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- W127960901 abstract "Flagellar and ciliary motility are driven by the activity of dynein, which produces microtubule sliding within the axonemes. Our goal is to understand how dynein motile activity is regulated to produce the characteristic oscillatory movement of flagella. Analysis of various parameters, such as frequency and shear angle in beating flagella, is important for understanding the time-dependent changes of microtubule sliding amounts along the flagellum. Demembranated flagella can be reactivated in a wide range of ATP concentrations (from 2 μM to several mM) and the beat frequency increases with an increase in ATP. By imposed vibration of a micropipette that caught a sperm head by suction, however, the oscillatory motion can be modulated so as to synchronize to the vibration frequency over a range of 20–70 Hz at 2 mM ATP. The time-averaged sliding velocity calculated as a product of shear angle and vibration frequency decreases when the imposed frequency is below the undriven flagellar beat frequency, but at higher imposed frequencies, it remains constant. In addition to the role of ATP, the mechanical force of bending is involved in the activation of dynein. In elastase-treated axonemes, bending-dependent regulation of microtubule sliding is achieved. This chapter provides an overview of several approaches, using sea urchin sperm flagella, to studying the measurements in the regulation of dynein activity with or without mechanical force." @default.
- W127960901 created "2016-06-24" @default.
- W127960901 creator A5020914191 @default.
- W127960901 date "2013-01-01" @default.
- W127960901 modified "2023-10-14" @default.
- W127960901 title "Measuring the Regulation of Dynein Activity During Flagellar Motility" @default.
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- W127960901 doi "https://doi.org/10.1016/b978-0-12-397945-2.00009-3" @default.
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