View source for 8t8c


==Crystal structure of the Thermus thermophilus 70S ribosome in complex with protein Y, A-site aminoacyl-tRNA analog ACC-PMN, and P-site formyl-MFI-tripeptidyl-tRNA analog ACCA-IFMf at 2.60A resolution==
<StructureSection load='8t8c' size='340' side='right'caption='[[8t8c]], [[Resolution|resolution]] 2.60&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[8t8c]] is a 20 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli], [https://en.wikipedia.org/wiki/Escherichia_coli_K-12 Escherichia coli K-12] and [https://en.wikipedia.org/wiki/Thermus_thermophilus_HB8 Thermus thermophilus HB8]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=8T8C OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=8T8C FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.6&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=0TD:(3S)-3-(METHYLSULFANYL)-L-ASPARTIC+ACID'>0TD</scene>, <scene name='pdbligand=2MA:2-METHYLADENOSINE-5-MONOPHOSPHATE'>2MA</scene>, <scene name='pdbligand=2MG:2N-METHYLGUANOSINE-5-MONOPHOSPHATE'>2MG</scene>, <scene name='pdbligand=2MU:2,5-DIMETHYLURIDINE-5-MONOPHOSPHATE'>2MU</scene>, <scene name='pdbligand=4OC:4N,O2-METHYLCYTIDINE-5-MONOPHOSPHATE'>4OC</scene>, <scene name='pdbligand=5MC:5-METHYLCYTIDINE-5-MONOPHOSPHATE'>5MC</scene>, <scene name='pdbligand=5MU:5-METHYLURIDINE+5-MONOPHOSPHATE'>5MU</scene>, <scene name='pdbligand=8AN:3-AMINO-3-DEOXYADENOSINE+5-(DIHYDROGEN+PHOSPHATE)'>8AN</scene>, <scene name='pdbligand=ARG:ARGININE'>ARG</scene>, <scene name='pdbligand=FME:N-FORMYLMETHIONINE'>FME</scene>, <scene name='pdbligand=G7M:N7-METHYL-GUANOSINE-5-MONOPHOSPHATE'>G7M</scene>, <scene name='pdbligand=M2G:N2-DIMETHYLGUANOSINE-5-MONOPHOSPHATE'>M2G</scene>, <scene name='pdbligand=MA6:6N-DIMETHYLADENOSINE-5-MONOPHOSHATE'>MA6</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=MPD:(4S)-2-METHYL-2,4-PENTANEDIOL'>MPD</scene>, <scene name='pdbligand=OMC:O2-METHYLYCYTIDINE-5-MONOPHOSPHATE'>OMC</scene>, <scene name='pdbligand=OMG:O2-METHYLGUANOSINE-5-MONOPHOSPHATE'>OMG</scene>, <scene name='pdbligand=PPU:PUROMYCIN-5-MONOPHOSPHATE'>PPU</scene>, <scene name='pdbligand=PSU:PSEUDOURIDINE-5-MONOPHOSPHATE'>PSU</scene>, <scene name='pdbligand=UR3:3-METHYLURIDINE-5-MONOPHOSHATE'>UR3</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=8t8c FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=8t8c OCA], [https://pdbe.org/8t8c PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=8t8c RCSB], [https://www.ebi.ac.uk/pdbsum/8t8c PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=8t8c ProSAT]</span></td></tr>
</table>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Hydrolysis-resistant RNA-peptide conjugates that mimic peptidyl-tRNAs are frequently needed for structural and functional studies of protein synthesis in the ribosome. Such conjugates are accessible by chemical solid-phase synthesis, allowing for the utmost flexibility of both the peptide and the RNA sequence. Commonly used protection group strategies, however, have severe limitations with respect to generating the characteristic N(alpha)-formylmethionyl terminus because the formyl group of the conjugate synthesized at the solid support is easily cleaved during the final basic deprotection/release step. In this study, we demonstrate a simple solution to the problem by coupling appropriately activated N(alpha)-formyl methionine to the fully deprotected conjugate. The structural integrity of the obtained N(alpha)-formylmethionyl conjugate horizontal line and hence the chemoselectivity of the reaction horizontal line were verified by Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometry sequence analysis. Additionally, we confirmed the applicability of our procedure for structural studies by obtaining two structures of the ribosome in complex with either fMAI-nh-ACCA or fMFI-nh-ACCA in the P site and ACC-PMN in the A site of the bacterial ribosome at 2.65 and 2.60 A resolution, respectively. In summary, our approach for hydrolysis-resistant N(alpha)-formylated RNA-peptide conjugates is synthetically straightforward and opens up new avenues to explore ribosomal translation with high-precision substrate mimics.

Practical Synthesis of N-Formylmethionylated Peptidyl-tRNA Mimics.,Thaler J, Syroegin EA, Breuker K, Polikanov YS, Micura R ACS Chem Biol. 2023 Oct 20;18(10):2233-2239. doi: 10.1021/acschembio.3c00237. , Epub 2023 Jul 11. PMID:37433044<ref>PMID:37433044</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 8t8c" style="background-color:#fffaf0;"></div>

==See Also==
*[[Ribosomal protein THX 3D structures|Ribosomal protein THX 3D structures]]
*[[Ribosome 3D structures|Ribosome 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Escherichia coli]]
[[Category: Escherichia coli K-12]]
[[Category: Large Structures]]
[[Category: Thermus thermophilus HB8]]
[[Category: Breuker K]]
[[Category: Micura R]]
[[Category: Polikanov YS]]
[[Category: Syroegin EA]]
[[Category: Thaler J]]