2b26

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[[Image:2b26.jpg|left|200px]]<br /><applet load="2b26" size="350" color="white" frame="true" align="right" spinBox="true"
 
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caption="2b26, resolution 3.2&Aring;" />
 
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'''The crystal structure of the protein complex of yeast Hsp40 Sis1 and Hsp70 Ssa1'''<br />
 
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==Overview==
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==The crystal structure of the protein complex of yeast Hsp40 Sis1 and Hsp70 Ssa1==
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Heat shock protein (Hsp) 40 facilitates the critical role of Hsp70 in a number of cellular processes such as protein folding, assembly, degradation and translocation in vivo. Hsp40 and Hsp70 stay in close contact to achieve these diverse functions. The conserved C-terminal EEVD motif in Hsp70 has been shown to regulate Hsp40-Hsp70 interaction by an unknown mechanism. Here, we provide a structural basis for this regulation by determining the crystal structure of yeast Hsp40 Sis1 peptide-binding fragment complexed with the Hsp70 Ssa1 C-terminal. The Ssa1 extreme C-terminal eight residues, G634PTVEEVD641, form a beta-strand with the domain I of Sis1 peptide-binding fragment. Surprisingly, the Ssa1 C-terminal binds Sis1 at the site where Sis1 interacts with the non-native polypeptides. The negatively charged residues within the EEVD motif in Ssa1 C-terminal form extensive charge-charge interactions with the positively charged residues in Sis1. The structure-based mutagenesis data support the structural observations.
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<StructureSection load='2b26' size='340' side='right'caption='[[2b26]], [[Resolution|resolution]] 3.20&Aring;' scene=''>
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== Structural highlights ==
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==About this Structure==
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<table><tr><td colspan='2'>[[2b26]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Drosophila_melanogaster Drosophila melanogaster] and [https://en.wikipedia.org/wiki/Saccharomyces_cerevisiae Saccharomyces cerevisiae]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2B26 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2B26 FirstGlance]. <br>
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2B26 is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Drosophila_melanogaster Drosophila melanogaster] and [http://en.wikipedia.org/wiki/Saccharomyces_cerevisiae Saccharomyces cerevisiae]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2B26 OCA].
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 3.2&#8491;</td></tr>
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=2b26 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2b26 OCA], [https://pdbe.org/2b26 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2b26 RCSB], [https://www.ebi.ac.uk/pdbsum/2b26 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2b26 ProSAT]</span></td></tr>
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==Reference==
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</table>
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Crystal structure of yeast Sis1 peptide-binding fragment and Hsp70 Ssa1 C-terminal complex., Li J, Wu Y, Qian X, Sha B, Biochem J. 2006 Sep 15;398(3):353-60. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=16737444 16737444]
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== Function ==
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[https://www.uniprot.org/uniprot/SIS1_YEAST SIS1_YEAST] Required for nuclear migration during mitosis. It is required for the normal initiation of translation. Might mediate the dissociation of a specific protein complex of the translation machinery. Essential for viability.
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== Evolutionary Conservation ==
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[[Image:Consurf_key_small.gif|200px|right]]
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Check<jmol>
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<jmolCheckbox>
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<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/b2/2b26_consurf.spt"</scriptWhenChecked>
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<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
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<text>to colour the structure by Evolutionary Conservation</text>
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</jmolCheckbox>
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</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=2b26 ConSurf].
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<div style="clear:both"></div>
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__TOC__
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</StructureSection>
[[Category: Drosophila melanogaster]]
[[Category: Drosophila melanogaster]]
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[[Category: Protein complex]]
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[[Category: Large Structures]]
[[Category: Saccharomyces cerevisiae]]
[[Category: Saccharomyces cerevisiae]]
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[[Category: Li, J.]]
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[[Category: Li J]]
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[[Category: Qian, X.]]
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[[Category: Qian X]]
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[[Category: Sha, B.]]
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[[Category: Sha B]]
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[[Category: Wu, Y.]]
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[[Category: Wu Y]]
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[[Category: hsp40 sis1 hsp70 ssa1]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 16:33:26 2008''
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Current revision

The crystal structure of the protein complex of yeast Hsp40 Sis1 and Hsp70 Ssa1

PDB ID 2b26

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