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1dk2

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[[Image:1dk2.jpg|left|200px]]<br /><applet load="1dk2" size="350" color="white" frame="true" align="right" spinBox="true"
 
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caption="1dk2" />
 
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'''REFINED SOLUTION STRUCTURE OF THE N-TERMINAL DOMAIN OF DNA POLYMERASE BETA'''<br />
 
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==Overview==
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==REFINED SOLUTION STRUCTURE OF THE N-TERMINAL DOMAIN OF DNA POLYMERASE BETA==
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Mammalian DNA polymerase beta functions in the base excision DNA repair pathway filling in short patches (1-5 nt) in damaged DNA and removing deoxyribose 5'-phosphate from the 5'-side of damaged DNA. The backbone dynamics and the refined solution structure of the N-terminal domain of beta-Pol have been characterized in order to establish the potential contribution(s) of backbone motion to the DNA binding and deoxyribose 5'-phosphate lyase function of this domain. The N-terminal domain is formed from four helices packed as two antiparallel pairs with a 60 degrees crossing between the pairs. The RMSD of the NMR conformers (residues 13-80) is 0.37 A for the backbone heavy atoms and 0.78 A for all heavy atoms. NMR characterization of the binding site(s) for a ssDNA-5mer, ssDNA-8mer, ssDNA-9mer, and dsDNA-12mer shows a consensus surface for the binding of these various DNA oligomers, that surrounds and includes the deoxyribose 5'-phosphate lyase active site region. Connection segments between helices 1 and 2 and between helices 3 and 4 each contribute to DNA binding. Helix-3-turn-helix-4 forms a helix-hairpin-helix motif. The highly conserved hairpin sequence (LPGVG) displays a significant degree of picosecond time-scale motion within the backbone, that is possibly important for DNA binding at the phosphodiester backbone. An Omega-loop connecting helices 1 and 2 and helix-2 itself display significant exchange contributions (R(ex)) at the backbone amides due to apparent conformational type motion on a millisecond time-scale. This motion is likely important in allowing the Omega-loop and helix-2 to shift toward, and productively interact with, gapped DNA. The deoxyribose 5'-phosphate lyase catalytic residues that include K72 which forms the Schiff's base, Y39 which is postulated to promote proton transfer to the aldehyde, and K35 which assists in phosphate elimination, show highly restricted backbone motion. H34, which apparently participates in detection of the abasic site hole and assists in the opening of the hemiacetal, shows conformational exchange.
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<StructureSection load='1dk2' size='340' side='right'caption='[[1dk2]]' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[1dk2]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Rattus_norvegicus Rattus norvegicus]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1DK2 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1DK2 FirstGlance]. <br>
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Solution NMR</td></tr>
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1dk2 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1dk2 OCA], [https://pdbe.org/1dk2 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1dk2 RCSB], [https://www.ebi.ac.uk/pdbsum/1dk2 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1dk2 ProSAT]</span></td></tr>
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/DPOLB_RAT DPOLB_RAT] Repair polymerase that plays a key role in base-excision repair. Has 5'-deoxyribose-5-phosphate lyase (dRP lyase) activity that removes the 5' sugar phosphate and also acts as a DNA polymerase that adds one nucleotide to the 3' end of the arising single-nucleotide gap. Conducts 'gap-filling' DNA synthesis in a stepwise distributive fashion rather than in a processive fashion as for other DNA polymerases.
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== Evolutionary Conservation ==
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[[Image:Consurf_key_small.gif|200px|right]]
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Check<jmol>
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<jmolCheckbox>
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<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/dk/1dk2_consurf.spt"</scriptWhenChecked>
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<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
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<text>to colour the structure by Evolutionary Conservation</text>
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</jmolCheckbox>
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</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=1dk2 ConSurf].
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<div style="clear:both"></div>
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==About this Structure==
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==See Also==
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1DK2 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Rattus_norvegicus Rattus norvegicus]. Active as [http://en.wikipedia.org/wiki/DNA-directed_DNA_polymerase DNA-directed DNA polymerase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.7.7 2.7.7.7] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1DK2 OCA].
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*[[DNA polymerase 3D structures|DNA polymerase 3D structures]]
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__TOC__
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==Reference==
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</StructureSection>
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Backbone dynamics and refined solution structure of the N-terminal domain of DNA polymerase beta. Correlation with DNA binding and dRP lyase activity., Maciejewski MW, Liu D, Prasad R, Wilson SH, Mullen GP, J Mol Biol. 2000 Feb 11;296(1):229-53. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=10656829 10656829]
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[[Category: Large Structures]]
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[[Category: DNA-directed DNA polymerase]]
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[[Category: Rattus norvegicus]]
[[Category: Rattus norvegicus]]
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[[Category: Single protein]]
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[[Category: Liu D-J]]
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[[Category: Liu, D-J.]]
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[[Category: Maciejewski MW]]
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[[Category: Maciejewski, M W.]]
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[[Category: Mullen GP]]
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[[Category: Mullen, G P.]]
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[[Category: Prasad R]]
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[[Category: Prasad, R.]]
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[[Category: Wilson SH]]
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[[Category: Wilson, S H.]]
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[[Category: deoxyribose 5'-phosphate lyase]]
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[[Category: dna-binding]]
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[[Category: nucleotidyltransferase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 12:17:24 2008''
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Current revision

REFINED SOLUTION STRUCTURE OF THE N-TERMINAL DOMAIN OF DNA POLYMERASE BETA

PDB ID 1dk2

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