1pd1
From Proteopedia
(New page: 200px<br /><applet load="1pd1" size="450" color="white" frame="true" align="right" spinBox="true" caption="1pd1, resolution 2.60Å" /> '''Crystal structure of...) |
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| - | [[Image:1pd1.gif|left|200px]]<br /><applet load="1pd1" size=" | + | [[Image:1pd1.gif|left|200px]]<br /><applet load="1pd1" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="1pd1, resolution 2.60Å" /> | caption="1pd1, resolution 2.60Å" /> | ||
'''Crystal structure of the COPII coat subunit, Sec24, complexed with a peptide containing the DxE cargo sorting signal of yeast Sys1 protein'''<br /> | '''Crystal structure of the COPII coat subunit, Sec24, complexed with a peptide containing the DxE cargo sorting signal of yeast Sys1 protein'''<br /> | ||
==Overview== | ==Overview== | ||
| - | The COPII coat buds transport vesicles from the endoplasmic reticulum that | + | The COPII coat buds transport vesicles from the endoplasmic reticulum that incorporate cargo and SNARE molecules. Here, we show that recognition of the ER-Golgi SNAREs Bet1, Sed5, and Sec22 occurs through three binding sites on the Sec23/24 subcomplex of yeast COPII. The A site binds to the YNNSNPF motif of Sed5. The B site binds to Lxx-L/M-E sequences present in both the Bet1 and Sed5 molecules, as well as to the DxE cargo-sorting signal. A third, spatially distinct site binds to Sec22. COPII selects the free v-SNARE form of Bet1 because the LxxLE sequence is sequestered in the four-helix bundle of the v-/t-SNARE complex. COPII favors Sed5 within the Sed5/Bos1/Sec22 t-SNARE complex because t-SNARE assembly removes autoinhibitory contacts to expose the YNNSNPF motif. The COPII coat seems to be a specific conductor of the fusogenic forms of these SNAREs, suggesting how vesicle fusion specificity may be programmed during budding. |
==About this Structure== | ==About this Structure== | ||
| - | 1PD1 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Saccharomyces_cerevisiae Saccharomyces cerevisiae] with ZN as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http:// | + | 1PD1 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Saccharomyces_cerevisiae Saccharomyces cerevisiae] with <scene name='pdbligand=ZN:'>ZN</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1PD1 OCA]. |
==Reference== | ==Reference== | ||
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[[Category: Saccharomyces cerevisiae]] | [[Category: Saccharomyces cerevisiae]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
| - | [[Category: Bickford, L | + | [[Category: Bickford, L C.]] |
[[Category: Goldberg, J.]] | [[Category: Goldberg, J.]] | ||
[[Category: Mossessova, E.]] | [[Category: Mossessova, E.]] | ||
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[[Category: transport protein]] | [[Category: transport protein]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 14:27:34 2008'' |
Revision as of 12:27, 21 February 2008
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Crystal structure of the COPII coat subunit, Sec24, complexed with a peptide containing the DxE cargo sorting signal of yeast Sys1 protein
Overview
The COPII coat buds transport vesicles from the endoplasmic reticulum that incorporate cargo and SNARE molecules. Here, we show that recognition of the ER-Golgi SNAREs Bet1, Sed5, and Sec22 occurs through three binding sites on the Sec23/24 subcomplex of yeast COPII. The A site binds to the YNNSNPF motif of Sed5. The B site binds to Lxx-L/M-E sequences present in both the Bet1 and Sed5 molecules, as well as to the DxE cargo-sorting signal. A third, spatially distinct site binds to Sec22. COPII selects the free v-SNARE form of Bet1 because the LxxLE sequence is sequestered in the four-helix bundle of the v-/t-SNARE complex. COPII favors Sed5 within the Sed5/Bos1/Sec22 t-SNARE complex because t-SNARE assembly removes autoinhibitory contacts to expose the YNNSNPF motif. The COPII coat seems to be a specific conductor of the fusogenic forms of these SNAREs, suggesting how vesicle fusion specificity may be programmed during budding.
About this Structure
1PD1 is a Single protein structure of sequence from Saccharomyces cerevisiae with as ligand. Full crystallographic information is available from OCA.
Reference
SNARE selectivity of the COPII coat., Mossessova E, Bickford LC, Goldberg J, Cell. 2003 Aug 22;114(4):483-95. PMID:12941276
Page seeded by OCA on Thu Feb 21 14:27:34 2008
