View source for 8zpk


==Cryo-EM structure of origin recognition complex (Orc6 with residues 1 to 270 deleted) with ARS1 DNA bound==
<StructureSection load='8zpk' size='340' side='right'caption='[[8zpk]], [[Resolution|resolution]] 3.21&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[8zpk]] is a 8 chain structure with sequence from [https://en.wikipedia.org/wiki/Saccharomyces_cerevisiae Saccharomyces cerevisiae] and [https://en.wikipedia.org/wiki/Saccharomyces_cerevisiae_S288C Saccharomyces cerevisiae S288C]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=8ZPK OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=8ZPK FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Electron Microscopy, [[Resolution|Resolution]] 3.21&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=AGS:PHOSPHOTHIOPHOSPHORIC+ACID-ADENYLATE+ESTER'>AGS</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</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=8zpk FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=8zpk OCA], [https://pdbe.org/8zpk PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=8zpk RCSB], [https://www.ebi.ac.uk/pdbsum/8zpk PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=8zpk ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/ORC4_YEAST ORC4_YEAST] Component of the origin recognition complex (ORC) that binds origins of replication. It has a role in both chromosomal replication and mating type transcriptional silencing. Binds to the ARS consensus sequence (ACS) of origins of replication.
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
In eukaryotes, the origin recognition complex (ORC) promotes the assembly of minichromosome maintenance 2 to 7 complexes into a head-to-head double hexamer at origin DNA in a process known as replication licensing. In this study, we present a series of cryoelectron microscopy structures of yeast ORC mutants in complex with origin DNA. We show that Orc6, the smallest subunit of ORC, utilizes its transcription factor II B-B domain to orchestrate the sequential binding of ORC to origin DNA. In addition, Orc6 plays the role of a scaffold by stabilizing the basic patch (BP) of Orc5 for ORC to capture and bend origin DNA. Importantly, disrupting DNA bending through mutating three key residues in Orc5-BP impairs ORC's ability to promote replication initiation at two points during the pre-RC assembly process. This study dissects the multifaceted role of Orc6 in orchestrating ORC's activities on DNA and underscores the vital role of DNA bending by ORC in replication licensing.

DNA bending mediated by ORC is essential for replication licensing in budding yeast.,Lam WH, Yu D, Zhang Q, Lin Y, Li N, Li J, Wu Y, Zhang Y, Gao N, Tye BK, Zhai Y, Dang S Proc Natl Acad Sci U S A. 2025 Apr 8;122(14):e2502277122. doi: , 10.1073/pnas.2502277122. Epub 2025 Apr 4. PMID:40184174<ref>PMID:40184174</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 8zpk" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Saccharomyces cerevisiae]]
[[Category: Saccharomyces cerevisiae S288C]]
[[Category: Dang S]]
[[Category: Lam WH]]
[[Category: Yu D]]
[[Category: Zhai Y]]