8foc: Difference between revisions

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== Structural highlights ==
== Structural highlights ==
<table><tr><td colspan='2'>[[8foc]] is a 4 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=8FOC OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=8FOC FirstGlance]. <br>
<table><tr><td colspan='2'>[[8foc]] is a 4 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=8FOC OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=8FOC FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=SF4:IRON/SULFUR+CLUSTER'>SF4</scene></td></tr>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Electron Microscopy, [[Resolution|Resolution]] 3.7&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=SF4:IRON/SULFUR+CLUSTER'>SF4</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=8foc FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=8foc OCA], [https://pdbe.org/8foc PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=8foc RCSB], [https://www.ebi.ac.uk/pdbsum/8foc PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=8foc 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=8foc FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=8foc OCA], [https://pdbe.org/8foc PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=8foc RCSB], [https://www.ebi.ac.uk/pdbsum/8foc PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=8foc ProSAT]</span></td></tr>
</table>
</table>
== Function ==
== Function ==
[https://www.uniprot.org/uniprot/A0A8H4BVQ7_YEASX A0A8H4BVQ7_YEASX]  
[https://www.uniprot.org/uniprot/A0A8H4BVQ7_YEASX A0A8H4BVQ7_YEASX]  
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The eukaryotic polymerase alpha (Pol alpha) is a dual-function DNA polymerase/primase complex that synthesizes an RNA-DNA hybrid primer of 20-30 nucleotides for DNA replication. Pol alpha is composed of Pol1, Pol12, Primase 1 (Pri1), and Pri2, with Pol1 and Pri1 containing the DNA polymerase activity and RNA primase activity, respectively, whereas Pol12 and Pri2 serve a structural role. It has been unclear how Pol alpha hands over an RNA primer made by Pri1 to Pol1 for DNA primer extension, and how the primer length is defined, perhaps due to the difficulty in studying the highly mobile structure. Here we report a comprehensive cryo-EM analysis of the intact 4-subunit yeast Pol alpha in the apo, primer initiation, primer elongation, RNA primer hand-off from Pri1 to Pol1, and DNA extension states in a 3.5 A - 5.6 A resolution range. We found that Pol alpha is a three-lobed flexible structure. Pri2 functions as a flexible hinge that holds together the catalytic Pol1-core, and the noncatalytic Pol1 CTD that binds to Pol 12 to form a stable platform upon which the other components are organized. In the apo state, Pol1-core is sequestered on the Pol12-Pol1-CTD platform, and Pri1 is mobile perhaps in search of a template. Upon binding a ssDNA template, a large conformation change is induced that enables Pri1 to perform RNA synthesis, and positions Pol1-core to accept the future RNA primed site 50 A upstream of where Pri1 binds. We reveal in detail the critical point at which Pol1-core takes over the 3'-end of the RNA from Pri1. DNA primer extension appears limited by the spiral motion of Pol1-core while Pri2-CTD stably holds onto the 5' end of the RNA primer. Since both Pri1 and Pol1-core are attached via two linkers to the platform, primer growth will produce stress within this "two-point" attachment that may limit the length of the RNA-DNA hybrid primer. Hence, this study reveals the large and dynamic series of movements that Pol alpha undergoes to synthesize a primer for DNA replication.


Molecular choreography of primer synthesis by the eukaryotic Pol alpha-primase.,Yuan Z, Georgescu R, Li H, O'Donnell ME bioRxiv. 2023 May 3:2023.05.03.539257. doi: 10.1101/2023.05.03.539257. Preprint. PMID:37205351<ref>PMID:37205351</ref>
==See Also==
 
*[[RNA polymerase 3D structures|RNA polymerase 3D structures]]
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 8foc" style="background-color:#fffaf0;"></div>
== References ==
<references/>
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</StructureSection>
</StructureSection>

Latest revision as of 18:01, 13 March 2024

Cryo-EM structure of S. cerevisiae DNA polymerase alpha-primase in Apo state conformation ICryo-EM structure of S. cerevisiae DNA polymerase alpha-primase in Apo state conformation I

Structural highlights

8foc is a 4 chain structure with sequence from Saccharomyces cerevisiae. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:Electron Microscopy, Resolution 3.7Å
Ligands:
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

A0A8H4BVQ7_YEASX

See Also

8foc, resolution 3.70Å

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