i-SNAREs: Inhibitory SNAREs That Fine-Tune the Specificity of Membrane Fusion

A new functional class of SNAREs, designated inhibitory SNAREs (i-SNAREs), is described here. An i-SNARE inhibits fusion by substituting for or binding to a subunit of a fusogenic SNAREpin to form a nonfusogenic complex. Golgi-localized SNAREs were tested for i-SNARE activity by adding them as a fif...

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Veröffentlicht in:The Journal of cell biology 2004-01, Vol.164 (1), p.79-88
Hauptverfasser: Varlamov, Oleg, Volchuk, Allen, Rahimian, Vahid, Doege, Claudia A., Paumet, Fabienne, Eng, William S., Arango, Nancy, Parlati, Francesco, Ravazzola, Mariella, Orci, Lelio, Söllner, Thomas H., Rothman, James E.
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Sprache:eng
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Zusammenfassung:A new functional class of SNAREs, designated inhibitory SNAREs (i-SNAREs), is described here. An i-SNARE inhibits fusion by substituting for or binding to a subunit of a fusogenic SNAREpin to form a nonfusogenic complex. Golgi-localized SNAREs were tested for i-SNARE activity by adding them as a fifth SNARE together with four other SNAREs that mediate Golgi fusion reactions. A striking pattern emerges in which certain subunits of the cis-Golgi SNAREpin function as i-SNAREs that inhibit fusion mediated by the trans-Golgi SNAREpin, and vice versa. Although the opposing distributions of the cis- and trans-Golgi SNAREs themselves could provide for a countercurrent fusion pattern in the Golgi stack, the gradients involved would be strongly sharpened by the complementary countercurrent distributions of the i-SNAREs.
ISSN:0021-9525
1540-8140
DOI:10.1083/jcb.200307066