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Figure 3


Fig. 3. Effects of imposed bending on the reversal of microtubule sliding in elastase-treated quiescent flagellar axonemes. (A-C) Video images with explanatory diagrams. UV flashes induced splitting of the flagellum into two doublet bundles at the basal P-bend (A). Bending the distal part of the region of overlap of two bundles in the P-bend direction (B) induced further forward sliding (UV2), whereas bending in the R-bend direction (C) induced backward sliding (UV3, 4) (supplementary material Movies 1 and 2). (D) Relative frequency of sliding patterns induced by imposed bending. (E) Tracings showing that the effect of the presence of the original basal P-bend on the direction of sliding. When the basal end of the flagellum was severed (Cut) after induction of the forward sliding at the basal P-bend, and the proximal region was bent to induce a new R-bend in the more distal region of the P-bend (Bending), subsequent application of ATP (UV3) induced backward sliding (open arrows) only at the proximal part of the imposed bending. However, the distal part still continued forward sliding (filled arrows).





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