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==The structural basis for substrate recognition by mammalian polynucleotide kinase 3' phosphatase==
<StructureSection load='3zvn' size='340' side='right'caption='[[3zvn]], [[Resolution|resolution]] 2.15&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3zvn]] is a 6 chain structure with sequence from [https://en.wikipedia.org/wiki/Mus_musculus Mus musculus] and [https://en.wikipedia.org/wiki/Synthetic_construct Synthetic construct]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3ZVN OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3ZVN 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]] 2.15&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ADP:ADENOSINE-5-DIPHOSPHATE'>ADP</scene>, <scene name='pdbligand=CSX:S-OXY+CYSTEINE'>CSX</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=MN:MANGANESE+(II)+ION'>MN</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=3zvn FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3zvn OCA], [https://pdbe.org/3zvn PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3zvn RCSB], [https://www.ebi.ac.uk/pdbsum/3zvn PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3zvn ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/PNKP_MOUSE PNKP_MOUSE] Plays a key role in the repair of DNA damage, functioning as part of both the non-homologous end-joining (NHEJ) and base excision repair (BER) pathways. Through its two catalytic activities, PNK ensures that DNA termini are compatible with extension and ligation by either removing 3'-phosphates from, or by phosphorylating 5'-hydroxyl groups on, the ribose sugar of the DNA backbone.
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Mammalian polynucleotide kinase 3' phosphatase (PNK) plays a key role in the repair of DNA damage, functioning as part of both the nonhomologous end-joining (NHEJ) and base excision repair (BER) pathways. Through its two catalytic activities, PNK ensures that DNA termini are compatible with extension and ligation by either removing 3'-phosphates from, or by phosphorylating 5'-hydroxyl groups on, the ribose sugar of the DNA backbone. We have now determined crystal structures of murine PNK with DNA molecules bound to both of its active sites. The structure of ssDNA engaged with the 3'-phosphatase domain suggests a mechanism of substrate interaction that assists DNA end seeking. The structure of dsDNA bound to the 5'-kinase domain reveals a mechanism of DNA bending that facilitates recognition of DNA ends in the context of single-strand and double-strand breaks and suggests a close functional cooperation in substrate recognition between the kinase and phosphatase active sites.

The structural basis for substrate recognition by Mammalian polynucleotide kinase 3' phosphatase.,Garces F, Pearl LH, Oliver AW Mol Cell. 2011 Nov 4;44(3):385-96. PMID:22055185<ref>PMID:22055185</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 3zvn" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Mus musculus]]
[[Category: Synthetic construct]]
[[Category: Garces F]]
[[Category: Oliver AW]]
[[Category: Pearl LH]]