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| | {{STRUCTURE_3bw6| PDB=3bw6 | SCENE= }} | | {{STRUCTURE_3bw6| PDB=3bw6 | SCENE= }} |
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| - | '''Crystal structure of the longin domain of yeast Ykt6'''
| + | ===Crystal structure of the longin domain of yeast Ykt6=== |
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| - | ==Overview==
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| - | The evolutionarily conserved soluble N-ethylmaleimide-sensitive factor attachment protein receptor (SNARE) proteins are involved in the fusion of vesicles with their target membranes. While most SNAREs are permanently anchored to membranes by their transmembrane domains, the vesicle-associated SNARE Ykt6 has been found both in soluble and in membrane-bound pools. The R-SNARE Ykt6 is thought to mediate interactions between various Q-SNAREs by a reversible membrane-targeting cycle. Membrane attachment of Ykt6 is achieved by its C-terminal prenylation and palmitoylation motif succeeding the SNARE motif. In this study, we have analyzed full-length farnesylated Ykt6 from yeast and humans by biochemical and structural means. In vitro farnesylation of the C-terminal CAAX box of recombinant full-length Ykt6 resulted in stabilization of the native protein and a more compactly folded structure, as shown by size exclusion chromatography and limited proteolysis. Circular dichroism spectroscopy indicated a specific increase in the helical content of the farnesylated Ykt6 compared to the nonlipidated form or the single-longin domain, which correlated with a marked increase in stability as observed by heat denaturation experiments. Although highly soluble, farnesylated Ykt6 is capable of lipid membrane binding independent of the membrane charge, as shown by surface plasmon resonance. The crystal structure of the N-terminal longin domain of yeast Ykt6 (1-140) was determined at 2.5 A resolution. As similarly found in a previous NMR structure, the Ykt6 longin domain contains a hydrophobic patch at its surface that may accommodate the lipid moiety. In the crystal structure, this hydrophobic surface is buried in a crystallographic homomeric dimer interface. Together, these observations support a previously suggested closed conformation of cytosolic Ykt6, where the C-terminal farnesyl moiety folds onto a hydrophobic groove in the N-terminal longin domain.
| + | The line below this paragraph, {{ABSTRACT_PUBMED_18329045}}, adds the Publication Abstract to the page |
| | + | (as it appears on PubMed at http://www.pubmed.gov), where 18329045 is the PubMed ID number. |
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| | ==About this Structure== | | ==About this Structure== |
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| | [[Category: Vacuole fusion]] | | [[Category: Vacuole fusion]] |
| | [[Category: Ykt6p]] | | [[Category: Ykt6p]] |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 21:09:31 2008'' | + | |
| | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 05:26:17 2008'' |
Revision as of 02:26, 29 July 2008
Template:STRUCTURE 3bw6
Crystal structure of the longin domain of yeast Ykt6
Template:ABSTRACT PUBMED 18329045
About this Structure
3BW6 is a Single protein structure of sequence from Saccharomyces cerevisiae. Full crystallographic information is available from OCA.
Reference
Farnesylation of the SNARE protein Ykt6 increases its stability and helical folding., Pylypenko O, Schonichen A, Ludwig D, Ungermann C, Goody RS, Rak A, Geyer M, J Mol Biol. 2008 Apr 11;377(5):1334-45. Epub 2008 Feb 13. PMID:18329045
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