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Direct evidence for tension development between flagellar doublet microtubules
1Department of Physiology, School of Medical Sciences, University of Bristol, University Walk, United Kingdom.
Experimental Cell Research
|December 1, 1994
Summary
Researchers found resistance to sliding between flagellar doublet microtubules, indicating tension development. This tension, linked to ATP hydrolysis, was absent when vanadate was present.
Area of Science:
- Biochemistry
- Cell Biology
- Biophysics
Background:
- Flagellar movement relies on the coordinated sliding of doublet microtubules.
- The precise mechanisms generating forces and resistances within flagellar structures remain incompletely understood.
Purpose of the Study:
- To investigate the existence and nature of resistance to sliding within the interdoublet gap of flagellar doublet microtubules.
- To elucidate the role of adenosine triphosphate (ATP) hydrolysis in generating tension between doublet microtubules.
Main Methods:
- Utilized isolated ribbons of flagellar doublet microtubules.
- Employed photolytic release of caged ATP to precisely control ATP availability.
- Observed and analyzed the structural responses of individual microtubule specimens.
Main Results:
- Demonstrated a measurable resistance to sliding in the interdoublet gap.
- Observed distortions in the helical superstructure, specifically a reduction in helical pitch, indicating tension development.
- Found that tension development was inhibited in the presence of vanadate, an ATP hydrolysis inhibitor.
Conclusions:
- A resistive force exists within the interdoublet gap that opposes microtubule sliding.
- ATP hydrolysis is a key factor in generating tension between doublet microtubules.
- Vanadate's inhibitory effect suggests a role for the ATP hydrolysis cycle in tension generation.