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- EMDB-0336: Cryo-EM structure of the yeast Sec complex -

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Basic information

Entry
Database: EMDB / ID: EMD-0336
TitleCryo-EM structure of the yeast Sec complex
Map dataSharpened full map
Sample
  • Complex: Posttranslational Sec protein-translocation channel complex
    • Protein or peptide: Protein transport protein SEC61Protein targeting
    • Protein or peptide: Protein transport protein SSS1Protein targeting
    • Protein or peptide: Protein transport protein SBH1Protein targeting
    • Protein or peptide: Protein translocation protein SEC63Protein targeting
    • Protein or peptide: Translocation protein SEC66
    • Protein or peptide: Translocation protein SEC72
KeywordsSec61 / Sec63 / Sec71 / Sec72 / Sec66 / protein translocation / translocon / endoplasmic reticulum / secretion / TRANSPORT PROTEIN
Function / homology
Function and homology information


protein transmembrane import into intracellular organelle / misfolded protein transport / Sec62/Sec63 complex / translocon complex / cytosol to endoplasmic reticulum transport / Insertion of tail-anchored proteins into the endoplasmic reticulum membrane / rough endoplasmic reticulum membrane / Ssh1 translocon complex / Sec61 translocon complex / protein-transporting ATPase activity ...protein transmembrane import into intracellular organelle / misfolded protein transport / Sec62/Sec63 complex / translocon complex / cytosol to endoplasmic reticulum transport / Insertion of tail-anchored proteins into the endoplasmic reticulum membrane / 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 / peptide transmembrane transporter activity / signal sequence binding / SRP-dependent cotranslational protein targeting to membrane / post-translational protein targeting to membrane, translocation / nuclear inner membrane / retrograde protein transport, ER to cytosol / protein transmembrane transporter activity / : / guanyl-nucleotide exchange factor activity / cell periphery / ribosome binding / structural molecule activity / endoplasmic reticulum membrane / endoplasmic reticulum / mitochondrion / membrane / cytosol
Similarity search - Function
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. ...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 / Sec63 domain / Sec63 Brl domain / DnaJ 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
Protein translocation protein SEC63 / Protein transport protein SEC61 / Translocation protein SEC66 / Protein transport protein SSS1 / Translocation protein SEC72 / Protein transport protein SBH1
Similarity search - Component
Biological speciesSaccharomyces cerevisiae S288c (yeast) / Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (yeast)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.68 Å
AuthorsPark E / Itskanov S
CitationJournal: Science / Year: 2019
Title: Structure of the posttranslational Sec protein-translocation channel complex from yeast.
Authors: Samuel Itskanov / Eunyong Park /
Abstract: The Sec61 protein-conducting channel mediates transport of many proteins, such as secretory proteins, across the endoplasmic reticulum (ER) membrane during or after translation. Posttranslational ...The Sec61 protein-conducting channel mediates transport of many proteins, such as secretory proteins, across the endoplasmic reticulum (ER) membrane during or after translation. Posttranslational transport is enabled by two additional membrane proteins associated with the channel, Sec63 and Sec62, but its mechanism is poorly understood. We determined a structure of the Sec complex (Sec61-Sec63-Sec71-Sec72) from by cryo-electron microscopy (cryo-EM). The structure shows that Sec63 tightly associates with Sec61 through interactions in cytosolic, transmembrane, and ER-luminal domains, prying open Sec61's lateral gate and translocation pore and thus activating the channel for substrate engagement. Furthermore, Sec63 optimally positions binding sites for cytosolic and luminal chaperones in the complex to enable efficient polypeptide translocation. Our study provides mechanistic insights into eukaryotic posttranslational protein translocation.
History
DepositionNov 16, 2018-
Header (metadata) releaseDec 12, 2018-
Map releaseDec 19, 2018-
UpdateMar 20, 2024-
Current statusMar 20, 2024Processing site: RCSB / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.42
  • Imaged by UCSF Chimera
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  • Surface view colored by height
  • Surface level: 0.42
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-6n3q
  • Surface level: 0.42
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_0336.png

Downloads & links

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Map

FileDownload / File: emd_0336.map.gz / Format: CCP4 / Size: 64 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationSharpened full map
Voxel sizeX=Y=Z: 1.16 Å
Density
Contour LevelBy AUTHOR: 0.42 / Movie #1: 0.42
Minimum - Maximum-1.1991107 - 3.022722
Average (Standard dev.)0.009868922 (±0.06600453)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions256256256
Spacing256256256
CellA=B=C: 296.96 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.161.161.16
M x/y/z256256256
origin x/y/z0.0000.0000.000
length x/y/z296.960296.960296.960
α/β/γ90.00090.00090.000
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS256256256
D min/max/mean-1.1993.0230.010

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Supplemental data

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Additional map: Unfiltered full map

Fileemd_0336_additional.map
AnnotationUnfiltered full map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : Posttranslational Sec protein-translocation channel complex

EntireName: Posttranslational Sec protein-translocation channel complex
Components
  • Complex: Posttranslational Sec protein-translocation channel complex
    • Protein or peptide: Protein transport protein SEC61Protein targeting
    • Protein or peptide: Protein transport protein SSS1Protein targeting
    • Protein or peptide: Protein transport protein SBH1Protein targeting
    • Protein or peptide: Protein translocation protein SEC63Protein targeting
    • Protein or peptide: Translocation protein SEC66
    • Protein or peptide: Translocation protein SEC72

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Supramolecule #1: Posttranslational Sec protein-translocation channel complex

SupramoleculeName: Posttranslational Sec protein-translocation channel complex
type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Saccharomyces cerevisiae S288c (yeast)

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Macromolecule #1: Protein transport protein SEC61

MacromoleculeName: Protein transport protein SEC61 / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (yeast)
Strain: ATCC 204508 / S288c
Molecular weightTheoretical: 52.978148 KDa
SequenceString: MSSNRVLDLF KPFESFLPEV IAPERKVPYN QKLIWTGVSL LIFLILGQIP LYGIVSSETS DPLYWLRAML ASNRGTLLEL GVSPIITSS MIFQFLQGTQ LLQIRPESKQ DRELFQIAQK VCAIILILGQ ALVVVMTGNY GAPSDLGLPI CLLLIFQLMF A SLIVMLLD ...String:
MSSNRVLDLF KPFESFLPEV IAPERKVPYN QKLIWTGVSL LIFLILGQIP LYGIVSSETS DPLYWLRAML ASNRGTLLEL GVSPIITSS MIFQFLQGTQ LLQIRPESKQ DRELFQIAQK VCAIILILGQ ALVVVMTGNY GAPSDLGLPI CLLLIFQLMF A SLIVMLLD ELLSKGYGLG SGISLFTATN IAEQIFWRAF APTTVNSGRG KEFEGAVIAF FHLLAVRKDK KRALVEAFYR TN LPNMFQV LMTVAIFLFV LYLQGFRYEL PIRSTKVRGQ IGIYPIKLFY TSNTPIMLQS ALTSNIFLIS QILFQKYPTN PLI RLIGVW GIRPGTQGPQ MALSGLAYYI QPLMSLSEAL LDPIKTIVYI TFVLGSCAVF SKTWIEISGT SPRDIAKQFK DQGM VINGK RETSIYRELK KIIPTAAAFG GATIGALSVG SDLLGTLGSG ASILMATTTI YGYYEAAAKE GGFTKNLVPG FSDLM

UniProtKB: Protein transport protein SEC61

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Macromolecule #2: Protein transport protein SSS1

MacromoleculeName: Protein transport protein SSS1 / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (yeast)
Strain: ATCC 204508 / S288c
Molecular weightTheoretical: 8.958641 KDa
SequenceString:
MARASEKGEE KKQSNNQVEK LVEAPVEFVR EGTQFLAKCK KPDLKEYTKI VKAVGIGFIA VGIIGYAIKL IHIPIRYVIV

UniProtKB: Protein transport protein SSS1

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Macromolecule #3: Protein transport protein SBH1

MacromoleculeName: Protein transport protein SBH1 / type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (yeast)
Strain: ATCC 204508 / S288c
Molecular weightTheoretical: 8.723155 KDa
SequenceString:
MSSPTPPGGQ RTLQKRKQGS SQKVAASAPK KNTNSNNSIL KIYSDEATGL RVDPLVVLFL AVGFIFSVVA LHVISKVAGK LF

UniProtKB: Protein transport protein SBH1

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Macromolecule #4: Protein translocation protein SEC63

MacromoleculeName: Protein translocation protein SEC63 / type: protein_or_peptide / ID: 4 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (yeast)
Strain: ATCC 204508 / S288c
Molecular weightTheoretical: 75.432258 KDa
SequenceString: MPTNYEYDEA SETWPSFILT GLLMVVGPMT LLQIYQIFFG ANAEDGNSGK SKEFNEEVFK NLNEEYTSDE IKQFRRKFDK NSNKKSKIW SRRNIIIIVG WILVAILLQR INSNDAIKDA ATKLFDPYEI LGISTSASDR DIKSAYRKLS VKFHPDKLAK G LTPDEKSV ...String:
MPTNYEYDEA SETWPSFILT GLLMVVGPMT LLQIYQIFFG ANAEDGNSGK SKEFNEEVFK NLNEEYTSDE IKQFRRKFDK NSNKKSKIW SRRNIIIIVG WILVAILLQR INSNDAIKDA ATKLFDPYEI LGISTSASDR DIKSAYRKLS VKFHPDKLAK G LTPDEKSV MEETYVQITK AYESLTDELV RQNYLKYGHP DGPQSTSHGI ALPRFLVDGS ASPLLVVCYV ALLGLILPYF VS RWWARTQ SYTKKGIHNV TASNFVSNLV NYKPSEIVTT DLILHWLSFA HEFKQFFPDL QPTDFEKLLQ DHINRRDSGK LNN AKFRIV AKCHSLLHGL LDIACGFRNL DIALGAINTF KCIVQAVPLT PNCQILQLPN VDKEHFITKT GDIHTLGKLF TLED AKIGE VLGIKDQAKL NETLRVASHI PNLKIIKADF LVPGENQVTP SSTPYISLKV LVRSAKQPLI PTSLIPEENL TEPQD FESQ RDPFAMMSKQ PLVPYSFAPF FPTKRRGSWC CLVSSQKDGK ILQTPIIIEK LSYKNLNDDK DFFDKRIKMD LTKHEK FDI NDWEIGTIKI PLGQPAPETV GDFFFRVIVK STDYFTTDLD ITMNMKVRDS PAVEQVEVYS EEDDEYSTDD DETESDD ES DASDYTDIDT DTEAEDDESP E

UniProtKB: Protein translocation protein SEC63

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Macromolecule #5: Translocation protein SEC66

MacromoleculeName: Translocation protein SEC66 / type: protein_or_peptide / ID: 5 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (yeast)
Strain: ATCC 204508 / S288c
Molecular weightTheoretical: 24.263939 KDa
SequenceString: MSEFNETKFS NNGTFFETEE PIVETKSISV YTPLIYVFIL VVSLVMFASS YRKKQAKKIS EQPSIFDEND AHDLYFQIKE MSENEKIHE KVLKAALLNR GAESVRRSLK LKELAPQINL LYKNGSIGED YWKRFETEVK LIELEFKDTL QEAERLQPGW V QLFVMVCK ...String:
MSEFNETKFS NNGTFFETEE PIVETKSISV YTPLIYVFIL VVSLVMFASS YRKKQAKKIS EQPSIFDEND AHDLYFQIKE MSENEKIHE KVLKAALLNR GAESVRRSLK LKELAPQINL LYKNGSIGED YWKRFETEVK LIELEFKDTL QEAERLQPGW V QLFVMVCK EICFNQALSR RYQSILKRKE VCIKEWELKI NNDGRLVN

UniProtKB: Translocation protein SEC66

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Macromolecule #6: Translocation protein SEC72

MacromoleculeName: Translocation protein SEC72 / type: protein_or_peptide / ID: 6 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (yeast)
Strain: ATCC 204508 / S288c
Molecular weightTheoretical: 21.63109 KDa
SequenceString: MVTLEYNANS KLITASDAVV ALSTETNIDQ INVLTTSLIG ETNPNFTPQP NEALSKMIKG LFESGMKNLQ QKKLNEALKN VSLAIEMAQ RKRAPWEAFA IQLPELHFML RSKIDLCLIL GKHLEALQDL DFLLGTGLIQ PDVFVRKADC LLKLRQWEEA R ATCERGLA ...String:
MVTLEYNANS KLITASDAVV ALSTETNIDQ INVLTTSLIG ETNPNFTPQP NEALSKMIKG LFESGMKNLQ QKKLNEALKN VSLAIEMAQ RKRAPWEAFA IQLPELHFML RSKIDLCLIL GKHLEALQDL DFLLGTGLIQ PDVFVRKADC LLKLRQWEEA R ATCERGLA LAPEDMKLRA LLIETARNLA EYNGE

UniProtKB: Translocation protein SEC72

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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: 7.5
GridModel: Quantifoil R1.2/1.3 / Material: GOLD / Mesh: 400 / Support film - Material: CARBON / Support film - topology: HOLEY / Pretreatment - Type: PLASMA CLEANING / Pretreatment - Time: 20 sec. / Pretreatment - Atmosphere: OTHER
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeFEI TALOS ARCTICA
Electron beamAcceleration voltage: 200 kV / Electron source: FIELD EMISSION GUN
Electron opticsC2 aperture diameter: 50.0 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELDBright-field microscopy / Cs: 2.7 mm / Nominal defocus max: 2.4 µm / Nominal defocus min: 0.8 µm / Nominal magnification: 43103
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: SUPER-RESOLUTION / Average exposure time: 8.0 sec. / Average electron dose: 50.0 e/Å2
Experimental equipment
Model: Talos Arctica / Image courtesy: FEI Company

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Image processing

Particle selectionNumber selected: 358961
Startup modelType of model: OTHER / Details: Ab initio reconstruction by cryoSPARC
Initial angle assignmentType: RANDOM ASSIGNMENT / Software - Name: cryoSPARC (ver. 2.0.27)
Final 3D classificationNumber classes: 3 / Software - Name: cryoSPARC (ver. 2.0.27)
Final angle assignmentType: OTHER / Software - Name: cryoSPARC (ver. 2.0.27)
Final reconstructionApplied symmetry - Point group: C1 (asymmetric) / Algorithm: FOURIER SPACE / Resolution.type: BY AUTHOR / Resolution: 3.68 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC (ver. 2.0.27) / Number images used: 172531
FSC plot (resolution estimation)

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Atomic model buiding 1

Initial modelPDB ID:

5l0w


Chain - Source name: PDB / Chain - Initial model type: experimental model
Output model

PDB-6n3q:
Cryo-EM structure of the yeast Sec complex

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