6n7w

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'''Unreleased structure'''
 
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The entry 6n7w is ON HOLD
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==Structure of bacteriophage T7 leading-strand DNA polymerase (D5A/E7A)/Trx in complex with a DNA fork and incoming dTTP (from multiple lead complexes)==
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<StructureSection load='6n7w' size='340' side='right' caption='[[6n7w]], [[Resolution|resolution]] 4.50&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[6n7w]] is a 4 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6N7W OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6N7W FirstGlance]. <br>
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</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=TTP:THYMIDINE-5-TRIPHOSPHATE'>TTP</scene></td></tr>
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<tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=2DA:2,3-DIDEOXYADENOSINE-5-MONOPHOSPHATE'>2DA</scene></td></tr>
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6n7w FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6n7w OCA], [http://pdbe.org/6n7w PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6n7w RCSB], [http://www.ebi.ac.uk/pdbsum/6n7w PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6n7w ProSAT]</span></td></tr>
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</table>
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== Function ==
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[[http://www.uniprot.org/uniprot/DPOL_BPT7 DPOL_BPT7]] Replicates viral genomic DNA. Non-processive DNA polymerase that achieves processivity by binding to host thioredoxin (TrxA). This interaction increases the rate of dNTP incorporation to yield a processivity of approximately 800 nucleotides (nt) per binding event. Interacts with DNA helicase gp4 to coordinate nucleotide polymerization with unwinding of the DNA. The leading strand is synthesized continuously while synthesis of the lagging strand requires the synthesis of oligoribonucleotides by the primase domain of gp4.<ref>PMID:9218486</ref> <ref>PMID:21606333</ref>
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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
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Visualization in atomic detail of the replisome that performs concerted leading- and lagging-DNA strand synthesis at a replication fork has not been reported. Using bacteriophage T7 as a model system, we determined cryo-electron microscopy structures up to 3.2-angstroms resolution of helicase translocating along DNA and of helicase-polymerase-primase complexes engaging in synthesis of both DNA strands. Each domain of the spiral-shaped hexameric helicase translocates sequentially hand-over-hand along a single-stranded DNA coil, akin to the way AAA+ ATPases (adenosine triphosphatases) unfold peptides. Two lagging-strand polymerases are attached to the primase, ready for Okazaki fragment synthesis in tandem. A beta hairpin from the leading-strand polymerase separates two parental DNA strands into a T-shaped fork, thus enabling the closely coupled helicase to advance perpendicular to the downstream DNA duplex. These structures reveal the molecular organization and operating principles of a replisome.
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Authors: Gao, Y., Fox, T., Val, N., Yang, W.
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Structures and operating principles of the replisome.,Gao Y, Cui Y, Fox T, Lin S, Wang H, de Val N, Zhou ZH, Yang W Science. 2019 Feb 22;363(6429). pii: science.aav7003. doi:, 10.1126/science.aav7003. Epub 2019 Jan 24. PMID:30679383<ref>PMID:30679383</ref>
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Description: Structure of bacteriophage T7 leading-strand DNA polymerase (D5A/E7A)/Trx and gp4 in complex with a DNA fork and incoming dTTP (from gp4-gp5 leading-strand complex)
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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[[Category: Unreleased Structures]]
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</div>
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<div class="pdbe-citations 6n7w" style="background-color:#fffaf0;"></div>
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== References ==
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<references/>
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__TOC__
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</StructureSection>
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[[Category: Fox, T]]
[[Category: Gao, Y]]
[[Category: Gao, Y]]
[[Category: Val, N]]
[[Category: Val, N]]
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[[Category: Fox, T]]
 
[[Category: Yang, W]]
[[Category: Yang, W]]
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[[Category: Dna polymerase]]
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[[Category: Dna replication]]
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[[Category: Helicase]]
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[[Category: Replisome]]
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[[Category: Transferase-dna complex]]

Revision as of 07:34, 6 March 2019

Structure of bacteriophage T7 leading-strand DNA polymerase (D5A/E7A)/Trx in complex with a DNA fork and incoming dTTP (from multiple lead complexes)

6n7w, resolution 4.50Å

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