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- PDB-8vr4: Structure of Mycobacterium smegmatis 50S ribosomal subunit bound ... -
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Open data
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Basic information
Entry | Database: PDB / ID: 8vr4 | ||||||||||||
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Title | Structure of Mycobacterium smegmatis 50S ribosomal subunit bound to HflX and erythromycin:50S-HflX-A-Ery | ||||||||||||
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![]() | RIBOSOME / ribosome splitting / Mycobacterium smegmatis 50S / HflX / disordered 23S rRNA helices / erythromycin / translation | ||||||||||||
Function / homology | ![]() large ribosomal subunit / transferase activity / ribosome binding / 5S rRNA binding / ribosomal large subunit assembly / large ribosomal subunit rRNA binding / cytosolic large ribosomal subunit / cytoplasmic translation / tRNA binding / negative regulation of translation ...large ribosomal subunit / transferase activity / ribosome binding / 5S rRNA binding / ribosomal large subunit assembly / large ribosomal subunit rRNA binding / cytosolic large ribosomal subunit / cytoplasmic translation / tRNA binding / negative regulation of translation / rRNA binding / ribosome / structural constituent of ribosome / translation / ribonucleoprotein complex / GTPase activity / mRNA binding / GTP binding / metal ion binding / cytoplasm Similarity search - Function | ||||||||||||
Biological species | ![]() | ||||||||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.8 Å | ||||||||||||
![]() | Majumdar, S. / Koripella, R.K. / Sharma, M.R. / Manjari, S.R. / Banavali, N.K. / Agrawal, R.K. | ||||||||||||
Funding support | ![]()
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![]() | ![]() Title: HflX-mediated drug resistance through ribosome splitting and rRNA disordering in mycobacteria. Authors: Soneya Majumdar / Amuliya Kashyap / Ravi K Koripella / Manjuli R Sharma / Kelley Hurst-Hess / Swati R Manjari / Nilesh K Banavali / Pallavi Ghosh / Rajendra K Agrawal / ![]() Abstract: HflX is a highly conserved ribosome-associated GTPase implicated in rescuing stalled ribosomes and mediating antibiotic resistance in several bacteria, including macrolide-lincosamide antibiotic ...HflX is a highly conserved ribosome-associated GTPase implicated in rescuing stalled ribosomes and mediating antibiotic resistance in several bacteria, including macrolide-lincosamide antibiotic resistance in mycobacteria. Mycobacterial HflXs carry a distinct N-terminal extension (NTE) and a small insertion, as compared to their eubacterial homologs. Here, we present several high-resolution cryo-EM structures of mycobacterial HflX in complex with the 70S ribosome and its 50S subunit, with and without antibiotics. These structures reveal a distinct mechanism for HflX-mediated ribosome splitting and antibiotic resistance in mycobacteria. Our findings indicate that the NTE of mycobacterial HflX induces persistent disordering of multiple 23S rRNA helices, facilitating the dissociation of the 70S ribosome and generating an inactive pool of 50S subunits. During this process, HflX undergoes a large conformational change that stabilizes its NTE. Mycobacterial HflX also acts as an anti-association factor by binding to predissociated 50S subunits. Our structures show that a mycobacteria-specific insertion in HflX reaches far into the peptidyl transferase center (PTC), such that it would overlap with the ribosome-bound macrolide antibiotics. However, in the presence of antibiotics, this insertion retracts, adjusts around, and interacts with the antibiotic molecules. These results suggest that mycobacterial HflX is agnostic to antibiotic presence in the PTC. It mediates antibiotic resistance by splitting antibiotic-stalled 70S ribosomes and inactivating the resulting 50S subunits. | ||||||||||||
History |
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 2.1 MB | Display | ![]() |
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PDB format | ![]() | 1.7 MB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Arichive directory | ![]() ![]() | HTTPS FTP |
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-Related structure data
Related structure data | ![]() 43476MC ![]() 8vioC ![]() 8vk0C ![]() 8vk7C ![]() 8vkiC ![]() 8vkwC ![]() 8vpkC ![]() 8vr8C ![]() 8vrlC C: citing same article ( M: map data used to model this data |
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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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Components
+50S Ribosomal Protein ... , 30 types, 30 molecules 23CDEFGHJKLMOPQRSTUVWXYZbcdefg
-Protein , 2 types, 2 molecules 4N
#3: Protein | Mass: 50637.094 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() Gene: hflX, MSMEG_2736 Production host: ![]() ![]() References: UniProt: A0QVY1 |
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#15: Protein | Mass: 15774.240 Da / Num. of mol.: 1 / Source method: isolated from a natural source Source: (natural) ![]() References: UniProt: A0QSD8 |
-RNA chain , 2 types, 2 molecules BA
#4: RNA chain | Mass: 38061.816 Da / Num. of mol.: 1 / Source method: isolated from a natural source Source: (natural) ![]() References: GenBank: 118168627 |
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#34: RNA chain | Mass: 1012140.938 Da / Num. of mol.: 1 / Source method: isolated from a natural source Source: (natural) ![]() References: GenBank: 118168627 |
-Non-polymers , 2 types, 2 molecules 


#35: Chemical | ChemComp-GCP / |
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#36: Chemical | ChemComp-ERY / |
-Details
Has ligand of interest | Y |
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Has protein modification | N |
-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: Mycobacterium smegmatis 50S ribosome bound to HflX-GMPPCP complex and Erythromycin Type: RIBOSOME / Entity ID: #1-#34 / Source: NATURAL | |||||||||||||||||||||||||
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Molecular weight | Experimental value: NO | |||||||||||||||||||||||||
Source (natural) | Organism: ![]() | |||||||||||||||||||||||||
Buffer solution | pH: 7.5 Details: 20 mM HEPES-K at pH 7.5, 30 mM ammonium chloride, 10 mM magnesium chloride, and 5 mM beta-mercaptoethanol | |||||||||||||||||||||||||
Buffer component |
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Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES | |||||||||||||||||||||||||
Specimen support | Grid material: COPPER / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R1.2/1.3 | |||||||||||||||||||||||||
Vitrification | Instrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277.15 K |
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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 magnification: 81000 X / Nominal defocus max: 1600 nm / Nominal defocus min: 1000 nm / Cs: 0.001 mm |
Specimen holder | Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER |
Image recording | Electron dose: 62.87 e/Å2 / Detector mode: COUNTING / Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Num. of grids imaged: 1 / Num. of real images: 12145 |
Image scans | Movie frames/image: 40 / Used frames/image: 1-40 |
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Processing
EM software | Name: PHENIX / Version: 1.20.1_4487: / Category: model refinement | ||||||||||||||||||||||||
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
Particle selection | Num. of particles selected: 1747436 | ||||||||||||||||||||||||
Symmetry | Point symmetry: C1 (asymmetric) | ||||||||||||||||||||||||
3D reconstruction | Resolution: 2.8 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 46709 / Symmetry type: POINT | ||||||||||||||||||||||||
Atomic model building | B value: 31.1 / Protocol: FLEXIBLE FIT / Space: REAL / Target criteria: Cross-correlation coefficient | ||||||||||||||||||||||||
Atomic model building |
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Refine LS restraints |
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