4esv: Difference between revisions
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==A New Twist on the Translocation Mechanism of Helicases from the Structure of DnaB with its Substrates== | ==A New Twist on the Translocation Mechanism of Helicases from the Structure of DnaB with its Substrates== | ||
<StructureSection load='4esv' size='340' side='right' caption='[[4esv]], [[Resolution|resolution]] 3.20Å' scene=''> | <StructureSection load='4esv' size='340' side='right'caption='[[4esv]], [[Resolution|resolution]] 3.20Å' scene=''> | ||
== Structural highlights == | == Structural highlights == | ||
<table><tr><td colspan='2'>[[4esv]] is a 14 chain structure with sequence from [ | <table><tr><td colspan='2'>[[4esv]] is a 14 chain structure with sequence from [https://en.wikipedia.org/wiki/Geobacillus_stearothermophilus Geobacillus stearothermophilus] and [https://en.wikipedia.org/wiki/Synthetic_construct Synthetic construct]. The December 2013 RCSB PDB [https://pdb.rcsb.org/pdb/static.do?p=education_discussion/molecule_of_the_month/index.html Molecule of the Month] feature on ''DNA Helicase'' by David Goodsell is [https://dx.doi.org/10.2210/rcsb_pdb/mom_2013_12 10.2210/rcsb_pdb/mom_2013_12]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4ESV OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4ESV FirstGlance]. <br> | ||
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=ALF:TETRAFLUOROALUMINATE+ION'>ALF</scene>, <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=GDP:GUANOSINE-5-DIPHOSPHATE'>GDP</scene>, <scene name='pdbligand=MES:2-(N-MORPHOLINO)-ETHANESULFONIC+ACID'>MES</scene | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 3.2Å</td></tr> | ||
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ALF:TETRAFLUOROALUMINATE+ION'>ALF</scene>, <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=GDP:GUANOSINE-5-DIPHOSPHATE'>GDP</scene>, <scene name='pdbligand=MES:2-(N-MORPHOLINO)-ETHANESULFONIC+ACID'>MES</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=4esv FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4esv OCA], [https://pdbe.org/4esv PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4esv RCSB], [https://www.ebi.ac.uk/pdbsum/4esv PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4esv ProSAT]</span></td></tr> | |||
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[ | |||
</table> | </table> | ||
== Function == | |||
[https://www.uniprot.org/uniprot/DNAB_GEOSE DNAB_GEOSE] The main replicative DNA helicase, it participates in initiation and elongation during chromosome replication. Travels ahead of the DNA replisome, separating double-stranded (ds)DNA into templates for DNA synthesis. Binding of single-stranded (ss)DNA to the hexamer suggests a 2-nucleotide step size for the helicase and a hand-over-hand mechanism of DNA unwinding (Probable) (PubMed:23022319). Has ssDNA-stimulated ATPase activity (PubMed:10625492). DnaG primase stimulates the helicase activity (the helicase direction was not determine but is probably 5'-3') (PubMed:10625492, PubMed:12235389, PubMed:23022319). Loaded onto DNA by helicase loader DnaI (shown with DnaI of B.subtilis); ATP-binding enhances loading and subsequent ATP hydrolysis dissociates the complex, leaving helicase on the DNA (PubMed:17003052). Binds ssDNA and less well dsDNA, in the presence of ADPNP (probably 5'-adenylyl beta, gamma-imidodiphosphate, but not ATP) binding to both DNAs is improved (PubMed:12235389, PubMed:17003052).<ref>PMID:10625492</ref> <ref>PMID:12235389</ref> <ref>PMID:17003052</ref> <ref>PMID:23022319</ref> | |||
<div style="background-color:#fffaf0;"> | <div style="background-color:#fffaf0;"> | ||
== Publication Abstract from PubMed == | == Publication Abstract from PubMed == | ||
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | ||
</div> | </div> | ||
<div class="pdbe-citations 4esv" style="background-color:#fffaf0;"></div> | |||
==See Also== | |||
*[[Helicase 3D structures|Helicase 3D structures]] | |||
== References == | == References == | ||
<references/> | <references/> | ||
__TOC__ | __TOC__ | ||
</StructureSection> | </StructureSection> | ||
[[Category: DNA | [[Category: DNA Helicase]] | ||
[[Category: Geobacillus stearothermophilus]] | [[Category: Geobacillus stearothermophilus]] | ||
[[Category: | [[Category: Large Structures]] | ||
[[Category: | [[Category: RCSB PDB Molecule of the Month]] | ||
[[Category: | [[Category: Synthetic construct]] | ||
[[Category: | [[Category: Eliason WK]] | ||
[[Category: | [[Category: Itsathitphaisarn O]] | ||
[[Category: | [[Category: Steitz TA]] | ||
[[Category: | [[Category: Wang J]] | ||
[[Category: | [[Category: Wing RA]] | ||
Latest revision as of 10:52, 13 August 2026
A New Twist on the Translocation Mechanism of Helicases from the Structure of DnaB with its Substrates
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