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==CRYSTAL STRUCTURE OF THE CELL CYCLE REGULATORY PROTEIN SUC1 REVEALS A NOVEL BETA-HINGE CONFORMATIONAL SWITCH==
==CRYSTAL STRUCTURE OF THE CELL CYCLE REGULATORY PROTEIN SUC1 REVEALS A NOVEL BETA-HINGE CONFORMATIONAL SWITCH==
<StructureSection load='1sce' size='340' side='right' caption='[[1sce]], [[Resolution|resolution]] 2.20&Aring;' scene=''>
<StructureSection load='1sce' size='340' side='right'caption='[[1sce]], [[Resolution|resolution]] 2.20&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
<table><tr><td colspan='2'>[[1sce]] is a 4 chain structure with sequence from [http://en.wikipedia.org/wiki/Schizosaccharomyces_pombe Schizosaccharomyces pombe]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1SCE OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1SCE FirstGlance]. <br>
<table><tr><td colspan='2'>[[1sce]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Schizosaccharomyces_pombe Schizosaccharomyces pombe]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1SCE OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1SCE FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene></td></tr>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.2&#8491;</td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1sce FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1sce OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1sce RCSB], [http://www.ebi.ac.uk/pdbsum/1sce PDBsum]</span></td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1sce FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1sce OCA], [https://pdbe.org/1sce PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1sce RCSB], [https://www.ebi.ac.uk/pdbsum/1sce PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1sce ProSAT]</span></td></tr>
</table>
</table>
== Function ==
== Function ==
[[http://www.uniprot.org/uniprot/CKS1_SCHPO CKS1_SCHPO]] Binds to the catalytic subunit of the cyclin dependent kinase (cdc2) and is essential for its biological function.  
[https://www.uniprot.org/uniprot/CKS1_SCHPO CKS1_SCHPO] Binds to the catalytic subunit of the cyclin dependent kinase (cdc2) and is essential for its biological function.
== Evolutionary Conservation ==
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
Check<jmol>
   <jmolCheckbox>
   <jmolCheckbox>
     <scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/sc/1sce_consurf.spt"</scriptWhenChecked>
     <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/sc/1sce_consurf.spt"</scriptWhenChecked>
     <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
     <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
     <text>to colour the structure by Evolutionary Conservation</text>
     <text>to colour the structure by Evolutionary Conservation</text>
   </jmolCheckbox>
   </jmolCheckbox>
</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/chain_selection.php?pdb_ID=2ata ConSurf].
</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=1sce ConSurf].
<div style="clear:both"></div>
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The Schizosaccharomyces pombe cell cycle-regulatory protein suc1, named as the suppressor of cdc2 temperature-sensitive mutations, is essential for cell cycle progression. To understand suc1 structure-function relationships and to help resolve conflicting interpretations of suc1 function based on genetic studies of suc1 and its functional homologs in both lower and higher eukaryotes, we have determined the crystal structure of the beta-interchanged suc1 dimer. Each domain consists of three alpha-helices and a four-stranded beta-sheet, completed by the interchange of terminal beta-strands between the two subunits. This beta-interchanged suc1 dimer, when compared with the beta-hairpin single-domain folds of suc1, reveals a beta-hinge motif formed by the conserved amino acid sequence HVPEPH. This beta-hinge mediates the subunit conformation and assembly of suc1: closing produces the intrasubunit beta-hairpin and single-domain fold, whereas opening leads to the intersubunit beta-strand interchange and interlocked dimer assembly reported here. This conformational switch markedly changes the surface accessibility of sequence-conserved residues available for recognition of cyclin-dependent kinase, suggesting a structural mechanism for beta-hinge-mediated regulation of suc1 biological function. Thus, suc1 belongs to the family of domain-swapping proteins, consisting of intertwined and dimeric protein structures in which the dual assembly modes regulate their function.
Crystal structure of the cell cycle-regulatory protein suc1 reveals a beta-hinge conformational switch.,Bourne Y, Arvai AS, Bernstein SL, Watson MH, Reed SI, Endicott JE, Noble ME, Johnson LN, Tainer JA Proc Natl Acad Sci U S A. 1995 Oct 24;92(22):10232-6. PMID:7479758<ref>PMID:7479758</ref>


From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
==See Also==
</div>
*[[Cyclin-dependent kinase regulatory subunit 3D structures|Cyclin-dependent kinase regulatory subunit 3D structures]]
== References ==
<references/>
__TOC__
__TOC__
</StructureSection>
</StructureSection>
[[Category: Large Structures]]
[[Category: Schizosaccharomyces pombe]]
[[Category: Schizosaccharomyces pombe]]
[[Category: Bourne, Y]]
[[Category: Bourne Y]]
[[Category: Tainer, J A]]
[[Category: Tainer JA]]
[[Category: Cell cycle regulatory protein]]

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