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== Structural highlights ==
== Structural highlights ==
<table><tr><td colspan='2'>[[4qw9]] is a 3 chain structure with sequence from [https://en.wikipedia.org/wiki/Saccharolobus_solfataricus_P2 Saccharolobus solfataricus P2]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4QW9 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4QW9 FirstGlance]. <br>
<table><tr><td colspan='2'>[[4qw9]] is a 3 chain structure with sequence from [https://en.wikipedia.org/wiki/Saccharolobus_solfataricus_P2 Saccharolobus solfataricus P2]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4QW9 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4QW9 FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=0G4:[[[[(2R,5S)-5-(4-AZANYL-5-FLUORANYL-2-OXIDANYLIDENE-PYRIMIDIN-1-YL)-1,3-OXATHIOLAN-2-YL]METHOXY-OXIDANYL-PHOSPHORYL]OXY-OXIDANYL-PHOSPHORYL]AMINO]PHOSPHONIC+ACID'>0G4</scene>, <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene></td></tr>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.4&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=0G4:[[[[(2R,5S)-5-(4-AZANYL-5-FLUORANYL-2-OXIDANYLIDENE-PYRIMIDIN-1-YL)-1,3-OXATHIOLAN-2-YL]METHOXY-OXIDANYL-PHOSPHORYL]OXY-OXIDANYL-PHOSPHORYL]AMINO]PHOSPHONIC+ACID'>0G4</scene>, <scene name='pdbligand=CA:CALCIUM+ION'>CA</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=4qw9 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4qw9 OCA], [https://pdbe.org/4qw9 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4qw9 RCSB], [https://www.ebi.ac.uk/pdbsum/4qw9 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4qw9 ProSAT]</span></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=4qw9 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4qw9 OCA], [https://pdbe.org/4qw9 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4qw9 RCSB], [https://www.ebi.ac.uk/pdbsum/4qw9 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4qw9 ProSAT]</span></td></tr>
</table>
</table>
== Function ==
== Function ==
[https://www.uniprot.org/uniprot/DPO4_SACS2 DPO4_SACS2] Poorly processive, error-prone DNA polymerase involved in untargeted mutagenesis. Copies undamaged DNA at stalled replication forks, which arise in vivo from mismatched or misaligned primer ends. These misaligned primers can be extended by PolIV. Exhibits no 3'-5' exonuclease (proofreading) activity. It is involved in translesional synthesis.
[https://www.uniprot.org/uniprot/DPO4_SACS2 DPO4_SACS2] Poorly processive, error-prone DNA polymerase involved in untargeted mutagenesis. Copies undamaged DNA at stalled replication forks, which arise in vivo from mismatched or misaligned primer ends. These misaligned primers can be extended by PolIV. Exhibits no 3'-5' exonuclease (proofreading) activity. It is involved in translesional synthesis.
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Considering that all natural nucleotides (D-dNTPs) and the building blocks (D-dNMPs) of DNA chains possess D-stereochemistry, DNA polymerases and reverse transcriptases (RTs) likely possess strongD-stereoselectivity by preferably binding and incorporating D-dNTPs over unnatural L-dNTPs during DNA synthesis. Surprisingly, a structural basis for the discrimination against L-dNTPs by DNA polymerases or RTs has not been established although L-deoxycytidine analogs (lamivudine and emtricitabine) and L-thymidine (telbivudine) have been widely used as antiviral drugs for years. Here we report seven high-resolution ternary crystal structures of a prototype Y-family DNA polymerase, DNA, and D-dCTP, D-dCDP, L-dCDP, or the diphosphates and triphosphates of lamivudine and emtricitabine. These structures reveal that relative to D-dCTP, each of these L-nucleotides has its sugar ring rotated by 180 degrees with an unusual O4'-endo sugar puckering and exhibits multiple triphosphate-binding conformations within the active site of the polymerase. Such rare binding modes significantly decrease the incorporation rates and efficiencies of these L-nucleotides catalyzed by the polymerase.
Structural and kinetic insights into binding and incorporation of L-nucleotide analogs by a Y-family DNA polymerase.,Gaur V, Vyas R, Fowler JD, Efthimiopoulos G, Feng JY, Suo Z Nucleic Acids Res. 2014 Aug 7. pii: gku709. PMID:25104018<ref>PMID:25104018</ref>
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 4qw9" style="background-color:#fffaf0;"></div>


==See Also==
==See Also==
*[[DNA polymerase 3D structures|DNA polymerase 3D structures]]
*[[DNA polymerase 3D structures|DNA polymerase 3D structures]]
== References ==
<references/>
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</StructureSection>
</StructureSection>

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