View source for 7r81


==Structure of the translating Neurospora crassa ribosome arrested by cycloheximide==
<StructureSection load='7r81' size='340' side='right'caption='[[7r81]], [[Resolution|resolution]] 2.70&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[7r81]] is a 10 chain structure with sequence from [https://en.wikipedia.org/wiki/Neurospora_crassa Neurospora crassa]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7R81 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7R81 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=3HE:4-{(2R)-2-[(1S,3S,5S)-3,5-DIMETHYL-2-OXOCYCLOHEXYL]-2-HYDROXYETHYL}PIPERIDINE-2,6-DIONE'>3HE</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=SPD:SPERMIDINE'>SPD</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=7r81 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7r81 OCA], [https://pdbe.org/7r81 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7r81 RCSB], [https://www.ebi.ac.uk/pdbsum/7r81 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7r81 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/RSSA_NEUCR RSSA_NEUCR] Component of the ribosome, a large ribonucleoprotein complex responsible for the synthesis of proteins in the cell. The small ribosomal subunit (SSU) binds messenger RNAs (mRNAs) and translates the encoded message by selecting cognate aminoacyl-transfer RNA (tRNA) molecules. The large subunit (LSU) contains the ribosomal catalytic site termed the peptidyl transferase center (PTC), which catalyzes the formation of peptide bonds, thereby polymerizing the amino acids delivered by tRNAs into a polypeptide chain. The nascent polypeptides leave the ribosome through a tunnel in the LSU and interact with protein factors that function in enzymatic processing, targeting, and the membrane insertion of nascent chains at the exit of the ribosomal tunnel. uS2 is required for the assembly and/or stability of the 40S ribosomal subunit. Required for the processing of the 20S rRNA-precursor to mature 18S rRNA in a late step of the maturation of 40S ribosomal subunits.[HAMAP-Rule:MF_03015]<ref>PMID:34815343</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Ribosomes translate RNA into proteins. The protein synthesis inhibitor cycloheximide (CHX) is widely used to inhibit eukaryotic ribosomes engaged in translation elongation. However, the lack of structural data for actively translating polyribosomes stalled by CHX leaves unanswered the question of which elongation step is inhibited. We elucidated CHX's mechanism of action based on the cryo-electron microscopy structure of actively translating Neurospora crassa ribosomes bound with CHX at 2.7-A resolution. The ribosome structure from this filamentous fungus contains clearly resolved ribosomal protein eL28, like higher eukaryotes but unlike budding yeast, which lacks eL28. Despite some differences in overall structures, the ribosomes from Neurospora, yeast, and humans all contain a highly conserved CHX binding site. We also sequenced classic Neurospora CHX-resistant alleles. These mutations, including one at a residue not previously observed to affect CHX resistance in eukaryotes, were in the large subunit proteins uL15 and eL42 that are part of the CHX-binding pocket. In addition to A-site transfer RNA (tRNA), P-site tRNA, messenger RNA, and CHX that are associated with the translating N. crassa ribosome, spermidine is present near the CHX binding site close to the E site on the large subunit. The tRNAs in the peptidyl transferase center are in the A/A site and the P/P site. The nascent peptide is attached to the A-site tRNA and not to the P-site tRNA. The structural and functional data obtained show that CHX arrests the ribosome in the classical PRE translocation state and does not interfere with A-site reactivity.

Structure of the translating Neurospora ribosome arrested by cycloheximide.,Shen L, Su Z, Yang K, Wu C, Becker T, Bell-Pedersen D, Zhang J, Sachs MS Proc Natl Acad Sci U S A. 2021 Nov 30;118(48):e2111862118. doi: , 10.1073/pnas.2111862118. PMID:34815343<ref>PMID:34815343</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 7r81" style="background-color:#fffaf0;"></div>

==See Also==
*[[Ribosome 3D structures|Ribosome 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Neurospora crassa]]
[[Category: Becker T]]
[[Category: Bell-Pedersen D]]
[[Category: Sachs MS]]
[[Category: Shen L]]
[[Category: Su Z]]
[[Category: Wu C]]
[[Category: Yang K]]
[[Category: Zhang J]]