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The force-from-lipid (FFL) principle of mechanosensitivity, at large and in elements

  • Jinfeng Teng
  • Stephen Loukin
  • Andriy Anishkin
  • Ching KungEmail author
Invited Review

Abstract

Focus on touch and hearing distracts attention from numerous subconscious force sensors, such as the vital control of blood pressure and systemic osmolarity, and sensors in nonanimals. Multifarious manifestations should not obscure invariant and fundamental physicochemical principles. We advocate that force from lipid (FFL) is one such principle. It is based on the fact that the self-assembled bilayer necessitates inherent forces that are large and anisotropic, even at life’s origin. Functional response of membrane proteins is governed by bilayer force changes. Added stress can redirect these forces, leading to geometric changes of embedded proteins such as ion channels. The FFL principle was first demonstrated when purified bacterial mechanosensitive channel of large conductance (MscL) remained mechanosensitive (MS) after reconstituting into bilayers. This key experiment has recently been unequivocally replicated with two vertebrate MS K2p channels. Even the canonical Kv and the Drosophila canonical transient receptor potentials (TRPCs) have now been shown to be MS in biophysical and in physiological contexts, supporting the universality of the FFL paradigm. We also review the deterministic role of mechanical force during stem cell differentiation as well as the cell-cell and cell-matrix tethers that provide force communications. In both the ear hair cell and the worm’s touch neuron, deleting the cadherin or microtubule tethers reduces but does not eliminate MS channel activities. We found no evidence to distinguish whether these tethers directly pull on the channel protein or a surrounding lipid platform. Regardless of the implementation, pulling tether tenses up the bilayer. Membrane tenting is directly visible at the apexes of the stereocilia.

Keywords

Force-sensing Mechanosensitivity Lipid bilayer K2p Touch Hearing 

Notes

Acknowledgments

Work in our laboratories is supported by the Huck Institute of Life Sciences (A.A.) and NIH grant GM096088 and the Vilas Trust of the University of Wisconsin-Madison (to C.K.).

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Jinfeng Teng
    • 1
  • Stephen Loukin
    • 1
  • Andriy Anishkin
    • 2
  • Ching Kung
    • 3
    Email author
  1. 1.Laboratory of Molecular BiologyUniversity of WisconsinMadisonUSA
  2. 2.Department of Biochemistry and Center for Computational Proteomics at the Huck Institute of Life SciencesPennsylvania State UniversityCollegeUSA
  3. 3.Laboratory of Molecular Biology and Department of GeneticsUniversity of WisconsinMadisonUSA

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