21st Century COE Program - Nagayo, Japan
継続期間: 2005 11 72005 11 9

出版物シリーズ

名前Proceedings of the 2005 International Symposium on Micro-NanoMechatronics and Human Science, Eighth Symposium on Micro- and Nano-Mechatronics for Information-Based Society - The 21st Century COE Progr
2005

Other

Other2005 International Symposium on Micro-NanoMechatronics and Human Science, Eighth Symposium on Micro- and Nano-Mechatronics for Information-Based Society - The 21st Century COE Program
国/地域Japan
CityNagayo
Period05/11/705/11/9

ASJC Scopus subject areas

  • 工学(全般)

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