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- PDB-6w7m: 30S-Inactive-high-Mg2+ + carbon layer -

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Basic information

Entry
Database: PDB / ID: 6w7m
Title30S-Inactive-high-Mg2+ + carbon layer
Components
  • (30S ribosomal protein ...) x 19
  • 16S rRNA
KeywordsRIBOSOME / 30S subunit / conformations / inactive / activated
Function / homology
Function and homology information


mRNA binding involved in posttranscriptional gene silencing / ornithine decarboxylase inhibitor activity / misfolded RNA binding / RNA folding / Group I intron splicing / transcription antitermination factor activity, RNA binding / transcription antitermination / negative regulation of translational initiation / four-way junction DNA binding / translation repressor activity, mRNA regulatory element binding ...mRNA binding involved in posttranscriptional gene silencing / ornithine decarboxylase inhibitor activity / misfolded RNA binding / RNA folding / Group I intron splicing / transcription antitermination factor activity, RNA binding / transcription antitermination / negative regulation of translational initiation / four-way junction DNA binding / translation repressor activity, mRNA regulatory element binding / endodeoxyribonuclease activity / positive regulation of RNA splicing / DNA-templated transcription, termination / positive regulation of translational fidelity / maintenance of translational fidelity / small ribosomal subunit rRNA binding / ribosomal small subunit assembly / maturation of SSU-rRNA from tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / mRNA 5'-UTR binding / cytosolic small ribosomal subunit / regulation of translation / regulation of mRNA stability / small ribosomal subunit / negative regulation of translation / tRNA binding / rRNA binding / ribosome / structural constituent of ribosome / translation / mRNA binding / response to antibiotic / RNA binding / zinc ion binding / membrane / cytosol
K homology domain superfamily, prokaryotic type / Ribosomal protein S2, bacteria/mitochondria/plastid / Ribosomal protein S13-like, H2TH / S15/NS1, RNA-binding / Ribosomal protein S9, bacterial/plastid / Ribosomal protein S12/S23 / Ribosomal protein S19, bacterial-type / Ribosomal protein S7, bacterial/organellar-type / Ribosomal protein S5, bacterial-type / Ribosomal protein S4, bacterial-type ...K homology domain superfamily, prokaryotic type / Ribosomal protein S2, bacteria/mitochondria/plastid / Ribosomal protein S13-like, H2TH / S15/NS1, RNA-binding / Ribosomal protein S9, bacterial/plastid / Ribosomal protein S12/S23 / Ribosomal protein S19, bacterial-type / Ribosomal protein S7, bacterial/organellar-type / Ribosomal protein S5, bacterial-type / Ribosomal protein S4, bacterial-type / Ribosomal protein S3, bacterial-type / Ribosomal protein S5, N-terminal / Ribosomal protein S12, bacterial-type / Ribosomal protein S5, C-terminal / Ribosomal protein S15, bacterial-type / K Homology domain / K Homology domain, type 2 / RNA-binding S4 domain / Ribosomal protein S20 / Ribosomal protein S19/S15 / Ribosomal protein S11 / Nucleic acid-binding, OB-fold / Translation elongation factor EF1B/ribosomal protein S6 / Ribosomal protein S13 / Ribosomal protein S17, conserved site / Ribosomal protein S6, conserved site / Ribosomal protein S6, plastid/chloroplast / Ribosomal protein S7, conserved site / Ribosomal protein S16, conserved site / Ribosomal protein S9, conserved site / Ribosomal protein S5 domain 2-type fold / 30S ribosomal protein S17 / Ribosomal protein S11, bacterial-type / Ribosomal protein S13, bacterial-type / Ribosomal protein S3, conserved site / Ribosomal protein S5 domain 2-type fold, subgroup / Ribosomal protein S18, conserved site / Ribosomal protein S14, conserved site / Ribosomal protein S13, conserved site / Ribosomal protein S10, conserved site / Ribosomal protein S5, N-terminal, conserved site / Ribosomal protein S2, conserved site / Ribosomal S11, conserved site / Ribosomal protein S4, conserved site / K homology domain-like, alpha/beta / Ribosomal protein S4/S9, N-terminal / Ribosomal protein S2 / Ribosomal protein S4/S9 / Ribosomal protein S3, C-terminal domain superfamily / Ribosomal protein S7 domain / Ribosomal protein S16 domain superfamily / 30s ribosomal protein S13, C-terminal / Ribosomal protein S10 domain / Ribosomal protein S6 superfamily / Ribosomal protein S8 superfamily / Ribosomal protein S20 superfamily / Ribosomal protein S2, flavodoxin-like domain superfamily / Ribosomal protein S7 domain superfamily / Ribosomal protein S10 domain superfamily / Ribosomal protein S18 superfamily / Ribosomal protein S11 superfamily / RNA-binding S4 domain superfamily / Ribosomal protein S14/S29 / Ribosomal protein S10 / Ribosomal protein S19 conserved site / Ribosomal protein S6 / Ribosomal protein S5 / Ribosomal protein S9 / Ribosomal protein S8 / Ribosomal protein S3, C-terminal / Ribosomal protein S15 / Ribosomal protein S16 / Ribosomal protein S17/S11 / Ribosomal protein S5/S7 / Ribosomal protein S14, bacterial/plastid / Ribosomal protein S18 / Ribosomal protein S19, superfamily / Ribosomal protein S14
30S ribosomal protein S17 / 30S ribosomal protein S2 / 30S ribosomal protein S14 / 30S ribosomal protein S15 / 30S ribosomal protein S9 / 30S ribosomal protein S8 / 30S ribosomal protein S5 / 30S ribosomal protein S4 / 30S ribosomal protein S3 / 30S ribosomal protein S7 ...30S ribosomal protein S17 / 30S ribosomal protein S2 / 30S ribosomal protein S14 / 30S ribosomal protein S15 / 30S ribosomal protein S9 / 30S ribosomal protein S8 / 30S ribosomal protein S5 / 30S ribosomal protein S4 / 30S ribosomal protein S3 / 30S ribosomal protein S7 / 30S ribosomal protein S20 / 30S ribosomal protein S19 / 30S ribosomal protein S18 / 30S ribosomal protein S16 / 30S ribosomal protein S13 / 30S ribosomal protein S12 / 30S ribosomal protein S11 / 30S ribosomal protein S10 / 30S ribosomal protein S6 / gb:1789840096:
Biological speciesEscherichia coli (E. coli)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.8 Å
AuthorsJahagirdar, D. / Jha, V. / Basu, B. / Gomez-Blanco, J. / Vargas, J. / Ortega, J.
Funding support Canada, 1items
OrganizationGrant numberCountry
Canadian Institutes of Health Research (CIHR)CIHR PJT- 153044 Canada
CitationJournal: RNA / Year: 2020
Title: Alternative conformations and motions adopted by 30S ribosomal subunits visualized by cryo-electron microscopy.
Authors: Dushyant Jahagirdar / Vikash Jha / Kaustuv Basu / Josue Gomez-Blanco / Javier Vargas / Joaquin Ortega /
Abstract: It is only after recent advances in cryo-electron microscopy that it is now possible to describe at high-resolution structures of large macromolecules that do not crystalize. Purified 30S subunits ...It is only after recent advances in cryo-electron microscopy that it is now possible to describe at high-resolution structures of large macromolecules that do not crystalize. Purified 30S subunits interconvert between an "active" and "inactive" conformation. The active conformation was described by crystallography in the early 2000s, but the structure of the inactive form at high resolution remains unsolved. Here we used cryo-electron microscopy to obtain the structure of the inactive conformation of the 30S subunit to 3.6 Å resolution and study its motions. In the inactive conformation, an alternative base-pairing of three nucleotides causes the region of helix 44, forming the decoding center to adopt an unlatched conformation and the 3' end of the 16S rRNA positions similarly to the mRNA during translation. Incubation of inactive 30S subunits at 42°C reverts these structural changes. The air-water interface to which ribosome subunits are exposed during sample preparation also peel off some ribosomal proteins. Extended exposures to low magnesium concentrations make the ribosomal particles more susceptible to the air-water interface causing the unfolding of large rRNA structural domains. Overall, this study provides new insights about the conformational space explored by the 30S ribosomal subunit when the ribosomal particles are free in solution.
Validation Report
SummaryFull reportAbout validation report
History
DepositionMar 19, 2020Deposition site: RCSB / Processing site: RCSB
Revision 1.0Oct 21, 2020Provider: repository / Type: Initial release
Revision 1.1Dec 2, 2020Group: Database references / Category: citation / citation_author
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _citation.title / _citation_author.identifier_ORCID

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Structure visualization

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Assembly

Deposited unit
A: 16S rRNA
B: 30S ribosomal protein S2
C: 30S ribosomal protein S3
D: 30S ribosomal protein S4
E: 30S ribosomal protein S5
F: 30S ribosomal protein S6
G: 30S ribosomal protein S7
H: 30S ribosomal protein S8
I: 30S ribosomal protein S9
J: 30S ribosomal protein S10
K: 30S ribosomal protein S11
L: 30S ribosomal protein S12
M: 30S ribosomal protein S13
N: 30S ribosomal protein S14
O: 30S ribosomal protein S15
P: 30S ribosomal protein S16
Q: 30S ribosomal protein S17
R: 30S ribosomal protein S18
S: 30S ribosomal protein S19
T: 30S ribosomal protein S20


Theoretical massNumber of molelcules
Total (without water)780,98420
Polymers780,98420
Non-polymers00
Water0
1


TypeNameSymmetry operationNumber
identity operation1_5551
Buried area79670 Å2
ΔGint-702 kcal/mol
Surface area300050 Å2

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Components

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RNA chain , 1 types, 1 molecules A

#1: RNA chain 16S rRNA


Mass: 499690.031 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (strain K12) (bacteria) / Strain: K12 / References: GenBank: 1789840096

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30S ribosomal protein ... , 19 types, 19 molecules BCDEFGHIJKLMNOPQRST

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


Mass: 26781.670 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (strain K12) (bacteria) / Strain: K12 / References: UniProt: P0A7V0
#3: Protein 30S ribosomal protein S3 / / Small ribosomal subunit protein uS3


Mass: 26031.316 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (strain K12) (bacteria) / Strain: K12 / References: UniProt: P0A7V3
#4: Protein 30S ribosomal protein S4 / / Small ribosomal subunit protein uS4


Mass: 23514.199 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (strain K12) (bacteria) / Strain: K12 / References: UniProt: P0A7V8
#5: Protein 30S ribosomal protein S5 / / Small ribosomal subunit protein uS5


Mass: 17629.398 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (strain K12) (bacteria) / Strain: K12 / References: UniProt: P0A7W1
#6: Protein 30S ribosomal protein S6 / / Small ribosomal subunit protein bS6


Mass: 15727.512 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (strain K12) (bacteria) / Strain: K12 / References: UniProt: P02358
#7: Protein 30S ribosomal protein S7 / / Small ribosomal subunit protein uS7


Mass: 20055.156 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (strain K12) (bacteria) / Strain: K12 / References: UniProt: P02359
#8: Protein 30S ribosomal protein S8 / / Small ribosomal subunit protein uS8


Mass: 14146.557 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (strain K12) (bacteria) / Strain: K12 / References: UniProt: P0A7W7
#9: Protein 30S ribosomal protein S9 / / Small ribosomal subunit protein uS9


Mass: 14886.270 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (strain K12) (bacteria) / Strain: K12 / References: UniProt: P0A7X3
#10: Protein 30S ribosomal protein S10 / / Small ribosomal subunit protein uS10


Mass: 11755.597 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (strain K12) (bacteria) / Strain: K12 / References: UniProt: P0A7R5
#11: Protein 30S ribosomal protein S11 / / Small ribosomal subunit protein uS11


Mass: 13870.975 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (strain K12) (bacteria) / Strain: K12 / References: UniProt: P0A7R9
#12: Protein 30S ribosomal protein S12 /


Mass: 13768.157 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (strain K12) (bacteria) / Strain: K12 / References: UniProt: P0A7S3
#13: Protein 30S ribosomal protein S13 / / Small ribosomal subunit protein uS13


Mass: 13128.467 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (strain K12) (bacteria) / Strain: K12 / References: UniProt: P0A7S9
#14: Protein 30S ribosomal protein S14 / / Small ribosomal subunit protein uS14


Mass: 11606.560 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (strain K12) (bacteria) / Strain: K12 / References: UniProt: P0AG59
#15: Protein 30S ribosomal protein S15 / / Small ribosomal subunit protein uS15


Mass: 10290.816 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (strain K12) (bacteria) / Strain: K12 / References: UniProt: P0ADZ4
#16: Protein 30S ribosomal protein S16 / / Small ribosomal subunit protein bS16


Mass: 9207.572 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (strain K12) (bacteria) / Strain: K12 / References: UniProt: P0A7T3
#17: Protein 30S ribosomal protein S17 / / Small ribosomal subunit protein uS17


Mass: 9724.491 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (strain K12) (bacteria) / Strain: K12 / References: UniProt: P0AG63
#18: Protein 30S ribosomal protein S18 /


Mass: 9005.472 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (strain K12) (bacteria) / Strain: K12 / References: UniProt: P0A7T7
#19: Protein 30S ribosomal protein S19 /


Mass: 10455.355 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (strain K12) (bacteria) / Strain: K12 / References: UniProt: P0A7U3
#20: Protein 30S ribosomal protein S20 / / Small ribosomal subunit protein bS20


Mass: 9708.464 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (strain K12) (bacteria) / Strain: K12 / References: UniProt: P0A7U7

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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-Activated-high-Mg2+ / Type: RIBOSOME / Entity ID: #1-#20 / Source: NATURAL
Source (natural)Organism: Escherichia coli K-12 (bacteria)
Buffer solutionpH: 7.4
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: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELDBright-field microscopy
Specimen holderCryogen: NITROGEN / Model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingElectron dose: 52 e/Å2 / Detector mode: INTEGRATING / Film or detector model: FEI FALCON II (4k x 4k)

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Processing

EM software
IDNameVersionCategory
7UCSF Chimeramodel fitting
9PHENIXmodel refinement
13RELION33D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 3.8 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 334903 / Symmetry type: POINT
Atomic model buildingSpace: REAL
Atomic model buildingPDB-ID: 4V4Q

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