Functional impact of syntaxin on gating of N-type and Q-type calcium channels

I. Bezprozvanny, R. H. Scheller, R. W. Tsien

Research output: Contribution to journalArticle

368 Citations (Scopus)

Abstract

RAPID and reliable synaptic transmission depends upon the close proximity of voltage-gated calcium channels and neurotransmitter-containing vesicles in the presynaptic terminal1. Although it is clear that a local Ca2+ rise conveys the crucial signal from Ca2+ channels to the exocytotic mechanism2, little is known about whether communication ever proceeds in the opposite direction, from the release machinery to Ca2+ channels3,4. To look for such signalling, we examined the interaction of various types of voltage-gated Ca2+ channels with syntaxin, a presynaptic membrane protein of relative molecular mass 35,000 (refs 5-7) which may play a key part in synaptic vesicle docking and fusion8 and which interacts strongly with N-type Ca2+ channels5,6,9-12. Here we report that co-expression of syntaxin 1A with N-type channels in Xenopus oocytes sharply decreases the availability of these channels. This is due to the stabilization of channel inactivation rather than to a simple block or lack of channel expression, because it is overcome by strong hyperpolarization. Deletion of syntaxin's carboxy-terminal transmembrane domain abolishes its functional effect on Ca2+ channels. Syntaxin produced a similar effect on Q-type Ca2+ channels encoded by α1A (refs 13-15) but not on L-type Ca2+-channels. Thus, the syntaxin effect is specific for Ca2+ channel types that Participate in fast transmitter release in the mammalian central nervous system (ref. 16 and therein). We hypothesize that, in addition to acting as a vesicle-docking site, syntaxin may influence presynaptic Ca2+ channels, opposing Ca2+ entry where it is not advantageous, but allowing it at release sites where synaptic vesicles have become docked and/or ready for fusion.

Original languageEnglish (US)
Pages (from-to)623-626
Number of pages4
JournalNature
Volume378
Issue number6557
StatePublished - Dec 7 1995

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Q-Type Calcium Channels
Qa-SNARE Proteins
Synaptic Vesicles
Syntaxin 1
Calcium Channels
Xenopus
Synaptic Transmission
Oocytes
Neurotransmitter Agents
Membrane Proteins
Central Nervous System
Communication

ASJC Scopus subject areas

  • General

Cite this

Bezprozvanny, I., Scheller, R. H., & Tsien, R. W. (1995). Functional impact of syntaxin on gating of N-type and Q-type calcium channels. Nature, 378(6557), 623-626.

Functional impact of syntaxin on gating of N-type and Q-type calcium channels. / Bezprozvanny, I.; Scheller, R. H.; Tsien, R. W.

In: Nature, Vol. 378, No. 6557, 07.12.1995, p. 623-626.

Research output: Contribution to journalArticle

Bezprozvanny, I, Scheller, RH & Tsien, RW 1995, 'Functional impact of syntaxin on gating of N-type and Q-type calcium channels', Nature, vol. 378, no. 6557, pp. 623-626.
Bezprozvanny, I. ; Scheller, R. H. ; Tsien, R. W. / Functional impact of syntaxin on gating of N-type and Q-type calcium channels. In: Nature. 1995 ; Vol. 378, No. 6557. pp. 623-626.
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