+ Open data
Open data
- Basic information
Basic information
| Entry |  | |||||||||||||||
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| Title | mature 50S subunit | |||||||||||||||
|  Map data | ||||||||||||||||
|  Sample | 
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|  Keywords | ribosome / antimicrobial peptide / RNA / ribosomal protein / PrAMP / proline-rich peptide / antibiotics / 50S / Api137 | |||||||||||||||
| Function / homology |  Function and homology information transcriptional attenuation / endoribonuclease inhibitor activity / positive regulation of ribosome biogenesis / RNA-binding transcription regulator activity / negative regulation of cytoplasmic translation / DnaA-L2 complex / translation repressor activity / negative regulation of DNA-templated DNA replication initiation / mRNA regulatory element binding translation repressor activity / assembly of large subunit precursor of preribosome ...transcriptional attenuation / endoribonuclease inhibitor activity / positive regulation of ribosome biogenesis / RNA-binding transcription regulator activity / negative regulation of cytoplasmic translation / DnaA-L2 complex / translation repressor activity / negative regulation of DNA-templated DNA replication initiation / mRNA regulatory element binding translation repressor activity / assembly of large subunit precursor of preribosome / ribosome assembly / cytosolic ribosome assembly / response to reactive oxygen species / regulation of cell growth / DNA-templated transcription termination / response to radiation / mRNA 5'-UTR binding / large ribosomal subunit / ribosome binding / transferase activity / 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 / structural constituent of ribosome / ribosome / translation / response to antibiotic / negative regulation of DNA-templated transcription / mRNA binding / DNA binding / RNA binding / zinc ion binding / cytoplasm / cytosol Similarity search - Function | |||||||||||||||
| Biological species |  | |||||||||||||||
| Method | single particle reconstruction / cryo EM / Resolution: 2.98 Å | |||||||||||||||
|  Authors | Lauer S / Nikolay R / Spahn CMT | |||||||||||||||
| Funding support |  Germany, 4 items 
 | |||||||||||||||
|  Citation |  Journal: Nat Commun / Year: 2025 Title: The proline-rich antimicrobial peptide Api137 disrupts large ribosomal subunit assembly and induces misfolding. Authors: Simon Malte Lauer / Jakob Gasse / Andor Krizsan / Maren Reepmeyer / Thiemo Sprink / Rainer Nikolay / Christian M T Spahn / Ralf Hoffmann /  Abstract: The proline-rich antimicrobial designer peptide Api137 inhibits protein expression in bacteria by binding simultaneously to the ribosomal polypeptide exit tunnel and the release factor (RF), ...The proline-rich antimicrobial designer peptide Api137 inhibits protein expression in bacteria by binding simultaneously to the ribosomal polypeptide exit tunnel and the release factor (RF), depleting the cellular RF pool and leading to ribosomal arrest at stop codons. This study investigates the additional effect of Api137 on the assembly of ribosomes using an Escherichia coli reporter strain expressing one ribosomal protein per 30S and 50S subunit tagged with mCherry and EGFP, respectively. Separation of cellular extracts derived from cells exposed to Api137 in a sucrose gradient reveals elevated levels of partially assembled and not fully matured precursors of the 50S subunit (pre-50S). High-resolution structures obtained by cryogenic electron microscopy demonstrate that a large proportion of pre-50S states are missing up to five proteins (uL22, bL32, uL29, bL23, and uL16) and have misfolded helices in 23S rRNA domain IV. These data suggest a second mechanism for Api137, wherein it disrupts 50S subunit assembly by inducing the formation of misfolded precursor particles potentially incapable of evolving into active ribosomes, suggesting a bactericidal mechanism. | |||||||||||||||
| History | 
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- Structure visualization
Structure visualization
| Supplemental images | 
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- Downloads & links
Downloads & links
-EMDB archive
| Map data |  emd_51843.map.gz | 52.1 MB |  EMDB map data format | |
|---|---|---|---|---|
| Header (meta data) |  emd-51843-v30.xml  emd-51843.xml | 45.6 KB 45.6 KB | Display Display |  EMDB header | 
| FSC (resolution estimation) |  emd_51843_fsc.xml | 9.8 KB | Display |  FSC data file | 
| Images |  emd_51843.png | 159.7 KB | ||
| Masks |  emd_51843_msk_1.map | 103 MB |  Mask map | |
| Filedesc metadata |  emd-51843.cif.gz | 10.1 KB | ||
| Others |  emd_51843_half_map_1.map.gz  emd_51843_half_map_2.map.gz | 95.5 MB 95.5 MB | ||
| Archive directory |  http://ftp.pdbj.org/pub/emdb/structures/EMD-51843  ftp://ftp.pdbj.org/pub/emdb/structures/EMD-51843 | HTTPS FTP | 
-Validation report
| Summary document |  emd_51843_validation.pdf.gz | 1.1 MB | Display |  EMDB validaton report | 
|---|---|---|---|---|
| Full document |  emd_51843_full_validation.pdf.gz | 1.1 MB | Display | |
| Data in XML |  emd_51843_validation.xml.gz | 18.4 KB | Display | |
| Data in CIF |  emd_51843_validation.cif.gz | 23.8 KB | Display | |
| Arichive directory |  https://ftp.pdbj.org/pub/emdb/validation_reports/EMD-51843  ftp://ftp.pdbj.org/pub/emdb/validation_reports/EMD-51843 | HTTPS FTP | 
-Related structure data
| Related structure data |  9h3zMC  9h3kC  9h3lC  9h3mC  9h3nC  9h3oC  9h3pC  9h3qC  9h3rC  9h3sC  9h3tC  9h3uC  9h3vC  9h3wC  9h3xC  9h3yC  9ha1C  9ha2C  9ha3C  9ha4C  9ha5C  9ha6C  9ha7C  9haiC  9halC  9hamC M: atomic model generated by this map C: citing same article ( | 
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| Similar structure data | Similarity search - Function & homology  F&H Search | 
- Links
Links
| EMDB pages |  EMDB (EBI/PDBe) /  EMDataResource | 
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| Related items in Molecule of the Month | 
- Map
Map
| File |  Download / File: emd_51843.map.gz / Format: CCP4 / Size: 103 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) | ||||||||||||||||||||||||||||||||||||
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| Projections & slices | Image control
 
 Images are generated by Spider. | ||||||||||||||||||||||||||||||||||||
| Voxel size | X=Y=Z: 1.41333 Å | ||||||||||||||||||||||||||||||||||||
| Density | 
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| Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||
| Details | EMDB XML: 
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-Supplemental data
-Mask #1
| File |  emd_51843_msk_1.map | ||||||||||||
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| Projections & Slices | 
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| Density Histograms | 
-Half map: #2
| File | emd_51843_half_map_1.map | ||||||||||||
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| Projections & Slices | 
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| Density Histograms | 
-Half map: #1
| File | emd_51843_half_map_2.map | ||||||||||||
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| Projections & Slices | 
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| Density Histograms | 
- Sample components
Sample components
+Entire : pre50S precursor derived from Api137-treated cells
+Supramolecule #1: pre50S precursor derived from Api137-treated cells
+Macromolecule #1: Large ribosomal subunit protein bL32
+Macromolecule #2: Large ribosomal subunit protein bL33
+Macromolecule #3: Large ribosomal subunit protein bL34
+Macromolecule #4: Large ribosomal subunit protein bL35
+Macromolecule #5: Large ribosomal subunit protein bL36A
+Macromolecule #8: Large ribosomal subunit protein uL2
+Macromolecule #9: 50S ribosomal protein L3
+Macromolecule #10: Large ribosomal subunit protein uL4
+Macromolecule #11: Large ribosomal subunit protein uL5
+Macromolecule #12: Large ribosomal subunit protein uL6
+Macromolecule #13: Large ribosomal subunit protein bL9
+Macromolecule #14: Large ribosomal subunit protein uL13
+Macromolecule #15: Large ribosomal subunit protein uL14
+Macromolecule #16: Large ribosomal subunit protein uL15
+Macromolecule #17: 50S ribosomal protein L16
+Macromolecule #18: Large ribosomal subunit protein bL17
+Macromolecule #19: Large ribosomal subunit protein uL18
+Macromolecule #20: Large ribosomal subunit protein bL19
+Macromolecule #21: Large ribosomal subunit protein bL20
+Macromolecule #22: Large ribosomal subunit protein bL21
+Macromolecule #23: Large ribosomal subunit protein uL22
+Macromolecule #24: Large ribosomal subunit protein uL23
+Macromolecule #25: Large ribosomal subunit protein uL24
+Macromolecule #26: Large ribosomal subunit protein bL25
+Macromolecule #27: Large ribosomal subunit protein bL27
+Macromolecule #28: Large ribosomal subunit protein bL28
+Macromolecule #29: Large ribosomal subunit protein uL29
+Macromolecule #30: Large ribosomal subunit protein uL30
+Macromolecule #6: 23S ribosomal rRNA
+Macromolecule #7: 5S ribosomal RNA
-Experimental details
-Structure determination
| Method | cryo EM | 
|---|---|
|  Processing | single particle reconstruction | 
| Aggregation state | particle | 
- Sample preparation
Sample preparation
| Buffer | pH: 7.6 | 
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| Vitrification | Cryogen name: ETHANE | 
- Electron microscopy
Electron microscopy
| Microscope | TFS KRIOS | 
|---|---|
| Specialist optics | Energy filter - Name: GIF Bioquantum | 
| Image recording | Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Number real images: 2704 / Average exposure time: 1.17 sec. / Average electron dose: 45.0 e/Å2 | 
| Electron beam | Acceleration voltage: 300 kV / Electron source:  FIELD EMISSION GUN | 
| Electron optics | C2 aperture diameter: 100.0 µm / Illumination mode: OTHER / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 2.0 µm / Nominal defocus min: 0.8 µm / Nominal magnification: 81000 | 
| Sample stage | Cooling holder cryogen: NITROGEN | 
| Experimental equipment |  Model: Titan Krios / Image courtesy: FEI Company | 
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