High-resolution structure of hair-cell tip links

Bechara Kachar, Marianne Parakkal, Mauricio Kurc, Yi Dong Zhao, Peter G. Gillespie

Research output: Contribution to journalArticlepeer-review

196 Scopus citations

Abstract

Transduction-channel gating by hair cells apparently requires a gating spring, an elastic element that transmits force to the channels. To determine whether the gating spring is the tip link, a filament interconnecting two stereocilia along the axis of mechanical sensitivity, we examined the tip link's structure at high resolution by using rapid-freeze, deep-etch electron microscopy. We found that the tip link is a right-handed, coiled double filament that usually forks into two branches before contacting a taller stereocilium; at the other end, several short filaments extend to the tip link from the shorter stereocilium. The structure of the tip link suggests that it is either a helical polymer or a braided pair of filamentous macromolecules and is thus likely to be relatively stiff and inextensible. Such behavior is incompatible with the measured elasticity of the gating spring, suggesting that the gating spring instead lies in series with the helical segment of the tip link.

Original languageEnglish (US)
Pages (from-to)13336-13341
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume97
Issue number24
DOIs
StatePublished - Nov 21 2000

ASJC Scopus subject areas

  • General

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