View source for 7f0d


==Cryo-EM structure of Mycobacterium tuberculosis 50S ribosome subunit bound with clarithromycin==
<StructureSection load='7f0d' size='340' side='right'caption='[[7f0d]], [[Resolution|resolution]] 3.30&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[7f0d]] is a 10 chain structure with sequence from [https://en.wikipedia.org/wiki/Mycobacterium_tuberculosis_H37Ra Mycobacterium tuberculosis H37Ra]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7F0D OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7F0D 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]] 3.3&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CTY:CLARITHROMYCIN'>CTY</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=7f0d FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7f0d OCA], [https://pdbe.org/7f0d PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7f0d RCSB], [https://www.ebi.ac.uk/pdbsum/7f0d PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7f0d ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/RL34_MYCTA RL34_MYCTA] 
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== Publication Abstract from PubMed ==
Tuberculosis (TB) is the leading infectious disease caused by Mycobacterium tuberculosis (Mtb). Clarithromycin (CTY), an analog of erythromycin (ERY), is more potent against multidrug-resistance (MDR) TB. ERY and CTY were previously reported to bind to the nascent polypeptide exit tunnel (NPET) near peptidyl transferase center (PTC), but the only available CTY structure in complex with D. radiodurans (Dra) ribosome could be misinterpreted due to resolution limitation. To date, the mechanism of specificity and efficacy of CTY for Mtb remains elusive since the Mtb ribosome-CTY complex structure is still unknown. Here, we employed new sample preparation methods and solved the Mtb ribosome-CTY complex structure at 3.3A with cryo-EM technique, where the crucial gate site A2062 (E. coli numbering) is located at the CTY binding site within NPET. Two alternative conformations of A2062, a novel syn-conformation as well as a swayed conformation bound with water molecule at interface, may play a role in coordinating the binding of specific drug molecules. The previously overlooked C-H hydrogen bond (H-bond) and pi interaction may collectively contribute to the enhanced binding affinity. Together, our structure data provide a structural basis for the dynamic binding as well as the specificity of CTY and explain of how a single methyl group in CTY improves its potency, which provides new evidence to reveal previously unclear mechanism of translational modulation for future drug design and anti-TB therapy. Furthermore, our sample preparation method may facilitate drug discovery based on the complexes with low water solubility drugs by cryo-EM technique.

Cryo-EM structure of Mycobacterium tuberculosis 50S ribosomal subunit bound with clarithromycin reveals dynamic and specific interactions with macrolides.,Zhang W, Li Z, Sun Y, Cui P, Liang J, Xing Q, Wu J, Xu Y, Zhang W, Zhang Y, He L, Gao N Emerg Microbes Infect. 2022 Dec;11(1):293-305. doi: , 10.1080/22221751.2021.2022439. PMID:34935599<ref>PMID:34935599</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 7f0d" style="background-color:#fffaf0;"></div>

==See Also==
*[[Ribosome 3D structures|Ribosome 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Mycobacterium tuberculosis H37Ra]]
[[Category: Gao N]]
[[Category: Li Z]]
[[Category: Sun Y]]
[[Category: Zhang W]]