2nqh: Difference between revisions

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-[[Image:2nqh.png|left|200px]]
-{{STRUCTURE_2nqh|  PDB=2nqh  |  SCENE=  }}
+==High Resolution crystal structure of Escherichia coli endonuclease IV (Endo IV) E261Q mutant==
+<StructureSection load='2nqh' size='340' side='right'caption='[[2nqh]], [[Resolution|resolution]] 1.10&Aring;' scene=''>
+== Structural highlights ==
+<table><tr><td colspan='2'>[[2nqh]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2NQH OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2NQH 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]] 1.1&#8491;</td></tr>
+<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</scene>, <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=2nqh FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2nqh OCA], [https://pdbe.org/2nqh PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2nqh RCSB], [https://www.ebi.ac.uk/pdbsum/2nqh PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2nqh ProSAT]</span></td></tr>
+</table>
+== Function ==
+[https://www.uniprot.org/uniprot/END4_ECOLI END4_ECOLI] Endonuclease IV plays a role in DNA repair. It cleaves phosphodiester bonds at apurinic or apyrimidinic sites (AP sites) to produce new 5'-ends that are base-free deoxyribose 5-phosphate residues. It preferentially attacks modified AP sites created by bleomycin and neocarzinostatin.
+== 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/nq/2nqh_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=2nqh ConSurf].
+<div style="clear:both"></div>
+<div style="background-color:#fffaf0;">
+== Publication Abstract from PubMed ==
+Escherichia coli endonuclease IV is an archetype for an abasic or apurinic-apyrimidinic endonuclease superfamily crucial for DNA base excision repair. Here biochemical, mutational and crystallographic characterizations reveal a three-metal ion mechanism for damage binding and incision. The 1.10-A resolution DNA-free and the 2.45-A resolution DNA-substrate complex structures capture substrate stabilization by Arg37 and reveal a distorted Zn3-ligand arrangement that reverts, after catalysis, to an ideal geometry suitable to hold rather than release cleaved DNA product. The 1.45-A resolution DNA-product complex structure shows how Tyr72 caps the active site, tunes its dielectric environment and promotes catalysis by Glu261-activated hydroxide, bound to two Zn2+ ions throughout catalysis. These structural, mutagenesis and biochemical results suggest general requirements for abasic site removal in contrast to features specific to the distinct endonuclease IV alpha-beta triose phosphate isomerase (TIM) barrel and APE1 four-layer alpha-beta folds of the apurinic-apyrimidinic endonuclease families.
-===High Resolution crystal structure of Escherichia coli endonuclease IV (Endo IV) E261Q mutant===
+DNA apurinic-apyrimidinic site binding and excision by endonuclease IV.,Garcin ED, Hosfield DJ, Desai SA, Haas BJ, Bjoras M, Cunningham RP, Tainer JA Nat Struct Mol Biol. 2008 May;15(5):515-22. Epub 2008 Apr 13. PMID:18408731<ref>PMID:18408731</ref>
-{{ABSTRACT_PUBMED_18408731}}
+From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
+</div>
-==About this Structure==
+<div class="pdbe-citations 2nqh" style="background-color:#fffaf0;"></div>
-[[2nqh]] is a 1 chain structure of [[Endonuclease]] with sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2NQH OCA].
 ==See Also==
-*[[Endonuclease|Endonuclease]]
+*[[Apurinic/apyrimidinic endonuclease 3D structures|Apurinic/apyrimidinic endonuclease 3D structures]]
+*[[Endonuclease 3D structures|Endonuclease 3D structures]]
-==Reference==
+== References ==
-<ref group="xtra">PMID:018408731</ref><references group="xtra"/>
+<references/>
+__TOC__
+</StructureSection>
 [[Category: Escherichia coli]]
-[[Category: Garcin-Hosfield, E D.]]
+[[Category: Large Structures]]
-[[Category: Hosfield, D J.]]
+[[Category: Garcin-Hosfield ED]]
-[[Category: Tainer, J A.]]
+[[Category: Hosfield DJ]]
-[[Category: Hydrolase]]
+[[Category: Tainer JA]]
-[[Category: Tim-barrel]]
-[[Category: Trinuclear zinc center]]