Axoneme Beat: Regulation of Dynein Motor Activity

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Discussion Overview

The discussion revolves around the coordination of dynein motors within the axoneme and the mechanisms behind ciliary and flagellar beating. Participants explore concepts related to oscillating instabilities and the regulatory role of axoneme motion on dynein activity, referencing existing literature and models.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant describes axonemes undergoing ‘oscillating instabilities’ due to changes in system parameters, leading to oscillatory motion generated by dynein detachment and microtubule elasticity.
  • Another participant inquires if the discussion pertains to ciliary or flagellar beating, seeking clarification on the applicability of the initial idea to both mechanisms.
  • A third participant references the 'sliding filament model' and specific literature on ciliary beating, expressing difficulty in synthesizing a coherent understanding of the extensive literature on the topic.

Areas of Agreement / Disagreement

The discussion reflects some uncertainty regarding the applicability of concepts to both ciliary and flagellar beating, as well as differing levels of familiarity with the relevant literature among participants. No consensus is reached on the accuracy of the initial description or its implications.

Contextual Notes

Participants note the complexity of synthesizing information from extensive literature, indicating potential limitations in understanding the full context of dynein motor coordination and axoneme mechanics.

bluepen
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Hey there,

I've been trying to get my head around how the dynein motors in it are coordinated, and I was wondering if this extremely brief paragraph was accurate? It's just intended to be an 'here's the toe I put in the terrifying waters of actual papers' bit for an essay.

An axoneme can undergo ‘oscillating instabilities’, in which an oscillating state occurs when it is no longer stable to maintain a non-oscillating state because of a change in the parameters of the system. For example, a group of dyneins may suddenly lose contact with the filament due to an initial few motors losing contact and inducing a domino-effect. When this mass-detachment of dyneins is followed by another build-up of force, oscillatory motion is generated, because of the elasticity of the microtubules. Current study points to the beat of the axoneme itself as a regulatory mechanism for dynein activity.

Thanks,
 
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Are you referring to ciliary/flagellar beating?
 
Yes:)

I know their undulation mechanisms are different, but this idea still applies to both of them no?
 
I'm vaguely familiar with the 'sliding filament model', and work by Dillon and Fauci on modeling ciliary beating here:

Dillon, R. and Fauci, L.J., An integrative model of internal axoneme mechanics and external fluid dynamics in ciliary beating. J. Theor. Biol. v207. 415-430.

I'm having trouble understanding the context of your question. Are there specific papers/results you are reviewing? The literature is rather extensive and it is difficult (for me) to synthesize a coherent picture.
 

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