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- EMDB-1251: Structure of the E. coli signal recognition particle bound to a t... -

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Basic information

Entry
Database: EMDB / ID: EMD-1251
TitleStructure of the E. coli signal recognition particle bound to a translating ribosome.
Map dataThis is the map file of the E. coli signal recognition particle bound to a non-translating ribosome.
Sample
  • Sample: E. coli ribosome and signal recognition particle
  • Complex: E.coli 70S ribosome
  • Ligand: E.coli SRP
Function / homology
Function and homology information


signal recognition particle / signal-recognition-particle GTPase / 7S RNA binding / SRP-dependent cotranslational protein targeting to membrane / GTPase activity / GTP binding / ATP hydrolysis activity
Similarity search - Function
Signal recognition particle protein / SRP/SRP receptor, N-terminal / Signal recognition particle, SRP54 subunit / Signal recognition particle, SRP54 subunit, M-domain / Signal recognition particle, SRP54 subunit, M-domain superfamily / Signal peptide binding domain / SRP54-type proteins GTP-binding domain signature. / Signal recognition particle SRP54, helical bundle / Signal recognition particle SRP54, N-terminal domain superfamily / SRP54-type protein, helical bundle domain ...Signal recognition particle protein / SRP/SRP receptor, N-terminal / Signal recognition particle, SRP54 subunit / Signal recognition particle, SRP54 subunit, M-domain / Signal recognition particle, SRP54 subunit, M-domain superfamily / Signal peptide binding domain / SRP54-type proteins GTP-binding domain signature. / Signal recognition particle SRP54, helical bundle / Signal recognition particle SRP54, N-terminal domain superfamily / SRP54-type protein, helical bundle domain / SRP54-type protein, helical bundle domain / Signal recognition particle, SRP54 subunit, GTPase domain / SRP54-type protein, GTPase domain / SRP54-type protein, GTPase domain / ATPases associated with a variety of cellular activities / AAA+ ATPase domain / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
Signal recognition particle 54 kDa protein / Signal recognition particle protein
Similarity search - Component
Biological speciesEscherichia coli (E. coli)
Methodsingle particle reconstruction / cryo EM / Resolution: 20.0 Å
AuthorsSchaffitzel C / Oswald M / Berger I / Ishikawa T / Abrahams JP / Koerten HK / Koning RI / Ban N
CitationJournal: Nature / Year: 2006
Title: Structure of the E. coli signal recognition particle bound to a translating ribosome.
Authors: Christiane Schaffitzel / Miro Oswald / Imre Berger / Takashi Ishikawa / Jan Pieter Abrahams / Henk K Koerten / Roman I Koning / Nenad Ban /
Abstract: The prokaryotic signal recognition particle (SRP) targets membrane proteins into the inner membrane. It binds translating ribosomes and screens the emerging nascent chain for a hydrophobic signal ...The prokaryotic signal recognition particle (SRP) targets membrane proteins into the inner membrane. It binds translating ribosomes and screens the emerging nascent chain for a hydrophobic signal sequence, such as the transmembrane helix of inner membrane proteins. If such a sequence emerges, the SRP binds tightly, allowing the SRP receptor to lock on. This assembly delivers the ribosome-nascent chain complex to the protein translocation machinery in the membrane. Using cryo-electron microscopy and single-particle reconstruction, we obtained a 16 A structure of the Escherichia coli SRP in complex with a translating E. coli ribosome containing a nascent chain with a transmembrane helix anchor. We also obtained structural information on the SRP bound to an empty E. coli ribosome. The latter might share characteristics with a scanning SRP complex, whereas the former represents the next step: the targeting complex ready for receptor binding. High-resolution structures of the bacterial ribosome and of the bacterial SRP components are available, and their fitting explains our electron microscopic density. The structures reveal the regions that are involved in complex formation, provide insight into the conformation of the SRP on the ribosome and indicate the conformational changes that accompany high-affinity SRP binding to ribosome nascent chain complexes upon recognition of the signal sequence.
History
DepositionJul 29, 2006-
Header (metadata) releaseJul 29, 2006-
Map releaseJul 29, 2008-
UpdateOct 24, 2012-
Current statusOct 24, 2012Processing site: PDBe / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.25
  • Imaged by UCSF Chimera
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  • Surface view colored by height
  • Surface level: 0.25
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-2iy3
  • Surface level: 0.25
  • Imaged by UCSF Chimera
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  • Simplified surface model + fitted atomic model
  • Atomic modelsPDB-2iy3
  • Imaged by Jmol
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

1251.gif

Downloads & links

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Map

FileDownload / File: emd_1251.map.gz / Format: CCP4 / Size: 5 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationThis is the map file of the E. coli signal recognition particle bound to a non-translating ribosome.
Voxel sizeX=Y=Z: 3.81 Å
Density
Contour Level1: 0.926 / Movie #1: 0.25
Minimum - Maximum-2.74426 - 4.88095
Average (Standard dev.)-0.000000000234658 (±0.48842)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions110110110
Spacing110110110
CellA=B=C: 419.1 Å
α=β=γ: 90 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z3.813.813.81
M x/y/z110110110
origin x/y/z0.0000.0000.000
length x/y/z419.100419.100419.100
α/β/γ90.00090.00090.000
start NX/NY/NZ-64-64-64
NX/NY/NZ128128128
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS110110110
D min/max/mean-2.7444.881-0.000

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Supplemental data

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Sample components

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Entire : E. coli ribosome and signal recognition particle

EntireName: E. coli ribosome and signal recognition particle
Components
  • Sample: E. coli ribosome and signal recognition particle
  • Complex: E.coli 70S ribosome
  • Ligand: E.coli SRP

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Supramolecule #1000: E. coli ribosome and signal recognition particle

SupramoleculeName: E. coli ribosome and signal recognition particle / type: sample / ID: 1000 / Oligomeric state: One SRP binds to one ribosome. / Number unique components: 2

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Supramolecule #1: E.coli 70S ribosome

SupramoleculeName: E.coli 70S ribosome / type: complex / ID: 1 / Recombinant expression: No / Ribosome-details: ribosome-prokaryote: ALL
Source (natural)Organism: Escherichia coli (E. coli)
Molecular weightTheoretical: 2.5 MDa

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Macromolecule #1: E.coli SRP

MacromoleculeName: E.coli SRP / type: ligand / ID: 1 / Name.synonym: Signal rocognition particle / Number of copies: 1 / Oligomeric state: monomer / Recombinant expression: Yes
Source (natural)Organism: Escherichia coli (E. coli) / Location in cell: cytosol
Molecular weightTheoretical: 90 KDa
Recombinant expressionOrganism: Escherichia coli BL21(DE3) (bacteria) / Recombinant plasmid: pET24a_Ffh and pUC19_Ffs

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

Concentration0.375 mg/mL
BufferpH: 7.5
Details: 50mM Hepes-KOH pH7.5,100mM KCl,25mM MgCl2,1mM DTT,1mM GTP
GridDetails: carbon-coated lacey formvar grids
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 298 K / Instrument: HOMEMADE PLUNGER
Details: Vitrification instrument: home-built environmental chamber and vitrification device
Method: blot for 1.5 sec before plunging

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Electron microscopy

MicroscopeFEI TECNAI F20
Electron beamAcceleration voltage: 200 kV / Electron source: FIELD EMISSION GUN
Electron opticsCalibrated magnification: 51000 / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELDBright-field microscopy / Cs: 2 mm / Nominal defocus max: 4.5 µm / Nominal defocus min: 1.0 µm / Nominal magnification: 50000
Sample stageSpecimen holder: cryo stage / Specimen holder model: GATAN LIQUID NITROGEN
Image recordingCategory: FILM / Film or detector model: KODAK SO-163 FILM / Digitization - Scanner: OTHER / Number real images: 212 / Average electron dose: 10 e/Å2
Experimental equipment
Model: Tecnai F20 / Image courtesy: FEI Company

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Image processing

Final reconstructionApplied symmetry - Point group: C1 (asymmetric) / Resolution.type: BY AUTHOR / Resolution: 20.0 Å / Resolution method: FSC 0.5 CUT-OFF / Software - Name: spider / Number images used: 9300

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