View source for 8bf7


==Elongating E. coli 70S ribosome containing deacylated tRNA(iMet) in the P-site and AAA mRNA codon with cognate dipeptidyl-tRNA(Lys) in the A-site==
<StructureSection load='8bf7' size='340' side='right'caption='[[8bf7]], [[Resolution|resolution]] 2.33&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[8bf7]] is a 10 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli_K-12 Escherichia coli K-12]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=8BF7 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=8BF7 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]] 2.33&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=4SU:4-THIOURIDINE-5-MONOPHOSPHATE'>4SU</scene>, <scene name='pdbligand=5MU:5-METHYLURIDINE+5-MONOPHOSPHATE'>5MU</scene>, <scene name='pdbligand=FME:N-FORMYLMETHIONINE'>FME</scene>, <scene name='pdbligand=H2U:5,6-DIHYDROURIDINE-5-MONOPHOSPHATE'>H2U</scene>, <scene name='pdbligand=OMC:O2-METHYLYCYTIDINE-5-MONOPHOSPHATE'>OMC</scene>, <scene name='pdbligand=T6A:N-[N-(9-B-D-RIBOFURANOSYLPURIN-6-YL)CARBAMOYL]THREONINE-5-MONOPHOSPHATE'>T6A</scene>, <scene name='pdbligand=U8U:5-METHYLAMINOMETHYL-2-THIOURIDINE-5-MONOPHOSPHATE'>U8U</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=8bf7 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=8bf7 OCA], [https://pdbe.org/8bf7 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=8bf7 RCSB], [https://www.ebi.ac.uk/pdbsum/8bf7 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=8bf7 ProSAT]</span></td></tr>
</table>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
N(6)-methyladenosine (m(6)A) is an abundant, dynamic mRNA modification that regulates key steps of cellular mRNA metabolism. m(6)A in the mRNA coding regions inhibits translation elongation. Here, we show how m(6)A modulates decoding in the bacterial translation system using a combination of rapid kinetics, smFRET and single-particle cryo-EM. We show that, while the modification does not impair the initial binding of aminoacyl-tRNA to the ribosome, in the presence of m(6)A fewer ribosomes complete the decoding process due to the lower stability of the complexes and enhanced tRNA drop-off. The mRNA codon adopts a pi-stacked codon conformation that is remodeled upon aminoacyl-tRNA binding. m(6)A does not exclude canonical codon-anticodon geometry, but favors alternative more dynamic conformations that are rejected by the ribosome. These results highlight how modifications outside the Watson-Crick edge can still interfere with codon-anticodon base pairing and complex recognition by the ribosome, thereby modulating the translational efficiency of modified mRNAs.

Modulation of translational decoding by m(6)A modification of mRNA.,Jain S, Koziej L, Poulis P, Kaczmarczyk I, Gaik M, Rawski M, Ranjan N, Glatt S, Rodnina MV Nat Commun. 2023 Aug 8;14(1):4784. doi: 10.1038/s41467-023-40422-7. PMID:37553384<ref>PMID:37553384</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 8bf7" style="background-color:#fffaf0;"></div>

==See Also==
*[[Ribosome 3D structures|Ribosome 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Escherichia coli K-12]]
[[Category: Large Structures]]
[[Category: Glatt S]]
[[Category: Koziej L]]