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8b9c

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'''Unreleased structure'''
 
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The entry 8b9c is ON HOLD
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==S. cerevisiae pol alpha - replisome complex==
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<StructureSection load='8b9c' size='340' side='right'caption='[[8b9c]], [[Resolution|resolution]] 4.60&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[8b9c]] is a 10 chain structure with sequence from [https://en.wikipedia.org/wiki/Saccharomyces_cerevisiae Saccharomyces cerevisiae]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=8B9C OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=8B9C 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">Electron Microscopy, [[Resolution|Resolution]] 4.6&#8491;</td></tr>
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ANP:PHOSPHOAMINOPHOSPHONIC+ACID-ADENYLATE+ESTER'>ANP</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></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=8b9c FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=8b9c OCA], [https://pdbe.org/8b9c PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=8b9c RCSB], [https://www.ebi.ac.uk/pdbsum/8b9c PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=8b9c ProSAT]</span></td></tr>
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/MCM2_YEAST MCM2_YEAST] Acts as component of the MCM2-7 complex (MCM complex) which is the putative replicative helicase essential for 'once per cell cycle' DNA replication initiation and elongation in eukaryotic cells. The active ATPase sites in the MCM2-7 ring are formed through the interaction surfaces of two neighboring subunits such that a critical structure of a conserved arginine finger motif is provided in trans relative to the ATP-binding site of the Walker A box of the adjacent subunit. The six ATPase active sites, however, are likely to contribute differentially to the complex helicase activity; specifically the MCM2-MCM5 association is proposed to be reversible and to mediate a open ring conformation which may facilitate DNA loading. Once loaded onto DNA, double hexamers can slide on dsDNA in the absence of ATPase activity. Necessary for cell growth.<ref>PMID:19896182</ref> <ref>PMID:19910535</ref>
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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
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During eukaryotic DNA replication, Pol alpha-primase generates primers at replication origins to start leading-strand synthesis and every few hundred nucleotides during discontinuous lagging-strand replication. How Pol alpha-primase is targeted to replication forks to prime DNA synthesis is not fully understood. Here, by determining cryoelectron microscopy (cryo-EM) structures of budding yeast and human replisomes containing Pol alpha-primase, we reveal a conserved mechanism for the coordination of priming by the replisome. Pol alpha-primase binds directly to the leading edge of the CMG (CDC45-MCM-GINS) replicative helicase via a complex interaction network. The non-catalytic PRIM2/Pri2 subunit forms two interfaces with CMG that are critical for in vitro DNA replication and yeast cell growth. These interactions position the primase catalytic subunit PRIM1/Pri1 directly above the exit channel for lagging-strand template single-stranded DNA (ssDNA), revealing why priming occurs efficiently only on the lagging-strand template and elucidating a mechanism for Pol alpha-primase to overcome competition from RPA to initiate primer synthesis.
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Authors:
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How Pol alpha-primase is targeted to replisomes to prime eukaryotic DNA replication.,Jones ML, Aria V, Baris Y, Yeeles JTP Mol Cell. 2023 Jul 27:S1097-2765(23)00511-7. doi: 10.1016/j.molcel.2023.06.035. PMID:37506699<ref>PMID:37506699</ref>
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Description:
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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 8b9c" 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: Large Structures]]
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[[Category: Saccharomyces cerevisiae]]
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[[Category: Jones ML]]
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[[Category: Yeeles JTP]]

Current revision

S. cerevisiae pol alpha - replisome complex

PDB ID 8b9c

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