View source for 1j53


==Structure of the N-terminal Exonuclease Domain of the Epsilon Subunit of E.coli DNA Polymerase III at pH 8.5==
<StructureSection load='1j53' size='340' side='right'caption='[[1j53]], [[Resolution|resolution]] 1.80&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1j53]] 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=1J53 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1J53 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]] 1.8&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</scene>, <scene name='pdbligand=MN:MANGANESE+(II)+ION'>MN</scene>, <scene name='pdbligand=TMP:THYMIDINE-5-PHOSPHATE'>TMP</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=1j53 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1j53 OCA], [https://pdbe.org/1j53 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1j53 RCSB], [https://www.ebi.ac.uk/pdbsum/1j53 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1j53 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/DPO3E_ECOLI DPO3E_ECOLI] DNA polymerase III is a complex, multichain enzyme responsible for most of the replicative synthesis in bacteria. The epsilon subunit contain the editing function and is a proofreading 3'-5' exonuclease.
== 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/j5/1j53_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.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=1j53 ConSurf].
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<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The epsilon subunit of the Escherichia coli replicative DNA polymerase III is the proofreading 3'-5' exonuclease. Structures of its catalytic N-terminal domain (epsilon186) were determined at two pH values (5.8 and 8.5) at resolutions of 1.7-1.8 A, in complex with two Mn(II) ions and a nucleotide product of its reaction, thymidine 5'-monophosphate. The protein structure is built around a core five-stranded beta sheet that is a common feature of members of the DnaQ superfamily. The structures were identical, except for differences in the way TMP and water molecules are coordinated to the binuclear metal center in the active site. These data are used to develop a mechanism for epsilon and to produce a plausible model of the complex of epsilon186 with DNA.

Structural basis for proofreading during replication of the Escherichia coli chromosome.,Hamdan S, Carr PD, Brown SE, Ollis DL, Dixon NE Structure. 2002 Apr;10(4):535-46. PMID:11937058<ref>PMID:11937058</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 1j53" style="background-color:#fffaf0;"></div>

==See Also==
*[[DNA polymerase 3D structures|DNA polymerase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Escherichia coli]]
[[Category: Large Structures]]
[[Category: Brown SE]]
[[Category: Carr PD]]
[[Category: Dixon NE]]
[[Category: Hamdan S]]
[[Category: Ollis DL]]