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- PDB-6nqb: Role of Era in Assembly and Homeostasis of the Ribosomal Small Subunit -

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Basic information

Entry
Database: PDB / ID: 6nqb
TitleRole of Era in Assembly and Homeostasis of the Ribosomal Small Subunit
Components
  • (30S ribosomal protein ...) x 15
  • 16S RIBOSOMAL RNA
KeywordsRIBOSOME / Ribosome assembly / 30S subunit / YjeQ protein / Era protein / cryo-electron microscopy
Function / homology
Function and homology information


ornithine decarboxylase inhibitor activity / transcription antitermination factor activity, RNA binding / four-way junction DNA binding / negative regulation of translational initiation / mRNA regulatory element binding translation repressor activity / transcription elongation factor complex / regulation of DNA-templated transcription elongation / DNA endonuclease activity / transcription antitermination / DNA-templated transcription termination ...ornithine decarboxylase inhibitor activity / transcription antitermination factor activity, RNA binding / four-way junction DNA binding / negative regulation of translational initiation / mRNA regulatory element binding translation repressor activity / transcription elongation factor complex / regulation of DNA-templated transcription elongation / DNA endonuclease activity / transcription antitermination / DNA-templated transcription termination / maintenance of translational fidelity / mRNA 5'-UTR binding / ribosomal small subunit biogenesis / small ribosomal subunit rRNA binding / ribosome biogenesis / regulation of translation / ribosomal small subunit assembly / small ribosomal subunit / cytosolic small ribosomal subunit / cytoplasmic translation / tRNA binding / molecular adaptor activity / rRNA binding / ribosome / structural constituent of ribosome / translation / response to antibiotic / mRNA binding / zinc ion binding / cytosol / cytoplasm
Similarity search - Function
Helix Hairpins - #1480 / S16 Ribosomal Protein; Chain: A; / Ribosomal protein S16 / Ribosomal protein S18 / 30s Ribosomal Protein S18 / Ribosomal protein S20 / 30s Ribosomal Protein S19; Chain A / Ribosomal protein S19/S15 / Ribosomal protein S3, C-terminal domain / Ribosomal Protein S8; Chain: A, domain 1 - #30 ...Helix Hairpins - #1480 / S16 Ribosomal Protein; Chain: A; / Ribosomal protein S16 / Ribosomal protein S18 / 30s Ribosomal Protein S18 / Ribosomal protein S20 / 30s Ribosomal Protein S19; Chain A / Ribosomal protein S19/S15 / Ribosomal protein S3, C-terminal domain / Ribosomal Protein S8; Chain: A, domain 1 - #30 / Ribosomal protein S6/Translation elongation factor EF1B / Ribosomal protein S3 C-terminal domain / Helix hairpin bin / Dna Ligase; domain 1 - #10 / Ribosomal protein S10 / K homology (KH) domain / Glucose-6-phosphate isomerase like protein; domain 1 / Ribosomal Protein S8; Chain: A, domain 1 / GMP Synthetase; Chain A, domain 3 / Ribosomal protein S14, bacterial/plastid / Ribosomal protein S16, conserved site / Ribosomal protein S16 signature. / Nucleic acid-binding proteins / Dna Ligase; domain 1 / Methane Monooxygenase Hydroxylase; Chain G, domain 1 / Ribosomal protein S3, bacterial-type / Ribosomal protein S6, conserved site / Ribosomal protein S6 signature. / Ribosomal protein S19, bacterial-type / Ribosomal protein S20 / Ribosomal protein S20 superfamily / Ribosomal protein S20 / Ribosomal protein S4, bacterial-type / 30S ribosomal protein S17 / Ribosomal protein S5, bacterial-type / Ribosomal protein S6, plastid/chloroplast / Ribosomal protein S2, bacteria/mitochondria/plastid / Ribosomal protein S18, conserved site / Ribosomal protein S18 signature. / Ribosomal protein S16 / Ribosomal protein S16 domain superfamily / Ribosomal protein S16 / Ribosomal protein S15, bacterial-type / Ribosomal protein S6 / Ribosomal protein S6 / Ribosomal protein S6 superfamily / Ribosomal protein S12, bacterial-type / Translation elongation factor EF1B/ribosomal protein S6 / Ribosomal protein S18 / Ribosomal protein S18 / Ribosomal protein S2 signature 2. / Ribosomal protein S18 superfamily / K Homology domain / K homology RNA-binding domain / Few Secondary Structures / Irregular / Ribosomal protein S10, conserved site / Ribosomal protein S10 signature. / Ribosomal protein S3, conserved site / Ribosomal protein S3 signature. / Ribosomal protein S14, conserved site / Ribosomal protein S14 signature. / Ribosomal protein S2 signature 1. / OB fold (Dihydrolipoamide Acetyltransferase, E2P) / 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 S5, N-terminal, conserved site / Ribosomal protein S5 signature. / Ribosomal protein S2 / Ribosomal protein S2, flavodoxin-like domain superfamily / Ribosomal protein S2 / Ribosomal protein S5 / Ribosomal protein S17, conserved site / Ribosomal protein S17 signature. / S5 double stranded RNA-binding domain profile. / K homology domain superfamily, prokaryotic type / Ribosomal protein S5, N-terminal / Helix Hairpins / Ribosomal protein S5, N-terminal domain / Ribosomal protein S5, C-terminal / Ribosomal protein S5, C-terminal domain / Ribosomal protein S8 signature. / Ribosomal protein S4/S9 N-terminal domain / Ribosomal protein S4, conserved site / Ribosomal protein S4 signature. / Ribosomal protein S4/S9 N-terminal domain / Ribosomal protein S4/S9, N-terminal / Ribosomal protein S15 signature.
Similarity search - Domain/homology
RNA / RNA (> 10) / RNA (> 100) / RNA (> 1000) / Small ribosomal subunit protein bS6 / Small ribosomal subunit protein uS14 / 30S ribosomal protein S17 / 30S ribosomal protein S3 / Small ribosomal subunit protein uS5 / 30S ribosomal protein S10 ...RNA / RNA (> 10) / RNA (> 100) / RNA (> 1000) / Small ribosomal subunit protein bS6 / Small ribosomal subunit protein uS14 / 30S ribosomal protein S17 / 30S ribosomal protein S3 / Small ribosomal subunit protein uS5 / 30S ribosomal protein S10 / 30S ribosomal protein S18 / Small ribosomal subunit protein uS8 / 30S ribosomal protein S19 / 30S ribosomal protein S4 / Small ribosomal subunit protein bS6 / Small ribosomal subunit protein uS10 / Small ribosomal subunit protein bS16 / Small ribosomal subunit protein bS20 / Small ribosomal subunit protein uS2 / Small ribosomal subunit protein uS3 / Small ribosomal subunit protein uS4 / Small ribosomal subunit protein uS5 / Small ribosomal subunit protein uS15 / Small ribosomal subunit protein uS14 / Small ribosomal subunit protein uS17 / Small ribosomal subunit protein uS15 / 30S ribosomal protein S16 / 30S ribosomal protein S20 / Small ribosomal subunit protein uS2 / 30S ribosomal protein S12
Similarity search - Component
Biological speciesEscherichia coli (E. coli)
Escherichia coli H736 (bacteria)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.8 Å
AuthorsOrtega, J.
Funding support Canada, 1items
OrganizationGrant numberCountry
Canadian Institutes of Health Research (CIHR)PJT-153044 Canada
CitationJournal: Nucleic Acids Res / Year: 2019
Title: Role of Era in assembly and homeostasis of the ribosomal small subunit.
Authors: Aida Razi / Joseph H Davis / Yumeng Hao / Dushyant Jahagirdar / Brett Thurlow / Kaustuv Basu / Nikhil Jain / Josue Gomez-Blanco / Robert A Britton / Javier Vargas / Alba Guarné / Sarah A ...Authors: Aida Razi / Joseph H Davis / Yumeng Hao / Dushyant Jahagirdar / Brett Thurlow / Kaustuv Basu / Nikhil Jain / Josue Gomez-Blanco / Robert A Britton / Javier Vargas / Alba Guarné / Sarah A Woodson / James R Williamson / Joaquin Ortega /
Abstract: Assembly factors provide speed and directionality to the maturation process of the 30S subunit in bacteria. To gain a more precise understanding of how these proteins mediate 30S maturation, it is ...Assembly factors provide speed and directionality to the maturation process of the 30S subunit in bacteria. To gain a more precise understanding of how these proteins mediate 30S maturation, it is important to expand on studies of 30S assembly intermediates purified from bacterial strains lacking particular maturation factors. To reveal the role of the essential protein Era in the assembly of the 30S ribosomal subunit, we analyzed assembly intermediates that accumulated in Era-depleted Escherichia coli cells using quantitative mass spectrometry, high resolution cryo-electron microscopy and in-cell footprinting. Our combined approach allowed for visualization of the small subunit as it assembled and revealed that with the exception of key helices in the platform domain, all other 16S rRNA domains fold even in the absence of Era. Notably, the maturing particles did not stall while waiting for the platform domain to mature and instead re-routed their folding pathway to enable concerted maturation of other structural motifs spanning multiple rRNA domains. We also found that binding of Era to the mature 30S subunit destabilized helix 44 and the decoding center preventing binding of YjeQ, another assembly factor. This work establishes Era's role in ribosome assembly and suggests new roles in maintaining ribosome homeostasis.
History
DepositionJan 20, 2019Deposition site: RCSB / Processing site: RCSB
Revision 1.0Jun 26, 2019Provider: repository / Type: Initial release
Revision 1.1Jul 17, 2019Group: Data collection / Database references / Category: citation
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_ASTM / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year
Revision 1.2Sep 18, 2019Group: Data collection / Database references / Category: citation / struct_ref / struct_ref_seq
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _struct_ref.db_code / _struct_ref.pdbx_db_accession / _struct_ref_seq.pdbx_db_accession
Revision 1.3Dec 18, 2019Group: Author supporting evidence / Other / Category: atom_sites / pdbx_audit_support
Item: _atom_sites.fract_transf_matrix[1][1] / _atom_sites.fract_transf_matrix[2][2] ..._atom_sites.fract_transf_matrix[1][1] / _atom_sites.fract_transf_matrix[2][2] / _atom_sites.fract_transf_matrix[3][3] / _pdbx_audit_support.funding_organization
Revision 1.4Mar 20, 2024Group: Data collection / Database references / Category: chem_comp_atom / chem_comp_bond / database_2
Item: _database_2.pdbx_DOI / _database_2.pdbx_database_accession

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Structure visualization

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Assembly

Deposited unit
C: 30S ribosomal protein S3
J: 30S ribosomal protein S10
N: 30S ribosomal protein S14
S: 30S ribosomal protein S19
A: 16S RIBOSOMAL RNA
D: 30S ribosomal protein S4
E: 30S ribosomal protein S5
F: 30S ribosomal protein S6
H: 30S ribosomal protein S8
L: 30S ribosomal protein S12
O: 30S ribosomal protein S15
P: 30S RIBOSOMAL PROTEIN bS16
Q: 30S ribosomal protein S17
R: 30S ribosomal protein S18
T: 30S ribosomal protein S20
B: 30S ribosomal protein S2
hetero molecules


Theoretical massNumber of molelcules
Total (without water)699,25917
Polymers699,23516
Non-polymers241
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: mass spectrometry
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

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30S ribosomal protein ... , 15 types, 15 molecules CJNSDEFHLOPQRTB

#1: Protein 30S ribosomal protein S3


Mass: 23078.785 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (E. coli) / Gene: rpsC, NCTC9094_00425 / Production host: Escherichia coli (E. coli) / References: UniProt: A0A376HTV6, UniProt: P0A7V3*PLUS
#2: Protein 30S ribosomal protein S10


Mass: 11196.988 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (E. coli) / Gene: rpsJ, HMPREF9552_00980 / Production host: Escherichia coli (E. coli) / References: UniProt: D7X302, UniProt: P0A7R5*PLUS
#3: Protein 30S ribosomal protein S14


Mass: 11360.276 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (E. coli)
Gene: rpsN, C0R28_24180, D9J44_12955, ERS085374_04715, SAMEA3485113_04711
Production host: Escherichia coli (E. coli) / References: UniProt: A0A090BZT4, UniProt: P0AG59*PLUS
#4: Protein 30S ribosomal protein S19


Mass: 8441.836 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli H736 (bacteria) / Gene: rpsS, ECHG_03182 / Production host: Escherichia coli (E. coli) / References: UniProt: F4SQ43
#6: Protein 30S ribosomal protein S4


Mass: 23383.002 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (E. coli) / Gene: rpsD, A1UM_03988 / Production host: Escherichia coli (E. coli) / References: UniProt: L3PZ69, UniProt: P0A7V8*PLUS
#7: Protein 30S ribosomal protein S5


Mass: 15675.102 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (E. coli) / Gene: rpsE, AOX65_22485 / Production host: Escherichia coli (E. coli) / References: UniProt: A1AGJ2, UniProt: P0A7W1*PLUS
#8: Protein 30S ribosomal protein S6


Mass: 10972.643 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (E. coli)
Gene: rpsF, B9M99_08080, BE963_12515, BMT53_12235, CIJ94_19015, D2188_21030, DTM45_20815, DU321_10545, Eco118UI_24760, ECONIH1_24970, EFV14_11625, EIA08_19855, HMPREF3040_03088, NCTC9077_05624
Production host: Escherichia coli (E. coli) / References: UniProt: A0A074QGH8, UniProt: P02358*PLUS
#9: Protein 30S ribosomal protein S8


Mass: 14015.361 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (E. coli) / Gene: rpsH, HMPREF9530_00381 / Production host: Escherichia coli (E. coli) / References: UniProt: D8A1L7
#10: Protein 30S ribosomal protein S12


Mass: 13636.961 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (E. coli) / Gene: rpsL, EC970259_3994 / Production host: Escherichia coli (E. coli) / References: UniProt: V6FZ95
#11: Protein 30S ribosomal protein S15


Mass: 9944.415 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: UniProt: Q8X9M2, UniProt: P0ADZ4*PLUS
#12: Protein 30S RIBOSOMAL PROTEIN bS16


Mass: 8936.237 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: UniProt: S0UHH0, UniProt: P0A7T3*PLUS
#13: Protein 30S ribosomal protein S17


Mass: 9164.815 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: UniProt: A0A0G3QJD8, UniProt: P0AG63*PLUS
#14: Protein 30S ribosomal protein S18


Mass: 6109.118 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (E. coli) / Gene: rpsR, HMPREF9534_03906 / Production host: Escherichia coli (E. coli) / References: UniProt: D7ZI16
#15: Protein 30S ribosomal protein S20


Mass: 9506.190 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (E. coli) / Gene: rpsT, G749_00187 / Production host: Escherichia coli (E. coli) / References: UniProt: T6N332, UniProt: P0A7U7*PLUS
#16: Protein 30S ribosomal protein S2


Mass: 24122.750 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (E. coli) / Gene: rpsB, HMPREF1620_04659 / Production host: Escherichia coli (E. coli) / References: UniProt: U9ZNW8, UniProt: P0A7V0*PLUS

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RNA chain / Non-polymers , 2 types, 2 molecules A

#17: Chemical ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Mg
#5: RNA chain 16S RIBOSOMAL RNA


Mass: 499690.031 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)

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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: 30S assembly intermediate (class P) / Type: RIBOSOME
Details: 30S assembly intermediate (class P) purified from Era-depleted E.coli cells
Entity ID: #1-#16 / Source: NATURAL
Molecular weightValue: 0.9 MDa / Experimental value: NO
Source (natural)Organism: Escherichia coli (E. coli) / Strain: K-12
Buffer solutionpH: 7.5
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportDetails: 5 mA / Grid material: COPPER / Grid mesh size: 200 divisions/in. / Grid type: C-flat-2/2
VitrificationInstrument: FEI VITROBOT MARK III / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 298.15 K

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal magnification: 75000 X / Nominal defocus max: 2750 nm / Nominal defocus min: 1250 nm / Cs: 2.7 mm / C2 aperture diameter: 100 µm / Alignment procedure: COMA FREE
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingElectron dose: 35 e/Å2 / Detector mode: INTEGRATING / Film or detector model: FEI FALCON II (4k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.13_2998: / Classification: refinement
EM software
IDNameVersionCategory
1RELION2.1.0.particle selection
2EPUimage acquisition
4GctfCTF correction
10RELION2.1.0.initial Euler assignment
11RELION2.1.0.final Euler assignment
12RELION2.1.0.classification
13RELION2.1.0.3D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 847135
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 3.8 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 423567 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00646213
ELECTRON MICROSCOPYf_angle_d0.95569052
ELECTRON MICROSCOPYf_dihedral_angle_d16.2224755
ELECTRON MICROSCOPYf_chiral_restr0.0478824
ELECTRON MICROSCOPYf_plane_restr0.0063762

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