1q57

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[[Image:1q57.png|left|200px]]
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==The Crystal Structure of the Bifunctional Primase-Helicase of Bacteriophage T7==
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<StructureSection load='1q57' size='340' side='right' caption='[[1q57]], [[Resolution|resolution]] 3.45&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[1q57]] is a 7 chain structure with sequence from [http://en.wikipedia.org/wiki/Enterobacteria_phage_t7 Enterobacteria phage t7]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1Q57 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1Q57 FirstGlance]. <br>
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</td></tr><tr><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1e0j|1e0j]], [[1cr0|1cr0]], [[1nui|1nui]], [[1e0k|1e0k]], [[1cr1|1cr1]], [[1cr2|1cr2]], [[1cr4|1cr4]]</td></tr>
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<tr><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">4 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=10760 Enterobacteria phage T7])</td></tr>
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<tr><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1q57 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1q57 OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1q57 RCSB], [http://www.ebi.ac.uk/pdbsum/1q57 PDBsum]</span></td></tr>
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<table>
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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/q5/1q57_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/chain_selection.php?pdb_ID=2ata ConSurf].
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<div style="clear:both"></div>
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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
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Within minutes after infecting Escherichia coli, bacteriophage T7 synthesizes many copies of its genomic DNA. The lynchpin of the T7 replication system is a bifunctional primase-helicase that unwinds duplex DNA at the replication fork while initiating the synthesis of Okazaki fragments on the lagging strand. We have determined a 3.45 A crystal structure of the T7 primase-helicase that shows an articulated arrangement of the primase and helicase sites. The crystallized primase-helicase is a heptamer with a crown-like shape, reflecting an intimate packing of helicase domains into a ring that is topped with loosely arrayed primase domains. This heptameric isoform can accommodate double-stranded DNA in its central channel, which nicely explains its recently described DNA remodeling activity. The double-jointed structure of the primase-helicase permits a free range of motion for the primase and helicase domains that suggests how the continuous unwinding of DNA at the replication fork can be periodically coupled to Okazaki fragment synthesis.
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{{STRUCTURE_1q57| PDB=1q57 | SCENE= }}
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The crystal structure of the bifunctional primase-helicase of bacteriophage T7.,Toth EA, Li Y, Sawaya MR, Cheng Y, Ellenberger T Mol Cell. 2003 Nov;12(5):1113-23. PMID:14636571<ref>PMID:14636571</ref>
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===The Crystal Structure of the Bifunctional Primase-Helicase of Bacteriophage T7===
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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</div>
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{{ABSTRACT_PUBMED_14636571}}
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==About this Structure==
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[[1q57]] is a 7 chain structure with sequence from [http://en.wikipedia.org/wiki/Enterobacteria_phage_t7 Enterobacteria phage t7]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1Q57 OCA].
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==See Also==
==See Also==
*[[RNA polymerase|RNA polymerase]]
*[[RNA polymerase|RNA polymerase]]
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== References ==
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==Reference==
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<references/>
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<ref group="xtra">PMID:014636571</ref><references group="xtra"/>
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__TOC__
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</StructureSection>
[[Category: Enterobacteria phage t7]]
[[Category: Enterobacteria phage t7]]
[[Category: Cheng, Y.]]
[[Category: Cheng, Y.]]

Revision as of 19:13, 28 September 2014

The Crystal Structure of the Bifunctional Primase-Helicase of Bacteriophage T7

1q57, resolution 3.45Å

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