Gap junction channel gating

Feliksas F. Bukauskas, Vytautas Verselis

Research output: Contribution to journalArticle

203 Citations (Scopus)

Abstract

Over the last two decades, the view of gap junction (GJ) channel gating has changed from one with GJs having a single transjunctional voltage-sensitive (Vj-sensitive) gating mechanism to one with each hemichannel of a formed GJ channel, as well as unapposed hemichannels, containing two, molecularly distinct gating mechanisms. These mechanisms are termed fast gating and slow or 'loop' gating. It appears that the fast gating mechanism is solely sensitive to Vj and induces fast gating transitions between the open state and a particular substate, termed the residual conductance state. The slow gating mechanism is also sensitive to Vj, but there is evidence that this gate may mediate gating by transmembrane voltage (Vm), intracellular Ca2+ and pH, chemical uncouplers and GJ channel opening during de novo channel formation. A distinguishing feature of the slow gate is that the gating transitions appear to be slow, consisting of a series of transient substates en route to opening and closing. Published reports suggest that both sensorial and gating elements of the fast gating mechanism are formed by transmembrane and cytoplamic components of connexins among which the N terminus is most essential and which determines gating polarity. We propose that the gating element of the slow gating mechanism is located closer to the central region of the channel pore and serves as a 'common' gate linked to several sensing elements that are responsive to different factors and located in different regions of the channel.

Original languageEnglish (US)
Pages (from-to)42-60
Number of pages19
JournalBiochimica et Biophysica Acta - Biomembranes
Volume1662
Issue number1-2
DOIs
StatePublished - Mar 23 2004

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Gap Junctions
Connexins
Electric potential

Keywords

  • Channel
  • Connexin
  • Intercellular communication
  • Voltage and chemical gating

ASJC Scopus subject areas

  • Biochemistry
  • Cell Biology
  • Biophysics

Cite this

Gap junction channel gating. / Bukauskas, Feliksas F.; Verselis, Vytautas.

In: Biochimica et Biophysica Acta - Biomembranes, Vol. 1662, No. 1-2, 23.03.2004, p. 42-60.

Research output: Contribution to journalArticle

Bukauskas, Feliksas F. ; Verselis, Vytautas. / Gap junction channel gating. In: Biochimica et Biophysica Acta - Biomembranes. 2004 ; Vol. 1662, No. 1-2. pp. 42-60.
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