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Ren, Yi; Yip, Calvin K.; Tripathi, Arati; Huie, David; Jeffrey, Philip D.; Walz, Thomas; Hughson, Frederick M.
Cell, 12/2009, Volume: 139, Issue: 6Journal Article
Vesicle trafficking requires membrane fusion, mediated by SNARE proteins, and upstream events that probably include “tethering,” an initial long-range attachment between a vesicle and its target organelle. Among the factors proposed to mediate tethering are a set of multisubunit tethering complexes (MTCs). The Dsl1 complex, with only three subunits, is the simplest known MTC and is essential for the retrograde traffic of COPI-coated vesicles from the Golgi to the ER. To elucidate structural principles underlying MTC function, we have determined the structure of the Dsl1 complex, revealing a tower containing at its base the binding sites for two ER SNAREs and at its tip a flexible lasso for capturing vesicles. The Dsl1 complex binds to individual SNAREs via their N-terminal regulatory domains and also to assembled SNARE complexes; moreover, it is capable of accelerating SNARE complex assembly. Our results suggest that even the simplest MTC may be capable of orchestrating vesicle capture, uncoating, and fusion.
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