View source for 2oyq


==Crystal structure of RB69 gp43 in complex with DNA with 5-NIMP opposite an abasic site analog==
<StructureSection load='2oyq' size='340' side='right'caption='[[2oyq]], [[Resolution|resolution]] 2.86&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[2oyq]] is a 12 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_phage_RB69 Escherichia phage RB69]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2OYQ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2OYQ 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]] 2.86&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=3DR:1,2-DIDEOXYRIBOFURANOSE-5-PHOSPHATE'>3DR</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=N5I:1-(2-DEOXY-5-O-PHOSPHONO-BETA-D-ERYTHRO-PENTOFURANOSYL)-5-NITRO-1H-INDOLE'>N5I</scene>, <scene name='pdbligand=N5P:1-{2-DEOXY-5-O-[(R)-HYDROXY{[(R)-HYDROXY(PHOSPHONOOXY)PHOSPHORYL]OXY}PHOSPHORYL]-BETA-D-ERYTHRO-PENTOFURANOSYL}-5-NITRO-1H-INDOLE'>N5P</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=2oyq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2oyq OCA], [https://pdbe.org/2oyq PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2oyq RCSB], [https://www.ebi.ac.uk/pdbsum/2oyq PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2oyq ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/DPOL_BPR69 DPOL_BPR69] This polymerase possesses two enzymatic activities: DNA synthesis (polymerase) and an exonucleolytic activity that degrades single stranded DNA in the 3'- to 5'-direction.
== 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/oy/2oyq_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=2oyq ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Damage to DNA involving excision of the nucleobase at the N-glycosidic bond forms abasic sites. If a nucleotide becomes incorporated opposite an unrepaired abasic site during DNA synthesis, most B family polymerases obey the A-rule and preferentially incorporate dAMP without instruction from the template. In addition to being potentially mutagenic, abasic sites provide strong blocks to DNA synthesis. A previous crystal structure of an exonuclease deficient variant of the replicative B family DNA polymerase from bacteriophage RB69 (RB69 gp43 exo-) illustrated these properties, showing that the polymerase failed to translocate the DNA following insertion of dAMP opposite an abasic site. We examine four new structures depicting several steps of translesion DNA synthesis by RB69 gp43 exo-, employing a non-natural purine triphosphate analogue, 5-nitro-1-indolyl-2'-deoxyriboside-5'-triphosphate (5-NITP), that is incorporated more efficiently than dAMP opposite abasic sites. Our structures indicate that a dipole-induced dipole stacking interaction between the 5-nitro group and base 3' to the templating lesion explains the enhanced kinetics of 5-NITP. As with dAMP, the DNA fails to translocate following insertion of 5-NIMP, although distortions at the nascent primer terminus contribute less than previously thought in inducing the stall, given that 5-NIMP preserves relatively undistorted geometry at the insertion site following phosphoryl transfer. An open ternary configuration, novel in B family polymerases, reveals an initial template independent binding of 5-NITP adjacent to the active site of the open polymerase, suggesting that closure of the fingers domain shuttles the nucleotide to the active site while testing the substrate against the template.

Caught bending the A-rule: crystal structures of translesion DNA synthesis with a non-natural nucleotide.,Zahn KE, Belrhali H, Wallace SS, Doublie S Biochemistry. 2007 Sep 18;46(37):10551-61. Epub 2007 Aug 24. PMID:17718515<ref>PMID:17718515</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 2oyq" style="background-color:#fffaf0;"></div>

==See Also==
*[[DNA polymerase 3D structures|DNA polymerase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Escherichia phage RB69]]
[[Category: Large Structures]]
[[Category: Belrhali H]]
[[Category: Doublie S]]
[[Category: Wallace SS]]
[[Category: Zahn KE]]