3dw8

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{{STRUCTURE_3dw8| PDB=3dw8 | SCENE= }}
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==Structure of a Protein Phosphatase 2A Holoenzyme with B55 subunit==
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===Structure of a Protein Phosphatase 2A Holoenzyme with B55 subunit===
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<StructureSection load='3dw8' size='340' side='right' caption='[[3dw8]], [[Resolution|resolution]] 2.85&Aring;' scene=''>
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{{ABSTRACT_PUBMED_18922469}}
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== Structural highlights ==
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<table><tr><td colspan='2'>[[3dw8]] is a 8 chain structure with sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3DW8 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3DW8 FirstGlance]. <br>
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</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=MN:MANGANESE+(II)+ION'>MN</scene></td></tr>
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<tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=1ZN:(2S,3S,4E,6E,8S,9S)-3-AMINO-9-METHOXY-2,6,8-TRIMETHYL-10-PHENYLDECA-4,6-DIENOIC+ACID'>1ZN</scene>, <scene name='pdbligand=ACB:3-METHYL-BETA-D-ASPARTIC+ACID'>ACB</scene>, <scene name='pdbligand=DAL:D-ALANINE'>DAL</scene>, <scene name='pdbligand=DAM:N-METHYL-ALPHA-BETA-DEHYDROALANINE'>DAM</scene>, <scene name='pdbligand=FGA:GAMMA-D-GLUTAMIC+ACID'>FGA</scene></td></tr>
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<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">PPP2R1A ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 Homo sapiens]), PPP2R2A ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 Homo sapiens]), PPP2CA ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 Homo sapiens])</td></tr>
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<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Phosphoprotein_phosphatase Phosphoprotein phosphatase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.1.3.16 3.1.3.16] </span></td></tr>
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<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=3dw8 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3dw8 OCA], [http://www.rcsb.org/pdb/explore.do?structureId=3dw8 RCSB], [http://www.ebi.ac.uk/pdbsum/3dw8 PDBsum]</span></td></tr>
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</table>
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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/dw/3dw8_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/chain_selection.php?pdb_ID=2ata ConSurf].
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<div style="clear:both"></div>
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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
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Protein phosphatase 2A (PP2A) regulates many essential aspects of cellular physiology. Members of the regulatory B/B55/PR55 family are thought to play a key role in the dephosphorylation of Tau, whose hyperphosphorylation contributes to Alzheimer's disease. The underlying mechanisms of the PP2A-Tau connection remain largely enigmatic. Here, we report the complete reconstitution of a Tau dephosphorylation assay and the crystal structure of a heterotrimeric PP2A holoenzyme involving the regulatory subunit Balpha. We show that Balpha specifically and markedly facilitates dephosphorylation of the phosphorylated Tau in our reconstituted assay. The Balpha subunit comprises a seven-bladed beta propeller, with an acidic, substrate-binding groove located in the center of the propeller. The beta propeller latches onto the ridge of the PP2A scaffold subunit with the help of a protruding beta hairpin arm. Structure-guided mutagenesis studies revealed the underpinnings of PP2A-mediated dephosphorylation of Tau.
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==Function==
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Structure of a protein phosphatase 2A holoenzyme: insights into B55-mediated Tau dephosphorylation.,Xu Y, Chen Y, Zhang P, Jeffrey PD, Shi Y Mol Cell. 2008 Sep 26;31(6):873-85. PMID:18922469<ref>PMID:18922469</ref>
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[[http://www.uniprot.org/uniprot/2AAA_HUMAN 2AAA_HUMAN]] The PR65 subunit of protein phosphatase 2A serves as a scaffolding molecule to coordinate the assembly of the catalytic subunit and a variable regulatory B subunit. Required for proper chromosome segregation and for centromeric localization of SGOL1 in mitosis.<ref>PMID:16580887</ref> [[http://www.uniprot.org/uniprot/PP2AA_HUMAN PP2AA_HUMAN]] PP2A is the major phosphatase for microtubule-associated proteins (MAPs). PP2A can modulate the activity of phosphorylase B kinase casein kinase 2, mitogen-stimulated S6 kinase, and MAP-2 kinase. Cooperates with SGOL2 to protect centromeric cohesin from separase-mediated cleavage in oocytes specifically during meiosis I (By similarity). Can dephosphorylate SV40 large T antigen and p53/TP53. Activates RAF1 by dephosphorylating it at 'Ser-259'.<ref>PMID:9920888</ref> <ref>PMID:10801873</ref> <ref>PMID:22613722</ref> [[http://www.uniprot.org/uniprot/2ABA_HUMAN 2ABA_HUMAN]] The B regulatory subunit might modulate substrate selectivity and catalytic activity, and also might direct the localization of the catalytic enzyme to a particular subcellular compartment.
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==About this Structure==
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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[[3dw8]] is a 8 chain structure with sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3DW8 OCA].
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</div>
==See Also==
==See Also==
*[[Protein phosphatase|Protein phosphatase]]
*[[Protein phosphatase|Protein phosphatase]]
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*[[Serine/threonine protein phosphatase|Serine/threonine protein phosphatase]]
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==Reference==
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== References ==
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<ref group="xtra">PMID:018922469</ref><references group="xtra"/><references/>
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<references/>
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__TOC__
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</StructureSection>
[[Category: Homo sapiens]]
[[Category: Homo sapiens]]
[[Category: Phosphoprotein phosphatase]]
[[Category: Phosphoprotein phosphatase]]
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[[Category: Chen, Y.]]
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[[Category: Chen, Y]]
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[[Category: Jeffrey, P D.]]
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[[Category: Jeffrey, P D]]
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[[Category: Shi, Y.]]
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[[Category: Shi, Y]]
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[[Category: Xu, Y.]]
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[[Category: Xu, Y]]
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[[Category: Zhang, P.]]
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[[Category: Zhang, P]]
[[Category: B55]]
[[Category: B55]]
[[Category: Holoenzyme]]
[[Category: Holoenzyme]]

Revision as of 14:15, 18 December 2014

Structure of a Protein Phosphatase 2A Holoenzyme with B55 subunit

3dw8, resolution 2.85Å

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