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2p51

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[[Image:2p51.gif|left|200px]]<br /><applet load="2p51" size="350" color="white" frame="true" align="right" spinBox="true"
 
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caption="2p51, resolution 1.40&Aring;" />
 
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'''Crystal structure of the S. pombe Pop2p deadenylation subunit'''<br />
 
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==Overview==
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==Crystal structure of the S. pombe Pop2p deadenylation subunit==
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Deadenylation is the first and probably also rate-limiting step of controlled mRNA decay in eukaryotes and therefore central for the overall rate of gene expression. In yeast, the process is maintained by the mega-Dalton Ccr4-Not complex, of which both the Ccr4p and Pop2p subunits are 3'-5' exonucleases potentially responsible for the deadenylation reaction. Here, we present the crystal structure of the Pop2p subunit from Schizosaccharomyces pombe determined to 1.4 A resolution and show that the enzyme is a competent ribonuclease with a tunable specificity towards poly-A. In contrast to S. cerevisiae Pop2p, the S. pombe enzyme contains a fully conserved DEDDh active site, and the high resolution allows for a detailed analysis of its configuration, including divalent metal ion binding. Functional data further indicates that the identity of the ions in the active site can modulate both activity and specificity of the enzyme, and finally structural superposition of single nucleotides and poly-A oligonucleotides provide insight into the catalytic cycle of the protein.
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<StructureSection load='2p51' size='340' side='right'caption='[[2p51]], [[Resolution|resolution]] 1.40&Aring;' scene=''>
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== Structural highlights ==
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==About this Structure==
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<table><tr><td colspan='2'>[[2p51]] is a 1 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=2P51 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2P51 FirstGlance]. <br>
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2P51 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Schizosaccharomyces_pombe Schizosaccharomyces pombe] with <scene name='pdbligand=MG:'>MG</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2P51 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]] 1.4&#8491;</td></tr>
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene></td></tr>
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==Reference==
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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=2p51 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2p51 OCA], [https://pdbe.org/2p51 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2p51 RCSB], [https://www.ebi.ac.uk/pdbsum/2p51 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2p51 ProSAT]</span></td></tr>
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The 1.4-A crystal structure of the S. pombe Pop2p deadenylase subunit unveils the configuration of an active enzyme., Jonstrup AT, Andersen KR, Van LB, Brodersen DE, Nucleic Acids Res. 2007;35(9):3153-64. Epub 2007 Apr 22. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=17452359 17452359]
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/CAF1_SCHPO CAF1_SCHPO] Acts as the catalytic component of the CCR4-NOT core complex, which in the nucleus seems to be a general transcription factor, and in the cytoplasm the major mRNA deadenylase involved in mRNA turnover. In vivo and in vitro, caf1 has 3'-exoribonuclease activity with a preference for poly(A) RNAs.<ref>PMID:17452359</ref> <ref>PMID:19307292</ref>
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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/p5/2p51_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=2p51 ConSurf].
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<div style="clear:both"></div>
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== References ==
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<references/>
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__TOC__
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</StructureSection>
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[[Category: Large Structures]]
[[Category: Schizosaccharomyces pombe]]
[[Category: Schizosaccharomyces pombe]]
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[[Category: Single protein]]
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[[Category: Andersen KR]]
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[[Category: Andersen, K R.]]
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[[Category: Brodersen DE]]
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[[Category: Brodersen, D E.]]
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[[Category: Thyssen Jonstrup A]]
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[[Category: Jonstrup, A Thyssen.]]
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[[Category: Van LB]]
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[[Category: Van, L B.]]
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[[Category: MG]]
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[[Category: dedd nuclease fold]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 18:25:55 2008''
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Current revision

Crystal structure of the S. pombe Pop2p deadenylation subunit

PDB ID 2p51

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