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Entry
Database: EMDB / ID: EMD-1143
TitleStructure of the E. coli protein-conducting channel bound to a translating ribosome.
Map dataEM map of the E.coli proten-conducting channel bound to a translating ribosome
Sample
  • Sample: co-translational E. coli 70S ribosome-nascent chain complexed with SecYEG
  • Complex: 30S
  • Complex: 50S
  • RNA: A-site tRNA
  • RNA: P-site tRNA
  • RNA: E-site tRNA
  • RNA: mRNAMessenger RNA
  • Protein or peptide: protein-conducting channel
  • Protein or peptide: nascent chain
Function / homology
Function and homology information


protein insertion into membrane from inner side / cell envelope Sec protein transport complex / protein transport by the Sec complex / intracellular protein transmembrane transport / protein-transporting ATPase activity / SRP-dependent cotranslational protein targeting to membrane, translocation / signal sequence binding / stringent response / mRNA base-pairing translational repressor activity / ornithine decarboxylase inhibitor activity ...protein insertion into membrane from inner side / cell envelope Sec protein transport complex / protein transport by the Sec complex / intracellular protein transmembrane transport / protein-transporting ATPase activity / SRP-dependent cotranslational protein targeting to membrane, translocation / signal sequence binding / stringent response / mRNA base-pairing translational repressor activity / ornithine decarboxylase inhibitor activity / misfolded RNA binding / transcription antitermination factor activity, RNA binding / Group I intron splicing / RNA folding / protein transmembrane transporter activity / protein secretion / transcriptional attenuation / protein targeting / endoribonuclease inhibitor activity / RNA-binding transcription regulator activity / positive regulation of ribosome biogenesis / negative regulation of cytoplasmic translation / translational termination / DnaA-L2 complex / negative regulation of translational initiation / four-way junction DNA binding / translation repressor activity / negative regulation of DNA-templated DNA replication initiation / regulation of mRNA stability / ribosome assembly / mRNA regulatory element binding translation repressor activity / response to reactive oxygen species / assembly of large subunit precursor of preribosome / transcription elongation factor complex / positive regulation of RNA splicing / cytosolic ribosome assembly / regulation of DNA-templated transcription elongation / transcription antitermination / DNA endonuclease activity / regulation of cell growth / DNA-templated transcription termination / maintenance of translational fidelity / : / intracellular protein transport / response to radiation / mRNA 5'-UTR binding / ribosomal small subunit biogenesis / ribosomal small subunit assembly / small ribosomal subunit rRNA binding / cytosolic small ribosomal subunit / large ribosomal subunit rRNA binding / regulation of translation / ribosome biogenesis / ribosome binding / large ribosomal subunit / 5S rRNA binding / ribosomal large subunit assembly / cytosolic large ribosomal subunit / small ribosomal subunit / cytoplasmic translation / transferase activity / tRNA binding / negative regulation of translation / membrane => GO:0016020 / molecular adaptor activity / ribosome / rRNA binding / structural constituent of ribosome / translation / response to antibiotic / mRNA binding / negative regulation of DNA-templated transcription / protein homodimerization activity / DNA binding / RNA binding / zinc ion binding / membrane / plasma membrane / cytosol / cytoplasm
Similarity search - Function
Preprotein translocase SecG subunit / Preprotein translocase SecG subunit / SecE subunit of protein translocation complex, bacterial-like / SecE superfamily / Protein translocase subunit SecY / Protein secE/sec61-gamma signature. / Ribosomal protein L7/L12, oligomerisation / Ribosomal protein L7/L12, oligomerisation domain superfamily / Ribosomal protein L7/L12 dimerisation domain / Protein secY signature 1. ...Preprotein translocase SecG subunit / Preprotein translocase SecG subunit / SecE subunit of protein translocation complex, bacterial-like / SecE superfamily / Protein translocase subunit SecY / Protein secE/sec61-gamma signature. / Ribosomal protein L7/L12, oligomerisation / Ribosomal protein L7/L12, oligomerisation domain superfamily / Ribosomal protein L7/L12 dimerisation domain / Protein secY signature 1. / Protein secY signature 2. / Ribosomal protein L7/L12 / Ribosomal protein L7/L12, C-terminal / Ribosomal protein L7/L12 C-terminal domain / SecE/Sec61-gamma subunits of protein translocation complex / Protein translocase complex, SecE/Sec61-gamma subunit / SecY/SEC61-alpha family / SecY domain superfamily / SecY conserved site / SecY / Ribosomal protein L7/L12, C-terminal/adaptor protein ClpS-like / Ribosomal protein L1, bacterial-type / Ribosomal protein L1, conserved site / Ribosomal protein L1 signature. / Ribosomal protein L1 / Ribosomal protein L1, 3-layer alpha/beta-sandwich / Ribosomal protein L25, short-form / Ribosomal protein S14, bacterial/plastid / Ribosomal protein L11, bacterial-type / Ribosomal protein L1-like / Ribosomal protein L1/ribosomal biogenesis protein / Ribosomal protein L1p/L10e family / Ribosomal protein S16, conserved site / Ribosomal protein S16 signature. / Ribosomal protein L11, conserved site / Ribosomal protein L11 signature. / Ribosomal protein L16 signature 1. / : / Ribosomal protein L6, conserved site / Ribosomal protein L6 signature 1. / Ribosomal protein L16, conserved site / Ribosomal protein L16 signature 2. / Ribosomal protein L17 signature. / Ribosomal protein L9 signature. / Ribosomal protein L9, bacteria/chloroplast / Ribosomal protein L9, C-terminal / Ribosomal protein L9, C-terminal domain / Ribosomal protein L9, C-terminal domain superfamily / Ribosomal L25p family / Ribosomal protein L25 / Ribosomal protein L11, N-terminal / Ribosomal protein L11, N-terminal domain / Ribosomal protein L11/L12 / Ribosomal protein L11, C-terminal / Ribosomal protein L11, C-terminal domain superfamily / Ribosomal protein L11/L12, N-terminal domain superfamily / Ribosomal protein L11, RNA binding domain / Ribosomal protein L11/L12 / Ribosomal protein L25/Gln-tRNA synthetase, N-terminal / Ribosomal protein L32p, bacterial type / Ribosomal protein L25/Gln-tRNA synthetase, anti-codon-binding domain superfamily / Ribosomal protein L9, N-terminal domain superfamily / Ribosomal protein L9 / Ribosomal protein L9, N-terminal / Ribosomal protein L9, N-terminal domain / Ribosomal protein L33, conserved site / Ribosomal protein L33 signature. / Ribosomal protein L5, bacterial-type / Ribosomal protein L6, bacterial-type / Ribosomal protein L18, bacterial-type / Ribosomal protein L19, conserved site / Ribosomal protein L19 signature. / Ribosomal protein L9/RNase H1, N-terminal / Ribosomal protein L20 signature. / Ribosomal protein S3, bacterial-type / Ribosomal protein L27, conserved site / Ribosomal protein S6, conserved site / Ribosomal protein L27 signature. / Ribosomal protein S6 signature. / Ribosomal protein S19, bacterial-type / Ribosomal protein S7, bacterial/organellar-type / Ribosomal protein S11, bacterial-type / Ribosomal protein S13, bacterial-type / Ribosomal protein S20 / Ribosomal protein S20 superfamily / Ribosomal protein S20 / Ribosomal protein S9, bacterial/plastid / Ribosomal protein L14P, bacterial-type / Ribosomal protein S4, bacterial-type / 30S ribosomal protein S17 / Ribosomal protein S5, bacterial-type / Ribosomal protein L22, bacterial/chloroplast-type / Ribosomal protein S6, plastid/chloroplast / Ribosomal protein L2, bacterial/organellar-type / Ribosomal protein S2, bacteria/mitochondria/plastid / Ribosomal protein L33 / Ribosomal protein L33 / Ribosomal protein L33 superfamily / : / Ribosomal protein L30, bacterial-type
Similarity search - Domain/homology
Small ribosomal subunit protein bS6 / Small ribosomal subunit protein uS7 / Large ribosomal subunit protein uL15 / Protein translocase subunit SecY / Large ribosomal subunit protein uL11 / Large ribosomal subunit protein bL12 / Large ribosomal subunit protein bL19 / Large ribosomal subunit protein uL1 / Large ribosomal subunit protein bL20 / Large ribosomal subunit protein bL27 ...Small ribosomal subunit protein bS6 / Small ribosomal subunit protein uS7 / Large ribosomal subunit protein uL15 / Protein translocase subunit SecY / Large ribosomal subunit protein uL11 / Large ribosomal subunit protein bL12 / Large ribosomal subunit protein bL19 / Large ribosomal subunit protein uL1 / Large ribosomal subunit protein bL20 / Large ribosomal subunit protein bL27 / Large ribosomal subunit protein uL29 / Large ribosomal subunit protein bL32 / Large ribosomal subunit protein bL33 / Large ribosomal subunit protein bL9 / Small ribosomal subunit protein uS10 / Small ribosomal subunit protein uS11 / Small ribosomal subunit protein uS12 / Small ribosomal subunit protein uS13 / Small ribosomal subunit protein bS16 / Small ribosomal subunit protein bS18 / Small ribosomal subunit protein uS19 / 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 uS8 / Small ribosomal subunit protein uS9 / Large ribosomal subunit protein uL13 / Large ribosomal subunit protein uL14 / Large ribosomal subunit protein uL16 / Large ribosomal subunit protein uL23 / Small ribosomal subunit protein uS15 / Large ribosomal subunit protein bL17 / Large ribosomal subunit protein uL30 / Large ribosomal subunit protein uL6 / Small ribosomal subunit protein uS14 / Small ribosomal subunit protein uS17 / Protein translocase subunit SecE / Protein-export membrane protein SecG / Protein translocase subunit SecY / Large ribosomal subunit protein uL18 / Protein translocase subunit SecE / Protein-export membrane protein SecG / 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 / Large ribosomal subunit protein uL5 / Large ribosomal subunit protein bL25
Similarity search - Component
Biological speciesEscherichia coli (E. coli) / unidentified (others)
Methodsingle particle reconstruction / cryo EM / Resolution: 14.9 Å
AuthorsMitra K / Schaffitzel C / Shaikh T / Tama F / Jenni S / Brooks III CL / Ban N / Frank J
CitationJournal: Nature / Year: 2005
Title: Structure of the E. coli protein-conducting channel bound to a translating ribosome.
Authors: Kakoli Mitra / Christiane Schaffitzel / Tanvir Shaikh / Florence Tama / Simon Jenni / Charles L Brooks / Nenad Ban / Joachim Frank /
Abstract: Secreted and membrane proteins are translocated across or into cell membranes through a protein-conducting channel (PCC). Here we present a cryo-electron microscopy reconstruction of the Escherichia ...Secreted and membrane proteins are translocated across or into cell membranes through a protein-conducting channel (PCC). Here we present a cryo-electron microscopy reconstruction of the Escherichia coli PCC, SecYEG, complexed with the ribosome and a nascent chain containing a signal anchor. This reconstruction shows a messenger RNA, three transfer RNAs, the nascent chain, and detailed features of both a translocating PCC and a second, non-translocating PCC bound to mRNA hairpins. The translocating PCC forms connections with ribosomal RNA hairpins on two sides and ribosomal proteins at the back, leaving a frontal opening. Normal mode-based flexible fitting of the archaeal SecYEbeta structure into the PCC electron microscopy densities favours a front-to-front arrangement of two SecYEG complexes in the PCC, and supports channel formation by the opening of two linked SecY halves during polypeptide translocation. On the basis of our observation in the translocating PCC of two segregated pores with different degrees of access to bulk lipid, we propose a model for co-translational protein translocation.
History
DepositionAug 3, 2005-
Header (metadata) releaseAug 3, 2005-
Map releaseJun 13, 2006-
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: 50
  • Imaged by UCSF Chimera
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  • Surface view colored by height
  • Surface level: 50
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-2akh, PDB-2aki, PDB-4v4w
  • Surface level: 50
  • Imaged by UCSF Chimera
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  • Simplified surface model + fitted atomic model
  • Atomic modelsPDB-2akh
  • Imaged by Jmol
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  • Simplified surface model + fitted atomic model
  • Atomic modelsPDB-2aki
  • Imaged by Jmol
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  • Simplified surface model + fitted atomic model
  • Atomic modelsPDB-4v4w
  • Imaged by Jmol
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

Downloads & links

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Map

FileDownload / File: emd_1143.map.gz / Format: CCP4 / Size: 6.6 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationEM map of the E.coli proten-conducting channel bound to a translating ribosome
Voxel size
XYZ
EMDB info.2.822.822.82
CCP4 map header2.822.822.82
EM Navigator Movie #13.593.593.59
Density
Contour Level1: 46.100000000000001 / Movie #1: 50
Minimum - Maximum-299.713999999999999 - 454.814999999999998
Average (Standard dev.)5.83623 (±33.8063)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin-60-60-60
Dimensions121121121
Spacing121121121
CellA=B=C: 341.22 Å
α=β=γ: 90 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z2.822.822.82
M x/y/z121121121
origin x/y/z0.0000.0000.000
length x/y/z341.220341.220341.220
α/β/γ90.00090.00090.000
start NX/NY/NZ-90-90-190
NX/NY/NZ180180380
MAP C/R/S123
start NC/NR/NS-60-60-60
NC/NR/NS121121121
D min/max/mean-299.714454.8155.836

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Supplemental data

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Sample components

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Entire : co-translational E. coli 70S ribosome-nascent chain complexed wit...

EntireName: co-translational E. coli 70S ribosome-nascent chain complexed with SecYEG
Components
  • Sample: co-translational E. coli 70S ribosome-nascent chain complexed with SecYEG
  • Complex: 30S
  • Complex: 50S
  • RNA: A-site tRNA
  • RNA: P-site tRNA
  • RNA: E-site tRNA
  • RNA: mRNAMessenger RNA
  • Protein or peptide: protein-conducting channel
  • Protein or peptide: nascent chain

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Supramolecule #1000: co-translational E. coli 70S ribosome-nascent chain complexed wit...

SupramoleculeName: co-translational E. coli 70S ribosome-nascent chain complexed with SecYEG
type: sample / ID: 1000 / Number unique components: 8

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Supramolecule #1: 30S

SupramoleculeName: 30S / type: complex / ID: 1 / Name.synonym: small subunit / Recombinant expression: No / Ribosome-details: ribosome-prokaryote: SSU 30S
Source (natural)Organism: Escherichia coli (E. coli)

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Supramolecule #2: 50S

SupramoleculeName: 50S / type: complex / ID: 2 / Name.synonym: large subunit / Recombinant expression: No / Ribosome-details: ribosome-prokaryote: LSU 50S
Source (natural)Organism: Escherichia coli (E. coli)

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Macromolecule #1: A-site tRNA

MacromoleculeName: A-site tRNA / type: rna / ID: 1 / Classification: OTHER / Structure: DOUBLE HELIX / Synthetic?: No
Source (natural)Organism: Escherichia coli (E. coli)

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Macromolecule #2: P-site tRNA

MacromoleculeName: P-site tRNA / type: rna / ID: 2 / Classification: OTHER / Structure: DOUBLE HELIX / Synthetic?: No
Source (natural)Organism: Escherichia coli (E. coli)

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Macromolecule #3: E-site tRNA

MacromoleculeName: E-site tRNA / type: rna / ID: 3 / Classification: OTHER / Structure: DOUBLE HELIX / Synthetic?: No
Source (natural)Organism: Escherichia coli (E. coli)

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Macromolecule #4: mRNA

MacromoleculeName: mRNA / type: rna / ID: 4 / Classification: OTHER / Structure: SINGLE STRANDED / Synthetic?: Yes
Source (natural)Organism: Escherichia coli (E. coli)

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Macromolecule #5: protein-conducting channel

MacromoleculeName: protein-conducting channel / type: protein_or_peptide / ID: 5 / Name.synonym: translocon, SecYEG / Number of copies: 2 / Oligomeric state: dimer of heterotrimer / Recombinant expression: Yes
Source (natural)Organism: Escherichia coli (E. coli) / synonym: translocon / Location in cell: inner membrane
Recombinant expressionOrganism: Escherichia coli (E. coli)

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Macromolecule #6: nascent chain

MacromoleculeName: nascent chain / type: protein_or_peptide / ID: 6 / Details: Strep-II-FtsQ-SecM construct / Recombinant expression: Yes
Source (natural)Organism: unidentified (others) / synonym: translocon

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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

VitrificationCryogen name: ETHANE / Chamber humidity: 90 % / Chamber temperature: 93 K / Instrument: HOMEMADE PLUNGER
Details: Vitrification instrument: two sided blotting plunger
Method: Blot for 2 seconds before plunging

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Electron microscopy

MicroscopeFEI TECNAI F30
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsCalibrated magnification: 39000 / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELDBright-field microscopy / Cs: 2.26 mm / Nominal defocus max: 4.3 µm / Nominal defocus min: 1.5 µm / Nominal magnification: 39000
Sample stageSpecimen holder: Cryo stage / Specimen holder model: OTHER
TemperatureAverage: 93 K
DateMar 9, 2004
Image recordingCategory: FILM / Film or detector model: KODAK SO-163 FILM / Digitization - Scanner: ZEISS SCAI / Digitization - Sampling interval: 14 µm / Number real images: 385 / Average electron dose: 11 e/Å2 / Od range: 1.2 / Bits/pixel: 12
Experimental equipment
Model: Tecnai F30 / Image courtesy: FEI Company

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Image processing

CTF correctionDetails: defocus groups
Final angle assignmentDetails: SPIDER: theta 15 degrees, phi 15 degrees
Final reconstructionApplied symmetry - Point group: C1 (asymmetric) / Algorithm: OTHER / Resolution.type: BY AUTHOR / Resolution: 14.9 Å / Resolution method: FSC 0.5 CUT-OFF / Software - Name: SPIDER package
Details: The falloff of Fourier amplitudes toward higher spatial frequencies was corrected using the x-ray solution scattering intensity distribution of 70S ribosomes from E. coli during each round of refinement
Number images used: 53325

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Atomic model buiding 1

DetailsProtocol: normal mode-based flexible fitting. Fitting of SecYEG atomic model into isolated EM density of protein-conducting channels
RefinementSpace: REAL / Protocol: FLEXIBLE FIT / Target criteria: correlation coefficient
Output model

PDB-2akh:
Normal mode-based flexible fitted coordinates of a non-translocating SecYEG protein-conducting channel into the cryo-EM map of a SecYEG-nascent chain-70S ribosome complex from E. coli

PDB-2aki:
Normal mode-based flexible fitted coordinates of a translocating SecYEG protein-conducting channel into the cryo-EM map of a SecYEG-nascent chain-70S ribosome complex from E. coli

PDB-4v4w:
Structure of a SecM-stalled E. coli ribosome complex obtained by fitting atomic models for RNA and protein components into cryo-EM map EMD-1143

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Atomic model buiding 2

DetailsProtocol: normal mode-based flexible fitting. Fitting of SecYEG atomic model into isolated EM density of protein-conducting channels
RefinementSpace: REAL / Protocol: FLEXIBLE FIT / Target criteria: correlation coefficient
Output model

PDB-2akh:
Normal mode-based flexible fitted coordinates of a non-translocating SecYEG protein-conducting channel into the cryo-EM map of a SecYEG-nascent chain-70S ribosome complex from E. coli

PDB-2aki:
Normal mode-based flexible fitted coordinates of a translocating SecYEG protein-conducting channel into the cryo-EM map of a SecYEG-nascent chain-70S ribosome complex from E. coli

PDB-4v4w:
Structure of a SecM-stalled E. coli ribosome complex obtained by fitting atomic models for RNA and protein components into cryo-EM map EMD-1143

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Atomic model buiding 3

SoftwareName: RSR2000
DetailsProtocol: real space refinement
RefinementSpace: REAL / Protocol: RIGID BODY FIT / Target criteria: R-factor
Output model

PDB-2akh:
Normal mode-based flexible fitted coordinates of a non-translocating SecYEG protein-conducting channel into the cryo-EM map of a SecYEG-nascent chain-70S ribosome complex from E. coli

PDB-2aki:
Normal mode-based flexible fitted coordinates of a translocating SecYEG protein-conducting channel into the cryo-EM map of a SecYEG-nascent chain-70S ribosome complex from E. coli

PDB-4v4w:
Structure of a SecM-stalled E. coli ribosome complex obtained by fitting atomic models for RNA and protein components into cryo-EM map EMD-1143

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Atomic model buiding 4

SoftwareName: RSR2000
DetailsProtocol: real space refinement
RefinementSpace: REAL / Protocol: RIGID BODY FIT / Target criteria: R-factor
Output model

PDB-2akh:
Normal mode-based flexible fitted coordinates of a non-translocating SecYEG protein-conducting channel into the cryo-EM map of a SecYEG-nascent chain-70S ribosome complex from E. coli

PDB-2aki:
Normal mode-based flexible fitted coordinates of a translocating SecYEG protein-conducting channel into the cryo-EM map of a SecYEG-nascent chain-70S ribosome complex from E. coli

PDB-4v4w:
Structure of a SecM-stalled E. coli ribosome complex obtained by fitting atomic models for RNA and protein components into cryo-EM map EMD-1143

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