Constraints on Models for the Flagellar Rotary Motor

@article{Berg2000, abstract = {Most bacteria that swim are propelled by flagellar filaments, each driven at its base by a rotary motor embedded in the cell wall and cytoplasmic membrane. A motor is about 45 nm in diameter and made up of about 20 different kinds of parts. It is assembled from the inside out. It is powered by a proton (or in some species, a sodium-ion) flux. It steps at least 400 times per revolution. At low speeds and high torques, about 1000 protons are required per revolution, speed is proportional to protonmotive force, and torque varies little with temperature or hydrogen isotope. At high speeds and low torques, torque increases with temperature and is sensitive to hydrogen isotope. At room temperature, torque varies remarkably little with speed from about -100 Hz (the present limit of measurement) to about 200 Hz, and then it declines rapidly, reaching zero at about 300 Hz. These are facts that motor models should explain. None of the existing models for the flagellar rotary motor completely do so.}, author = {Berg, Howard C. }, citeulike-article-id = {2746744}, doi = {http://dx.doi.org/10.2307/3066711}, journal = {Philosophical Transactions: Biological Sciences}, keywords = {bacteria\_flagella\_project, biophysics}, number = {1396}, pages = {491--501}, posted-at = {2008-05-02 19:18:02}, priority = {2}, publisher = {The Royal Society}, title = {Constraints on Models for the Flagellar Rotary Motor}, url = {http://dx.doi.org/10.2307/3066711}, volume = {355}, year = {2000} }

TY - JOUR ID - Berg2000 L3 - citeulike-article-id:2746744 TI - Constraints on Models for the Flagellar Rotary Motor JF - Philosophical Transactions: Biological Sciences VL - 355 IS - 1396 SP - 491 EP - 501 PB - The Royal Society N2 - Most bacteria that swim are propelled by flagellar filaments, each driven at its base by a rotary motor embedded in the cell wall and cytoplasmic membrane. A motor is about 45 nm in diameter and made up of about 20 different kinds of parts. It is assembled from the inside out. It is powered by a proton (or in some species, a sodium-ion) flux. It steps at least 400 times per revolution. At low speeds and high torques, about 1000 protons are required per revolution, speed is proportional to protonmotive force, and torque varies little with temperature or hydrogen isotope. At high speeds and low torques, torque increases with temperature and is sensitive to hydrogen isotope. At room temperature, torque varies remarkably little with speed from about -100 Hz (the present limit of measurement) to about 200 Hz, and then it declines rapidly, reaching zero at about 300 Hz. These are facts that motor models should explain. None of the existing models for the flagellar rotary motor completely do so. KW - bacteria_flagella_project KW - biophysics AU - Berg, Howard PY - 2000/// UR - http://dx.doi.org/10.2307/3066711 ER -