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- PDB-8y36: cryo-EM structure of Staphylococcus aureus(ATCC 29213) 50S riboso... -
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Open data
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Basic information
Entry | Database: PDB / ID: 8y36 | ||||||
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Title | cryo-EM structure of Staphylococcus aureus(ATCC 29213) 50S ribosome in complex with MCX-190. | ||||||
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![]() | RIBOSOME / antibiotics | ||||||
Function / homology | ![]() large ribosomal subunit / transferase activity / 5S rRNA binding / large ribosomal subunit rRNA binding / cytosolic large ribosomal subunit / cytoplasmic translation / tRNA binding / rRNA binding / negative regulation of translation / ribosome ...large ribosomal subunit / transferase activity / 5S rRNA binding / large ribosomal subunit rRNA binding / cytosolic large ribosomal subunit / cytoplasmic translation / tRNA binding / rRNA binding / negative regulation of translation / ribosome / structural constituent of ribosome / translation / ribonucleoprotein complex / mRNA binding / cytoplasm Similarity search - Function | ||||||
Biological species | ![]() ![]() | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.65 Å | ||||||
![]() | Li, Y. / Lu, G. / Li, J. / Pei, X. / Lin, J. | ||||||
Funding support | ![]()
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![]() | ![]() Title: Synthetic macrolides overcoming MLSK-resistant pathogens. Authors: Cong-Xuan Ma / Ye Li / Wen-Tian Liu / Yun Li / Fei Zhao / Xiao-Tian Lian / Jing Ding / Si-Meng Liu / Xie-Peng Liu / Bing-Zhi Fan / Li-Yong Liu / Feng Xue / Jian Li / Jue-Ru Zhang / Zhao Xue ...Authors: Cong-Xuan Ma / Ye Li / Wen-Tian Liu / Yun Li / Fei Zhao / Xiao-Tian Lian / Jing Ding / Si-Meng Liu / Xie-Peng Liu / Bing-Zhi Fan / Li-Yong Liu / Feng Xue / Jian Li / Jue-Ru Zhang / Zhao Xue / Xiao-Tong Pei / Jin-Zhong Lin / Jian-Hua Liang / ![]() Abstract: Conventional macrolide-lincosamide-streptogramin B-ketolide (MLSK) antibiotics are unable to counter the growing challenge of antibiotic resistance that is conferred by the constitutive methylation ...Conventional macrolide-lincosamide-streptogramin B-ketolide (MLSK) antibiotics are unable to counter the growing challenge of antibiotic resistance that is conferred by the constitutive methylation of rRNA base A2058 or its G2058 mutation, while the presence of unmodified A2058 is crucial for high selectivity of traditional MLSK in targeting pathogens over human cells. The absence of effective modes of action reinforces the prevailing belief that constitutively antibiotic-resistant Staphylococcus aureus remains impervious to existing macrolides including telithromycin. Here, we report the design and synthesis of a novel series of macrolides, featuring the strategic fusion of ketolide and quinolone moieties. Our effort led to the discovery of two potent compounds, MCX-219 and MCX-190, demonstrating enhanced antibacterial efficacy against a broad spectrum of formidable pathogens, including A2058-methylated Staphylococcus aureus, Streptococcus pneumoniae, Streptococcus pyogenes, and notably, the clinical Mycoplasma pneumoniae isolates harboring A2058G mutations which are implicated in the recent pneumonia outbreak in China. Mechanistic studies reveal that the modified quinolone moiety of MCX-190 establishes a distinctive secondary binding site within the nascent peptide exit tunnel. Structure-activity relationship analysis underscores the importance of this secondary binding, maintained by a sandwich-like π-π stacking interaction and a water-magnesium bridge, for effective engagement with A2058-methylated ribosomes rather than topoisomerases targeted by quinolone antibiotics. Our findings not only highlight MCX-219 and MCX-190 as promising candidates for next-generation MLSK antibiotics to combat antibiotic resistance, but also pave the way for the future rational design of the class of MLSK antibiotics, offering a strategic framework to overcome the challenges posed by escalating antibiotic resistance. | ||||||
History |
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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PDBx/mmCIF format | ![]() | 2.2 MB | Display | ![]() |
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PDB format | ![]() | Display | ![]() | |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
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-Validation report
Arichive directory | ![]() ![]() | HTTPS FTP |
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-Related structure data
Related structure data | ![]() 38873MC ![]() 8y37C ![]() 8y38C ![]() 8y39C M: map data used to model this data C: citing same article ( |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
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Assembly
Deposited unit | ![]()
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1 |
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Components
-RNA chain , 2 types, 2 molecules AB
#1: RNA chain | Mass: 946093.188 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
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#6: RNA chain | Mass: 36974.945 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
+Large ribosomal subunit protein ... , 28 types, 28 molecules 1234CDEFGHIJKLMNOPQRSTUVWXYZ
-Non-polymers , 3 types, 15 molecules ![](data/chem/img/MG.gif)
![](data/chem/img/HOH.gif)
![](data/chem/img/HOH.gif)
#31: Chemical | ChemComp-A1D6G / Mass: 969.124 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C50H72N4O15 | ||
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#32: Chemical | ChemComp-MG / #33: Water | ChemComp-HOH / | |
-Details
Has ligand of interest | Y |
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-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
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Sample preparation
Component | Name: Staphylococcus aureus(ATCC 29213) 50S ribosome in complex with MCX-190. Type: COMPLEX / Entity ID: #1-#30 / Source: NATURAL |
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Source (natural) | Organism: ![]() ![]() |
Buffer solution | pH: 7.4 |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Vitrification | Cryogen name: ETHANE |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: FEI TITAN KRIOS |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD / Nominal defocus max: 1500 nm / Nominal defocus min: 500 nm |
Image recording | Electron dose: 50 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) |
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Processing
CTF correction | Type: NONE |
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3D reconstruction | Resolution: 2.65 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 163945 / Symmetry type: POINT |