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- PDB-9ha5: Pooled 50S subunit C_L2 precursor states supplemented with Api137 -

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Basic information

Entry
Database: PDB / ID: 9ha5
TitlePooled 50S subunit C_L2 precursor states supplemented with Api137
Components
  • (Large ribosomal subunit protein ...) x 16
  • 23S ribosomal RNA
  • 50S ribosomal protein L3
  • Apidaecins type 22
KeywordsRIBOSOME / antimicrobial peptide / RNA / ribosomal protein / PrAMP / proline-rich peptide / antibiotics / 50S / Api137
Function / homology
Function and homology information


transcriptional attenuation / endoribonuclease inhibitor activity / 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 ...transcriptional attenuation / endoribonuclease inhibitor activity / 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 / DNA-templated transcription termination / response to radiation / mRNA 5'-UTR binding / large ribosomal subunit / transferase activity / ribosomal large subunit assembly / large ribosomal subunit rRNA binding / cytosolic large ribosomal subunit / cytoplasmic translation / negative regulation of translation / rRNA binding / defense response to bacterium / ribosome / structural constituent of ribosome / translation / innate immune response / response to antibiotic / negative regulation of DNA-templated transcription / mRNA binding / DNA binding / RNA binding / extracellular region / zinc ion binding / cytosol / cytoplasm
Similarity search - Function
Apidaecin / Apidaecin / Ribosomal protein L21, conserved site / Ribosomal protein L21 signature. / : / Ribosomal protein L17 signature. / Ribosomal protein L32p, bacterial type / : / : / Ribosomal protein L19, conserved site ...Apidaecin / Apidaecin / Ribosomal protein L21, conserved site / Ribosomal protein L21 signature. / : / Ribosomal protein L17 signature. / Ribosomal protein L32p, bacterial type / : / : / Ribosomal protein L19, conserved site / Ribosomal protein L19 signature. / Ribosomal protein L20 signature. / Ribosomal protein L22, bacterial/chloroplast-type / Ribosomal protein L14P, bacterial-type / Ribosomal protein L34, conserved site / Ribosomal protein L34 signature. / Ribosomal protein L2, bacterial/organellar-type / Ribosomal protein L30, bacterial-type / : / Ribosomal protein L20 / Ribosomal L32p protein family / Ribosomal protein L19 / Ribosomal protein L19 / Ribosomal protein L20 / Ribosomal protein L20, C-terminal / Ribosomal protein L19 superfamily / Ribosomal protein L21 / Ribosomal protein L32p / Ribosomal protein L17 / Ribosomal protein L17 superfamily / Ribosomal protein L17 / Ribosomal proteins 50S L24/mitochondrial 39S L24 / Ribosomal protein L21-like / L21-like superfamily / Ribosomal prokaryotic L21 protein / Ribosomal protein L34 / Ribosomal protein L34 / Ribosomal protein L24 / Ribosomal protein L13, bacterial-type / Ribosomal protein L3, bacterial/organelle-type / Ribosomal protein L15, bacterial-type / 50S ribosomal protein uL4 / Ribosomal protein L23/L25, conserved site / Ribosomal protein L23 signature. / Ribosomal protein L30, conserved site / Ribosomal protein L30 signature. / Ribosomal protein L2 signature. / Ribosomal protein L29, conserved site / Ribosomal protein L29 signature. / Ribosomal protein L2, conserved site / Ribosomal protein L15, conserved site / Ribosomal protein L15 signature. / Ribosomal protein L13 signature. / Ribosomal protein L13, conserved site / Ribosomal protein L2, domain 3 / Ribosomal protein L22/L17, conserved site / Ribosomal protein L22 signature. / Ribosomal protein L14P, conserved site / Ribosomal protein L14 signature. / Ribosomal L29 protein / Ribosomal protein L29/L35 / Ribosomal protein L29/L35 superfamily / Ribosomal Proteins L2, C-terminal domain / Ribosomal protein L2, C-terminal / Ribosomal Proteins L2, C-terminal domain / Ribosomal Proteins L2, RNA binding domain / Ribosomal Proteins L2, RNA binding domain / Ribosomal Proteins L2, RNA binding domain / Ribosomal protein L24 signature. / Ribosomal protein L2 / Ribosomal protein L24/L26, conserved site / KOW (Kyprides, Ouzounis, Woese) motif. / Ribosomal protein L30, ferredoxin-like fold domain / Ribosomal protein L30p/L7e / Ribosomal protein L13 / Ribosomal protein L13 / Ribosomal protein L13 superfamily / Ribosomal protein L23 / Ribosomal protein L30, ferredoxin-like fold domain superfamily / Ribosomal protein L15 / Ribosomal protein L25/L23 / Ribosomal proteins 50S-L15, 50S-L18e, 60S-L27A / Ribosomal protein L14p/L23e / Ribosomal protein L14P / Ribosomal protein L14 superfamily / Ribosomal protein L14p/L23e / Ribosomal protein L22/L17 / Ribosomal protein L22p/L17e / Ribosomal protein L22/L17 superfamily / Ribosomal protein L26/L24, KOW domain / Ribosomal protein L3, conserved site / Ribosomal protein L3 signature. / Ribosomal protein L3 / Ribosomal protein L3 / Ribosomal protein L18e/L15P / Ribosomal L18e/L15P superfamily / Ribosomal protein L4/L1e / Ribosomal protein L4 domain superfamily / Ribosomal protein L4/L1 family / Translation protein SH3-like domain superfamily
Similarity search - Domain/homology
: / RNA / RNA (> 10) / RNA (> 100) / RNA (> 1000) / Large ribosomal subunit protein uL15 / Large ribosomal subunit protein bL19 / Large ribosomal subunit protein bL20 / Large ribosomal subunit protein uL29 / Large ribosomal subunit protein bL32 ...: / RNA / RNA (> 10) / RNA (> 100) / RNA (> 1000) / Large ribosomal subunit protein uL15 / Large ribosomal subunit protein bL19 / Large ribosomal subunit protein bL20 / Large ribosomal subunit protein uL29 / Large ribosomal subunit protein bL32 / Large ribosomal subunit protein bL34 / Large ribosomal subunit protein uL13 / Large ribosomal subunit protein uL14 / Large ribosomal subunit protein uL23 / Large ribosomal subunit protein bL17 / Large ribosomal subunit protein bL21 / Large ribosomal subunit protein uL30 / Apidaecins type 22 / Large ribosomal subunit protein uL2 / Large ribosomal subunit protein uL3 / Large ribosomal subunit protein uL24 / Large ribosomal subunit protein uL4 / Large ribosomal subunit protein uL22
Similarity search - Component
Biological speciesEscherichia coli (E. coli)
Apis mellifera (honey bee)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.3 Å
AuthorsLauer, S. / Nikolay, R. / Spahn, C.M.T.
Funding support Germany, 4items
OrganizationGrant numberCountry
German Federal Ministry for Education and Research16GW0300 Germany
German Federal Ministry for Education and Research16GW0299K Germany
German Research Foundation (DFG)EXC2008/1-390540038 Germany
German Research Foundation (DFG)INST 335/588-1 FUGG Germany
CitationJournal: 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
DepositionNov 1, 2024Deposition site: PDBE / Processing site: PDBE
Revision 1.0Jan 22, 2025Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
0: Large ribosomal subunit protein bL32
2: Large ribosomal subunit protein bL34
D: 50S ribosomal protein L3
E: Large ribosomal subunit protein uL4
J: Large ribosomal subunit protein uL13
K: Large ribosomal subunit protein uL14
L: Large ribosomal subunit protein uL15
N: Large ribosomal subunit protein bL17
P: Large ribosomal subunit protein bL19
Q: Large ribosomal subunit protein bL20
R: Large ribosomal subunit protein bL21
S: Large ribosomal subunit protein uL22
T: Large ribosomal subunit protein uL23
U: Large ribosomal subunit protein uL24
Y: Large ribosomal subunit protein uL29
Z: Large ribosomal subunit protein uL30
A: 23S ribosomal RNA
C: Large ribosomal subunit protein uL2
y: Apidaecins type 22


Theoretical massNumber of molelcules
Total (without water)1,172,90019
Polymers1,172,90019
Non-polymers00
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

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Large ribosomal subunit protein ... , 16 types, 16 molecules 02EJKLNPQRSTUYZC

#1: Protein Large ribosomal subunit protein bL32 / 50S ribosomal protein L32


Mass: 6332.249 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / Strain: MC4100 / References: UniProt: P0A7N4
#2: Protein/peptide Large ribosomal subunit protein bL34 / 50S ribosomal protein L34


Mass: 5397.463 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / Strain: MC4100 / References: UniProt: P0A7P5
#4: Protein Large ribosomal subunit protein uL4 / 50S ribosomal protein L4


Mass: 22121.566 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / Strain: MC4100 / References: UniProt: P60723
#5: Protein Large ribosomal subunit protein uL13 / 50S ribosomal protein L13


Mass: 16050.606 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / Strain: MC4100 / References: UniProt: P0AA10
#6: Protein Large ribosomal subunit protein uL14 / 50S ribosomal protein L14


Mass: 13451.910 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / Strain: MC4100 / References: UniProt: P0ADY3
#7: Protein Large ribosomal subunit protein uL15 / 50S ribosomal protein L15


Mass: 14877.273 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / Strain: MC4100 / References: UniProt: P02413
#8: Protein Large ribosomal subunit protein bL17 / 50S ribosomal protein L17


Mass: 13721.938 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / Strain: MC4100 / References: UniProt: P0AG44
#9: Protein Large ribosomal subunit protein bL19 / 50S ribosomal protein L19


Mass: 13028.082 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / Strain: MC4100 / References: UniProt: P0A7K6
#10: Protein Large ribosomal subunit protein bL20 / 50S ribosomal protein L20


Mass: 13396.828 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / Strain: MC4100 / References: UniProt: P0A7L3
#11: Protein Large ribosomal subunit protein bL21 / 50S ribosomal protein L21


Mass: 11586.374 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / Strain: MC4100 / References: UniProt: P0AG48
#12: Protein Large ribosomal subunit protein uL22 / 50S ribosomal protein L22


Mass: 12253.359 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / Strain: MC4100 / References: UniProt: P61175
#13: Protein Large ribosomal subunit protein uL23 / 50S ribosomal protein L23


Mass: 10546.472 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / Strain: MC4100 / References: UniProt: P0ADZ0
#14: Protein Large ribosomal subunit protein uL24 / 50S ribosomal protein L24


Mass: 11078.874 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / Strain: MC4100 / References: UniProt: P60624
#15: Protein Large ribosomal subunit protein uL29 / 50S ribosomal protein L29


Mass: 7286.464 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / Strain: MC4100 / References: UniProt: P0A7M6
#16: Protein Large ribosomal subunit protein uL30 / 50S ribosomal protein L30


Mass: 6423.625 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / Strain: MC4100 / References: UniProt: P0AG51
#18: Protein Large ribosomal subunit protein uL2 / 50S ribosomal protein L2


Mass: 29663.244 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / Strain: MC4100 / References: UniProt: P60422

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Protein / RNA chain / Protein/peptide , 3 types, 3 molecules DAy

#17: RNA chain 23S ribosomal RNA


Mass: 941321.250 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / Strain: MC4100 / References: GenBank: 1036415628
#19: Protein/peptide Apidaecins type 22


Mass: 2084.452 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) Apis mellifera (honey bee) / References: UniProt: P35581
#3: Protein 50S ribosomal protein L3 / ribosomal protein uL3


Mass: 22277.535 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / Strain: MC4100 / References: UniProt: P60438

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Details

Has protein modificationN

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: Pooled pre50S substates derived from Api137-treated cells supplemented with Api137 - truncated model with invariant parts between substates
Type: RIBOSOME / Entity ID: all / Source: NATURAL
Source (natural)Organism: Escherichia coli (E. coli) / Strain: MC4100
Buffer solutionpH: 7.6
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: TFS KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: OTHER
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2000 nm / Nominal defocus min: 800 nm / Cs: 2.7 mm / C2 aperture diameter: 100 µm
Image recordingAverage exposure time: 1.2 sec. / Electron dose: 46.2 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Num. of real images: 2794

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Processing

EM softwareName: cryoSPARC / Version: 4.21 / Category: classification
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.3 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 45271 / Symmetry type: POINT

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