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- W4242206548 abstract "Flagella of Chlamydomonas mutants lacking the central pair of microtubules or radial spokes do not beat; however, axonemes isolated from these mutants were found to display vigorous bending movements in the presence of ATP and various salts, sugars, alcohols, and other organic compounds. For example, about 15% of the total axonemes isolated from pf18, a mutant lacking the central pair, displayed beating in the presence of 10 mM MgSO(4) and 0.2 mM ATP at about 22 Hz, while none beat with the same concentration of ATP and < or = 5 mM or > or = 25 mM MgSO(4). The beat frequency and waveform of beating pf18 axonemes were similar to those of wild type axonemes beating under the same conditions. Similarly, 10-50% of the axonemes beat in the presence of 0.5 M sucrose, 2.0 M glycerol, or 1.7 M[10% (v/v)] ethanol. The appearance of motility did not correlate with the change in axonemal ATPase; however, these substances at those concentrations commonly increased the amplitude of nanometer-scale oscillation (hyper-oscillation) in pf18 axonemes, as well as the extent of ATP-induced sliding disintegration of protease-treated axonemes. Axonemes of double mutants lacking both the central pair and various subspecies of inner-arm dynein also beat at increased MgSO(4) concentrations, but axonemes lacking outer-arm dynein in addition to the central pair did not beat. These and other observations suggest that small molecules perturb the regulation of microtubule sliding through some change in water activity or osmotic stress. Axonemes must have an intrinsic ability to beat without the central pair/radial spokes under a variety of non-physiological solution conditions, as long as the outer dynein arms are present. Apparently, the major function of the central pair/radial spoke structures is to restore this activity under physiological conditions." @default.
- W4242206548 created "2022-05-12" @default.
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- W4242206548 date "2000-01-01" @default.
- W4242206548 modified "2023-09-30" @default.
- W4242206548 title "Vigorous beating ofChlamydomonas axonemes lacking central pair/radial spoke structures in the presence of salts and organic compounds" @default.
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- W4242206548 doi "https://doi.org/10.1002/1097-0169(200007)46:3<190::aid-cm4>3.0.co;2-" @default.
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