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- EMDB-11775: Cryo-EM structure of the apo state post-translational Sec translocon -

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Basic information

Entry
Database: EMDB / ID: EMD-11775
TitleCryo-EM structure of the apo state post-translational Sec translocon
Map data
Sample
  • Complex: Apo state post-translational Sec translocon
Function / homology
Function and homology information


mating pheromone activity / mating / misfolded protein transport / Sec62/Sec63 complex / translocon complex / pheromone-dependent signal transduction involved in conjugation with cellular fusion / Insertion of tail-anchored proteins into the endoplasmic reticulum membrane / cytosol to endoplasmic reticulum transport / rough endoplasmic reticulum membrane / Ssh1 translocon complex ...mating pheromone activity / mating / misfolded protein transport / Sec62/Sec63 complex / translocon complex / pheromone-dependent signal transduction involved in conjugation with cellular fusion / Insertion of tail-anchored proteins into the endoplasmic reticulum membrane / cytosol to endoplasmic reticulum transport / rough endoplasmic reticulum membrane / Ssh1 translocon complex / Sec61 translocon complex / protein-transporting ATPase activity / post-translational protein targeting to endoplasmic reticulum membrane / filamentous growth / SRP-dependent cotranslational protein targeting to membrane, translocation / SRP-dependent cotranslational protein targeting to membrane / signal sequence binding / post-translational protein targeting to membrane, translocation / peptide transmembrane transporter activity / cupric ion binding / nuclear inner membrane / retrograde protein transport, ER to cytosol / protein transmembrane transporter activity / ERAD pathway / guanyl-nucleotide exchange factor activity / cell periphery / ribosome binding / endoplasmic reticulum membrane / structural molecule activity / endoplasmic reticulum / mitochondrion / extracellular region / membrane / cytosol
Similarity search - Function
Translocation protein Sec62, ascomycota / Translocation protein Sec62 / Translocation protein Sec62 / Mating factor alpha, C-terminal repeat / Mating factor alpha precursor, N-terminal / Yeast mating factor alpha hormone / Mating factor alpha precursor N-terminus / Translocation protein Sec66 / Preprotein translocase subunit Sec66 / Protein transport Sec61-beta/Sbh ...Translocation protein Sec62, ascomycota / Translocation protein Sec62 / Translocation protein Sec62 / Mating factor alpha, C-terminal repeat / Mating factor alpha precursor, N-terminal / Yeast mating factor alpha hormone / Mating factor alpha precursor N-terminus / Translocation protein Sec66 / Preprotein translocase subunit Sec66 / Protein transport Sec61-beta/Sbh / Protein transport protein SecG/Sec61-beta/Sbh / Sec61beta family / Protein translocase SEC61 complex, gamma subunit / Protein translocase SecE domain superfamily / Translocon Sec61/SecY, plug domain / Plug domain of Sec61p / Nt-dnaJ domain signature. / DnaJ domain, conserved site / Protein secE/sec61-gamma signature. / Protein secY signature 1. / Protein secY signature 2. / 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 / DnaJ domain / Sec63 domain / Sec63 Brl domain / DnaJ molecular chaperone homology domain / dnaJ domain profile. / Chaperone J-domain superfamily / DnaJ domain / Tetratricopeptide repeats / Tetratricopeptide repeat / Tetratricopeptide-like helical domain superfamily / Immunoglobulin E-set
Similarity search - Domain/homology
Mating factor alpha-1 / Protein translocation protein SEC63 / Translocation protein SEC62 / Protein transport protein SEC61 / Translocation protein SEC66 / Protein transport protein SSS1 / Translocation protein SEC72 / Protein transport protein SBH1
Similarity search - Component
Biological speciesSaccharomyces cerevisiae (brewer's yeast)
Methodsingle particle reconstruction / cryo EM / Resolution: 4.3 Å
AuthorsWeng T-H / Beatrix B / Berninghausen O / Becker T / Cheng J / Beckmann R
CitationJournal: EMBO J / Year: 2021
Title: Architecture of the active post-translational Sec translocon.
Authors: Tsai-Hsuan Weng / Wieland Steinchen / Birgitta Beatrix / Otto Berninghausen / Thomas Becker / Gert Bange / Jingdong Cheng / Roland Beckmann /
Abstract: In eukaryotes, most secretory and membrane proteins are targeted by an N-terminal signal sequence to the endoplasmic reticulum, where the trimeric Sec61 complex serves as protein-conducting channel ...In eukaryotes, most secretory and membrane proteins are targeted by an N-terminal signal sequence to the endoplasmic reticulum, where the trimeric Sec61 complex serves as protein-conducting channel (PCC). In the post-translational mode, fully synthesized proteins are recognized by a specialized channel additionally containing the Sec62, Sec63, Sec71, and Sec72 subunits. Recent structures of this Sec complex in the idle state revealed the overall architecture in a pre-opened state. Here, we present a cryo-EM structure of the yeast Sec complex bound to a substrate, and a crystal structure of the Sec62 cytosolic domain. The signal sequence is inserted into the lateral gate of Sec61α similar to previous structures, yet, with the gate adopting an even more open conformation. The signal sequence is flanked by two Sec62 transmembrane helices, the cytoplasmic N-terminal domain of Sec62 is more rigidly positioned, and the plug domain is relocated. We crystallized the Sec62 domain and mapped its interaction with the C-terminus of Sec63. Together, we obtained a near-complete and integrated model of the active Sec complex.
History
DepositionSep 20, 2020-
Header (metadata) releaseDec 2, 2020-
Map releaseDec 2, 2020-
UpdateFeb 10, 2021-
Current statusFeb 10, 2021Processing site: PDBe / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.018
  • Imaged by UCSF Chimera
  • Download
  • Surface view colored by height
  • Surface level: 0.018
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_11775.png

Downloads & links

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Map

FileDownload / File: emd_11775.map.gz / Format: CCP4 / Size: 30.5 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.06 Å/pix.
x 200 pix.
= 211.8 Å		1.06 Å/pix.
x 200 pix.
= 211.8 Å		1.06 Å/pix.
x 200 pix.
= 211.8 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.059 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.018 / Movie #1: 0.018
Minimum - Maximum-0.04595371 - 0.082509495
Average (Standard dev.)0.00041103782 (±0.004655969)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions200200200
Spacing200200200
CellA=B=C: 211.8 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.0591.0591.059
M x/y/z200200200
origin x/y/z0.0000.0000.000
length x/y/z211.800211.800211.800
α/β/γ90.00090.00090.000
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS200200200
D min/max/mean-0.0460.0830.000

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Supplemental data

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Sample components

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Entire : Apo state post-translational Sec translocon

EntireName: Apo state post-translational Sec translocon
Components
  • Complex: Apo state post-translational Sec translocon

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Supramolecule #1: Apo state post-translational Sec translocon

SupramoleculeName: Apo state post-translational Sec translocon / type: complex / ID: 1 / Parent: 0
Source (natural)Organism: Saccharomyces cerevisiae (brewer's yeast)
Recombinant expressionOrganism: Saccharomyces cerevisiae (brewer's yeast)
Molecular weightTheoretical: 223 KDa

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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

Concentration5 mg/mL
BufferpH: 7.4
Component:
ConcentrationFormulaName
20.0 mMC8H18N2O4SHEPES
100.0 mMCH3CO2KKOAc
2.5 mMMg(CH3COO)2Mg(OAc)2
1.0 mMC4H10O2S2DTT
0.02 %C56H92O25GDN
GridModel: UltrAuFoil R2/2 / Material: GOLD
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recording#0 - Image recording ID: 1 / #0 - Film or detector model: GATAN K2 QUANTUM (4k x 4k) / #0 - Detector mode: COUNTING / #0 - Number grids imaged: 1 / #0 - Average electron dose: 36.0 e/Å2 / #1 - Image recording ID: 2 / #1 - Film or detector model: GATAN K2 QUANTUM (4k x 4k) / #1 - Detector mode: COUNTING / #1 - Number grids imaged: 1 / #1 - Average electron dose: 48.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing #1

Image processing ID1
Image recording ID1
CTF correctionSoftware - Name: CTFFIND (ver. 4)
Startup modelType of model: EMDB MAP
EMDB ID:

0440

Final reconstructionAlgorithm: FOURIER SPACE / Resolution.type: BY AUTHOR / Resolution: 4.3 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 3.1) / Number images used: 57945
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 3.0)
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 3.1)
FSC plot (resolution estimation)

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Image processing #2

Image processing ID2
Image recording ID2
CTF correctionSoftware - Name: CTFFIND (ver. 4)
Startup modelType of model: EMDB MAP
EMDB ID:

0440

Final reconstructionAlgorithm: FOURIER SPACE / Resolution.type: BY AUTHOR / Resolution: 4.3 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 3.1) / Number images used: 11696
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 3.1)
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 3.1)
Final 3D classificationSoftware - Name: RELION (ver. 3.1)
FSC plot (resolution estimation)

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