Energetics of pore opening in a voltage-gated K+ channel

Ofer Yifrach, Roderick MacKinnon

Research output: Contribution to journalArticlepeer-review

256 Scopus citations


Voltage-dependent gating in K+ channels results from the mechanical coupling of voltage sensor movements to pore opening. We used single and double mutations in the pore of the Shaker K+ channel to analyze a late concerted pore opening transition and interpreted the results in the context of known K+ channel structures. Gating sensitive mutations are located at mechanistically informative regions of the pore and are coupled energetically across distances up to 15 Å. We propose that the pore is intrinsically more stable when closed, and that to open the pore the voltage sensors must exert positive work by applying an outward lateral force near the inner helix bundle.

Original languageEnglish
Pages (from-to)231-239
Number of pages9
Issue number2
StatePublished - 18 Oct 2002
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology (all)


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