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[[Image:2pkg.gif|left|200px]]


{{Structure
==Structure of a complex between the A subunit of protein phosphatase 2A and the small t antigen of SV40==
|PDB= 2pkg |SIZE=350|CAPTION= <scene name='initialview01'>2pkg</scene>, resolution 3.30&Aring;
<StructureSection load='2pkg' size='340' side='right'caption='[[2pkg]], [[Resolution|resolution]] 3.30&Aring;' scene=''>
|SITE=  
== Structural highlights ==
|LIGAND= <scene name='pdbligand=ZN:ZINC ION'>ZN</scene>
<table><tr><td colspan='2'>[[2pkg]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] and [https://en.wikipedia.org/wiki/Macaca_mulatta_polyomavirus_1 Macaca mulatta polyomavirus 1]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2PKG OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2PKG FirstGlance]. <br>
|ACTIVITY=  
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 3.3&#8491;</td></tr>
|GENE= PPP2R1A ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 Homo sapiens])
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ZN:ZINC+ION'>ZN</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=2pkg FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2pkg OCA], [https://pdbe.org/2pkg PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2pkg RCSB], [https://www.ebi.ac.uk/pdbsum/2pkg PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2pkg ProSAT]</span></td></tr>
</table>
== Function ==
[https://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>
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/pk/2pkg_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </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/main_output.php?pdb_ID=2pkg ConSurf].
<div style="clear:both"></div>


'''Structure of a complex between the A subunit of protein phosphatase 2A and the small t antigen of SV40'''
==See Also==
 
*[[Protein phosphatase 3D structures|Protein phosphatase 3D structures]]
 
== References ==
==Overview==
<references/>
The small t antigen (ST) of DNA tumor virus SV40 facilitates cellular transformation by disrupting the functions of protein phosphatase 2A (PP2A) through a poorly defined mechanism. The crystal structure of the core domain of SV40 ST bound to the scaffolding subunit of human PP2A reveals that the ST core domain has a novel zinc-binding fold and interacts with the conserved ridge of HEAT repeats 3-6, which overlaps with the binding site for the B' (also called PR61 or B56) regulatory subunit. ST has a lower binding affinity than B' for the PP2A core enzyme. Consequently, ST does not efficiently displace B' from PP2A holoenzymes in vitro. Notably, ST inhibits PP2A phosphatase activity through its N-terminal J domain. These findings suggest that ST may function mainly by inhibiting the phosphatase activity of the PP2A core enzyme, and to a lesser extent by modulating assembly of the PP2A holoenzymes.
__TOC__
 
</StructureSection>
==About this Structure==
2PKG is a [[Protein complex]] structure of sequences from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] and [http://en.wikipedia.org/wiki/Simian_virus_40 Simian virus 40]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2PKG OCA].
 
==Reference==
Structural and biochemical insights into the regulation of protein phosphatase 2A by small t antigen of SV40., Chen Y, Xu Y, Bao Q, Xing Y, Li Z, Lin Z, Stock JB, Jeffrey PD, Shi Y, Nat Struct Mol Biol. 2007 Jun;14(6):527-34. Epub 2007 May 27. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/17529992 17529992]
[[Category: Homo sapiens]]
[[Category: Homo sapiens]]
[[Category: Protein complex]]
[[Category: Large Structures]]
[[Category: Simian virus 40]]
[[Category: Macaca mulatta polyomavirus 1]]
[[Category: Jeffrey, P D.]]
[[Category: Jeffrey PD]]
[[Category: Shi, Y.]]
[[Category: Shi Y]]
[[Category: ZN]]
[[Category: protein phosphatase 2a]]
[[Category: regulation]]
[[Category: small t antigen]]
[[Category: sv40]]
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 18:14:06 2008''
Retrieved from "https://proteopedia.org/2pkg"