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[[Image:1fpz.jpg|left|200px]]<br /><applet load="1fpz" size="350" color="white" frame="true" align="right" spinBox="true"
caption="1fpz, resolution 2.0&Aring;" />
'''CRYSTAL STRUCTURE ANALYSIS OF KINASE ASSOCIATED PHOSPHATASE (KAP) WITH A SUBSTITUTION OF THE CATALYTIC SITE CYSTEINE (CYS140) TO A SERINE'''<br />


==Overview==
==CRYSTAL STRUCTURE ANALYSIS OF KINASE ASSOCIATED PHOSPHATASE (KAP) WITH A SUBSTITUTION OF THE CATALYTIC SITE CYSTEINE (CYS140) TO A SERINE==
The CDK-interacting protein phosphatase KAP dephosphorylates phosphoThr-160 (pThr-160) of the CDK2 activation segment, the site of regulatory phosphorylation that is essential for kinase activity. Here we describe the crystal structure of KAP in association with pThr-160-CDK2, representing an example of a protein phosphatase in complex with its intact protein substrate. The major protein interface between the two molecules is formed by the C-terminal lobe of CDK2 and the C-terminal helix of KAP, regions remote from the kinase-activation segment and the KAP catalytic site. The kinase-activation segment interacts with the catalytic site of KAP almost entirely via the phosphate group of pThr-160. This interaction requires that the activation segment is unfolded and drawn away from the kinase molecule, inducing a conformation of CDK2 similar to the activated state observed in the CDK2/cyclin A complex.
<StructureSection load='1fpz' size='340' side='right'caption='[[1fpz]], [[Resolution|resolution]] 2.00&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1fpz]] is a 6 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1FPZ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1FPZ FirstGlance]. <br>
</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&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=SO4:SULFATE+ION'>SO4</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=1fpz FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1fpz OCA], [https://pdbe.org/1fpz PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1fpz RCSB], [https://www.ebi.ac.uk/pdbsum/1fpz PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1fpz ProSAT]</span></td></tr>
</table>
== Disease ==
[https://www.uniprot.org/uniprot/CDKN3_HUMAN CDKN3_HUMAN] Defects in CDKN3 are found in patients with hepatocellular carcinoma (HCC) [MIM:[https://omim.org/entry/114550 114550].<ref>PMID:10987270</ref>
== Function ==
[https://www.uniprot.org/uniprot/CDKN3_HUMAN CDKN3_HUMAN] May play a role in cell cycle regulation. Dual specificity phosphatase active toward substrates containing either phosphotyrosine or phosphoserine residues. Dephosphorylates CDK2 at 'Thr-160' in a cyclin-dependent manner.<ref>PMID:8242750</ref> <ref>PMID:8127873</ref> <ref>PMID:7569954</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/fp/1fpz_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=1fpz ConSurf].
<div style="clear:both"></div>


==About this Structure==
==See Also==
1FPZ is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] with <scene name='pdbligand=SO4:'>SO4</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Active as [http://en.wikipedia.org/wiki/Protein-tyrosine-phosphatase Protein-tyrosine-phosphatase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.1.3.48 3.1.3.48] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1FPZ OCA].
*[[Cyclin-dependent kinase 3D structures|Cyclin-dependent kinase 3D structures]]
 
== References ==
==Reference==
<references/>
Phosphoprotein-protein interactions revealed by the crystal structure of kinase-associated phosphatase in complex with phosphoCDK2., Song H, Hanlon N, Brown NR, Noble ME, Johnson LN, Barford D, Mol Cell. 2001 Mar;7(3):615-26. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=11463386 11463386]
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Homo sapiens]]
[[Category: Protein-tyrosine-phosphatase]]
[[Category: Large Structures]]
[[Category: Single protein]]
[[Category: Barford D]]
[[Category: Barford, D.]]
[[Category: Brown NR]]
[[Category: Brown, N R.]]
[[Category: Hanlon N]]
[[Category: Hanlon, N.]]
[[Category: Johnson LN]]
[[Category: Johnson, L N.]]
[[Category: Noble MEM]]
[[Category: Noble, M E.M.]]
[[Category: Song H]]
[[Category: Song, H.]]
[[Category: SO4]]
[[Category: alpha-beta sandwich]]
 
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