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- PDB-9h9m: Complex 4 (HEAD) 30S-GE81112 (weak residual tRNA) -

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Basic information

Entry
Database: PDB / ID: 9h9m
TitleComplex 4 (HEAD) 30S-GE81112 (weak residual tRNA)
Components
  • (Small ribosomal subunit protein ...) x 8
  • 16S RNA (1542-MER)
KeywordsRIBOSOME / Antibiotic / initiation factor / GE81112 / 30S
Function / homology
Function and homology information


transcription antitermination factor activity, RNA binding / transcription elongation factor complex / regulation of DNA-templated transcription elongation / transcription antitermination / ribosome biogenesis / ribosomal small subunit assembly / small ribosomal subunit / cytosolic small ribosomal subunit / cytoplasmic translation / tRNA binding ...transcription antitermination factor activity, RNA binding / transcription elongation factor complex / regulation of DNA-templated transcription elongation / transcription antitermination / ribosome biogenesis / ribosomal small subunit assembly / small ribosomal subunit / cytosolic small ribosomal subunit / cytoplasmic translation / tRNA binding / negative regulation of translation / rRNA binding / structural constituent of ribosome / ribosome / translation / mRNA binding / RNA binding / zinc ion binding / membrane / cytosol / cytoplasm
Similarity search - Function
Ribosomal protein S14, bacterial/plastid / Ribosomal protein S19, bacterial-type / Ribosomal protein S3, bacterial-type / Ribosomal protein S13, bacterial-type / Ribosomal protein S7, bacterial/organellar-type / Ribosomal protein S2, bacteria/mitochondria/plastid / Ribosomal protein S9, bacterial/plastid / K Homology domain / K homology RNA-binding domain / Ribosomal protein S2 signature 2. ...Ribosomal protein S14, bacterial/plastid / Ribosomal protein S19, bacterial-type / Ribosomal protein S3, bacterial-type / Ribosomal protein S13, bacterial-type / Ribosomal protein S7, bacterial/organellar-type / Ribosomal protein S2, bacteria/mitochondria/plastid / Ribosomal protein S9, bacterial/plastid / K Homology domain / K homology RNA-binding domain / Ribosomal protein S2 signature 2. / Ribosomal protein S3, conserved site / Ribosomal protein S3 signature. / Ribosomal protein S10, conserved site / Ribosomal protein S10 signature. / Ribosomal protein S14, conserved site / Ribosomal protein S14 signature. / Ribosomal protein S2 signature 1. / KH domain / Type-2 KH domain profile. / K Homology domain, type 2 / Ribosomal protein S3, C-terminal / Ribosomal protein S3, C-terminal domain / Ribosomal protein S3, C-terminal domain superfamily / Ribosomal protein S15/S19, conserved site / Ribosomal protein S19 signature. / Ribosomal protein S10 / Ribosomal protein S19/S15 / Ribosomal protein S19/S15, superfamily / Ribosomal protein S19 / Ribosomal protein S2, conserved site / Ribosomal protein S7, conserved site / Ribosomal protein S7 signature. / Ribosomal protein S2 / Ribosomal protein S2, flavodoxin-like domain superfamily / Ribosomal protein S2 / K homology domain superfamily, prokaryotic type / Ribosomal protein S13, conserved site / Ribosomal protein S13 signature. / Ribosomal protein S13 / 30s ribosomal protein S13, C-terminal / Ribosomal protein S13/S18 / Ribosomal protein S13 family profile. / Ribosomal protein S14 / Ribosomal protein S14p/S29e / K homology domain-like, alpha/beta / Ribosomal protein S13-like, H2TH / Ribosomal protein S9, conserved site / Ribosomal protein S9 signature. / Ribosomal protein S10p/S20e / Ribosomal protein S10 domain / Ribosomal protein S10 domain superfamily / Ribosomal protein S10p/S20e / Ribosomal protein S5/S7 / Ribosomal protein S7 domain / Ribosomal protein S7 domain superfamily / Ribosomal protein S7p/S5e / Ribosomal protein S9 / Ribosomal protein S9/S16 / Ribosomal protein S5 domain 2-type fold, subgroup / Ribosomal protein S5 domain 2-type fold
Similarity search - Domain/homology
: / RNA / RNA (> 10) / RNA (> 100) / RNA (> 1000) / Small ribosomal subunit protein uS7 / Small ribosomal subunit protein uS10 / Small ribosomal subunit protein uS13 / Small ribosomal subunit protein uS19 / Small ribosomal subunit protein uS2 ...: / RNA / RNA (> 10) / RNA (> 100) / RNA (> 1000) / Small ribosomal subunit protein uS7 / Small ribosomal subunit protein uS10 / Small ribosomal subunit protein uS13 / Small ribosomal subunit protein uS19 / Small ribosomal subunit protein uS2 / Small ribosomal subunit protein uS3 / Small ribosomal subunit protein uS9 / Small ribosomal subunit protein uS14
Similarity search - Component
Biological speciesEscherichia coli (E. coli)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.1 Å
AuthorsSchedlbauer, A. / Han, X. / van Bakel, W. / Kaminishi, T. / Ochoa-Lizarralde, B. / Iturrioz, I. / Capuni, R. / Parry, R. / Zegarra, R. / Gil-Carton, D. ...Schedlbauer, A. / Han, X. / van Bakel, W. / Kaminishi, T. / Ochoa-Lizarralde, B. / Iturrioz, I. / Capuni, R. / Parry, R. / Zegarra, R. / Gil-Carton, D. / Lopez-Alonso, J.P. / Barragan Sanz, K. / Brandi, L. / Gualerzi, C.O. / Fucini, P. / Connell, S.R.
Funding support Spain, 1items
OrganizationGrant numberCountry
Ministerio de Ciencia e Innovacion (MCIN)PID2021-122705OB-I00 Spain
CitationJournal: bioRxiv / Year: 2024
Title: A binding site for the antibiotic GE81112 in the ribosomal mRNA channel.
Authors: Andreas Schedlbauer / Xu Han / Wouter van Bakel / Tatsuya Kaminishi / Borja Ochoa-Lizarralde / Idoia Iturrioz / Retina Çapuni / Ransford Parry / Ronny Zegarra / David Gil-Carton / Jorge P ...Authors: Andreas Schedlbauer / Xu Han / Wouter van Bakel / Tatsuya Kaminishi / Borja Ochoa-Lizarralde / Idoia Iturrioz / Retina Çapuni / Ransford Parry / Ronny Zegarra / David Gil-Carton / Jorge P López-Alonso / Kristina Barragan Sanz / Letizia Brandi / Claudio O Gualerzi / Paola Fucini / Sean R Connell /
Abstract: The initiation phase is the rate-limiting step of protein synthesis (translation) and is finely regulated, making it an important drug target. In bacteria, initiation is guided by three initiation ...The initiation phase is the rate-limiting step of protein synthesis (translation) and is finely regulated, making it an important drug target. In bacteria, initiation is guided by three initiation factors and involves positioning the start site on the messenger RNA within the P-site on the small ribosomal subunit (30S), where it is decoded by the initiator tRNA. This process can be efficiently inhibited by GE81112, a natural hydrophilic, noncyclic, nonribosomal tetrapeptide. It is found in nature in three structural variants (A, B and B1 with molecular masses of 643-658 Da). Previous biochemical and structural characterisation of GE81112 indicates that the primary mechanism of action of this antibiotic is to (1) prevent the initiator tRNA from binding correctly to the P-site and (2) block conformational rearrangements in initiation factor IF3, resulting in an 30S pre/C state. In this study, using cryoEM, we have determined the binding site of GE81112 in initiation complexes (3.2-3.7Å) and on empty ribosomes (2.09 Å). This binding site is within the mRNA channel (E-site) but remote from the binding site of the initiation factors and initiator tRNA. This suggests that it acts allosterically to prevent the initiator tRNA from being locked into place. The binding mode is consistent with previous biochemical studies and recent work identifying the key pharmacophores of GE81112.
History
DepositionOct 31, 2024Deposition site: PDBE / Processing site: PDBE
Revision 1.0Aug 6, 2025Provider: repository / Type: Initial release
Revision 1.0Aug 6, 2025Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
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Revision 1.0Aug 6, 2025Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Aug 6, 2025Data content type: Mask / Part number: 1 / Data content type: Mask / Provider: repository / Type: Initial release
Revision 1.0Aug 6, 2025Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
1: 16S RNA (1542-MER)
B: Small ribosomal subunit protein uS2
C: Small ribosomal subunit protein uS3
G: Small ribosomal subunit protein uS7
I: Small ribosomal subunit protein uS9
J: Small ribosomal subunit protein uS10
M: Small ribosomal subunit protein uS13
N: Small ribosomal subunit protein uS14
S: Small ribosomal subunit protein uS19
hetero molecules


Theoretical massNumber of molelcules
Total (without water)635,66052
Polymers634,5749
Non-polymers1,08643
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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RNA chain , 1 types, 1 molecules 1

#1: RNA chain 16S RNA (1542-MER)


Mass: 499873.406 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (E. coli) / Production host: Escherichia coli (E. coli) / References: GenBank: 1403754823

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Small ribosomal subunit protein ... , 8 types, 8 molecules BCGIJMNS

#2: Protein Small ribosomal subunit protein uS2 / 30S ribosomal protein S2


Mass: 26781.670 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (E. coli) / Gene: rpsB, b0169, JW0164 / Production host: Escherichia coli (E. coli) / References: UniProt: P0A7V0
#3: Protein Small ribosomal subunit protein uS3 / 30S ribosomal protein S3


Mass: 26031.316 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (E. coli) / Gene: rpsC, b3314, JW3276 / Production host: Escherichia coli (E. coli) / References: UniProt: P0A7V3
#4: Protein Small ribosomal subunit protein uS7 / 30S ribosomal protein S7


Mass: 20055.156 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (E. coli) / Gene: rpsG, b3341, JW3303 / Production host: Escherichia coli (E. coli) / References: UniProt: P02359
#5: Protein Small ribosomal subunit protein uS9 / 30S ribosomal protein S9


Mass: 14886.270 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (E. coli) / Gene: rpsI, b3230, JW3199 / Production host: Escherichia coli (E. coli) / References: UniProt: P0A7X3
#6: Protein Small ribosomal subunit protein uS10 / 30S ribosomal protein S10 / Transcription termination/antitermination protein NusE


Mass: 11755.597 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (E. coli) / Gene: rpsJ, nusE, b3321, JW3283 / Production host: Escherichia coli (E. coli) / References: UniProt: P0A7R5
#7: Protein Small ribosomal subunit protein uS13 / 30S ribosomal protein S13


Mass: 13128.467 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (E. coli) / Gene: rpsM, b3298, JW3260 / Production host: Escherichia coli (E. coli) / References: UniProt: P0A7S9
#8: Protein Small ribosomal subunit protein uS14 / 30S ribosomal protein S14


Mass: 11606.560 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (E. coli) / Gene: rpsN, b3307, JW3269 / Production host: Escherichia coli (E. coli) / References: UniProt: P0AG59
#9: Protein Small ribosomal subunit protein uS19 / 30S ribosomal protein S19


Mass: 10455.355 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (E. coli) / Gene: rpsS, b3316, JW3278 / Production host: Escherichia coli (E. coli) / References: UniProt: P0A7U3

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Non-polymers , 2 types, 43 molecules

#10: Chemical...
ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 42 / Source method: obtained synthetically / Formula: Mg
#11: Chemical ChemComp-ZN / ZINC ION


Mass: 65.409 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Zn

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Details

Has ligand of interestN
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: Complex 4 (HEAD) 30S-GE81112 / Type: RIBOSOME / Entity ID: #1-#9 / Source: NATURAL
Source (natural)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 7.7
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid type: Quantifoil R2/2
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: SPOT SCAN
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 3250 nm / Nominal defocus min: 500 nm
Image recordingElectron dose: 44.08 e/Å2 / Film or detector model: FEI FALCON III (4k x 4k)

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Processing

EM software
IDNameCategory
1crYOLOparticle selection
2EPUimage acquisition
4CTFFINDCTF correction
5RELIONCTF correction
8UCSF ChimeraXmodel fitting
9Cootmodel fitting
11RELIONinitial Euler assignment
12RELIONfinal Euler assignment
13RELIONclassification
14RELION3D reconstruction
15ISOLDEmodel refinement
16PHENIXmodel refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.1 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 108310 / Symmetry type: POINT
Atomic model buildingPDB-ID: 4ybb

4ybb


Accession code: 4ybb / Source name: PDB / Type: experimental model

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