View source for 8ia0


==Cryo-EM structure of a Chaetomium thermophilum pre-60S ribosomal subunit - State Puf6==
<StructureSection load='8ia0' size='340' side='right'caption='[[8ia0]], [[Resolution|resolution]] 2.70&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[8ia0]] is a 11 chain structure with sequence from [https://en.wikipedia.org/wiki/Chaetomium_thermophilum_var._thermophilum_DSM_1495 Chaetomium thermophilum var. thermophilum DSM 1495]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=8IA0 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=8IA0 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]] 2.7&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ADP:ADENOSINE-5-DIPHOSPHATE'>ADP</scene>, <scene name='pdbligand=GTP:GUANOSINE-5-TRIPHOSPHATE'>GTP</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=SEP:PHOSPHOSERINE'>SEP</scene>, <scene name='pdbligand=TPO:PHOSPHOTHREONINE'>TPO</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</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=8ia0 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=8ia0 OCA], [https://pdbe.org/8ia0 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=8ia0 RCSB], [https://www.ebi.ac.uk/pdbsum/8ia0 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=8ia0 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/YTM1_CHATD YTM1_CHATD] Component of the NOP7 complex, which is required for maturation of the 25S and 5.8S ribosomal RNAs and formation of the 60S ribosome.[HAMAP-Rule:MF_03029]
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== Publication Abstract from PubMed ==
Ribosome biogenesis proceeds along a multifaceted pathway from the nucleolus to the cytoplasm that is extensively coupled to several quality control mechanisms. However, the mode by which 5S ribosomal RNA is incorporated into the developing pre-60S ribosome, which in humans links ribosome biogenesis to cell proliferation by surveillance by factors such as p53-MDM2, is poorly understood. Here, we report nine nucleolar pre-60S cryo-EM structures from Chaetomium thermophilum, one of which clarifies the mechanism of 5S RNP incorporation into the early pre-60S. Successive assembly states then represent how helicases Dbp10 and Spb4, and the Pumilio domain factor Puf6 act in series to surveil the gradual folding of the nearby 25S rRNA domain IV. Finally, the methyltransferase Spb1 methylates a universally conserved guanine nucleotide in the A-loop of the peptidyl transferase center, thereby licensing further maturation. Our findings provide insight into the hierarchical action of helicases in safeguarding rRNA tertiary structure folding and coupling to surveillance mechanisms that culminate in local RNA modification.

Mechanism of 5S RNP recruitment and helicase-surveilled rRNA maturation during pre-60S biogenesis.,Lau B, Huang Z, Kellner N, Niu S, Berninghausen O, Beckmann R, Hurt E, Cheng J EMBO Rep. 2023 Jul 5;24(7):e56910. doi: 10.15252/embr.202356910. Epub 2023 May 2. PMID:37129998<ref>PMID:37129998</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 8ia0" style="background-color:#fffaf0;"></div>

==See Also==
*[[Ribosome 3D structures|Ribosome 3D structures]]
*[[Ribosome biogenesis protein 3D structures|Ribosome biogenesis protein 3D structures]]
== References ==
<references/>
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</StructureSection>
[[Category: Chaetomium thermophilum var. thermophilum DSM 1495]]
[[Category: Large Structures]]
[[Category: Beckmann R]]
[[Category: Cheng J]]
[[Category: Huang Z]]
[[Category: Hurt E]]
[[Category: Lau B]]