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- EMDB-0440: CryoEM structure of the post-translational protein translocation ... -
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Open data
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Basic information
Entry | Database: EMDB / ID: EMD-0440 | |||||||||
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Title | CryoEM structure of the post-translational protein translocation machinery of the ER membrane | |||||||||
![]() | EM map after focused refinement | |||||||||
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![]() | Sec61 / post-translational translocation / yeast / Sec63 / PROTEIN TRANSPORT / TRANSPORT PROTEIN | |||||||||
Function / homology | ![]() misfolded protein transport / Sec62/Sec63 complex / translocon complex / 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 ...misfolded protein transport / Sec62/Sec63 complex / translocon complex / 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 / SRP-dependent cotranslational protein targeting to membrane, translocation / signal sequence binding / post-translational protein targeting to membrane, translocation / peptide transmembrane transporter activity / 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 / cytosol Similarity search - Function | |||||||||
Biological species | ![]() ![]() | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 4.1 Å | |||||||||
![]() | Wu X / Cabanos C | |||||||||
Funding support | ![]()
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![]() | ![]() Title: Structure of the post-translational protein translocation machinery of the ER membrane. Authors: Xudong Wu / Cerrone Cabanos / Tom A Rapoport / ![]() Abstract: Many proteins must translocate through the protein-conducting Sec61 channel in the eukaryotic endoplasmic reticulum membrane or the SecY channel in the prokaryotic plasma membrane. Proteins with ...Many proteins must translocate through the protein-conducting Sec61 channel in the eukaryotic endoplasmic reticulum membrane or the SecY channel in the prokaryotic plasma membrane. Proteins with highly hydrophobic signal sequences are first recognized by the signal recognition particle (SRP) and then moved co-translationally through the Sec61 or SecY channel by the associated translating ribosome. Substrates with less hydrophobic signal sequences bypass the SRP and are moved through the channel post-translationally. In eukaryotic cells, post-translational translocation is mediated by the association of the Sec61 channel with another membrane protein complex, the Sec62-Sec63 complex, and substrates are moved through the channel by the luminal BiP ATPase. How the Sec62-Sec63 complex activates the Sec61 channel for post-translational translocation is not known. Here we report the electron cryo-microscopy structure of the Sec complex from Saccharomyces cerevisiae, consisting of the Sec61 channel and the Sec62, Sec63, Sec71 and Sec72 proteins. Sec63 causes wide opening of the lateral gate of the Sec61 channel, priming it for the passage of low-hydrophobicity signal sequences into the lipid phase, without displacing the channel's plug domain. Lateral channel opening is triggered by Sec63 interacting both with cytosolic loops in the C-terminal half of Sec61 and transmembrane segments in the N-terminal half of the Sec61 channel. The cytosolic Brl domain of Sec63 blocks ribosome binding to the channel and recruits Sec71 and Sec72, positioning them for the capture of polypeptides associated with cytosolic Hsp70. Our structure shows how the Sec61 channel is activated for post-translational protein translocation. | |||||||||
History |
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Structure visualization
Movie |
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Structure viewer | EM map: ![]() ![]() ![]() |
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 14.4 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 19.9 KB 19.9 KB | Display Display | ![]() |
Images | ![]() | 64.4 KB | ||
Filedesc metadata | ![]() | 6.9 KB | ||
Others | ![]() | 13.9 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 6nd1MC M: atomic model generated by this map C: citing same article ( |
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Similar structure data |
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Links
EMDB pages | ![]() ![]() |
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Related items in Molecule of the Month |
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Map
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Annotation | EM map after focused refinement | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 1.35 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
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-Supplemental data
-Additional map: EM map before focused refinement, without sharpening
File | emd_0440_additional.map | ||||||||||||
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Annotation | EM map before focused refinement, without sharpening | ||||||||||||
Projections & Slices |
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Density Histograms |
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Sample components
-Entire : The yeast Sec Complex involved in post-translational protein tran...
Entire | Name: The yeast Sec Complex involved in post-translational protein translocation |
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Components |
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-Supramolecule #1: The yeast Sec Complex involved in post-translational protein tran...
Supramolecule | Name: The yeast Sec Complex involved in post-translational protein translocation type: complex / ID: 1 / Parent: 0 / Macromolecule list: all |
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Source (natural) | Organism: ![]() ![]() |
-Macromolecule #1: Protein transport protein SEC61
Macromolecule | Name: Protein transport protein SEC61 / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() ![]() |
Molecular weight | Theoretical: 52.978148 KDa |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: 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 |
-Macromolecule #2: Protein translocation protein SEC63
Macromolecule | Name: Protein translocation protein SEC63 / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() ![]() |
Molecular weight | Theoretical: 76.831602 KDa |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: 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 EGSGGSGDYK DDDDK UniProtKB: Protein translocation protein SEC63 |
-Macromolecule #3: Protein transport protein SSS1
Macromolecule | Name: Protein transport protein SSS1 / type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() ![]() |
Molecular weight | Theoretical: 8.958641 KDa |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: MARASEKGEE KKQSNNQVEK LVEAPVEFVR EGTQFLAKCK KPDLKEYTKI VKAVGIGFIA VGIIGYAIKL IHIPIRYVIV UniProtKB: Protein transport protein SSS1 |
-Macromolecule #4: Protein transport protein SBH1
Macromolecule | Name: Protein transport protein SBH1 / type: protein_or_peptide / ID: 4 / Number of copies: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() ![]() |
Molecular weight | Theoretical: 8.723155 KDa |
Sequence | String: MSSPTPPGGQ RTLQKRKQGS SQKVAASAPK KNTNSNNSIL KIYSDEATGL RVDPLVVLFL AVGFIFSVVA LHVISKVAGK LF UniProtKB: Protein transport protein SBH1 |
-Macromolecule #5: Translocation protein SEC66
Macromolecule | Name: Translocation protein SEC66 / type: protein_or_peptide / ID: 5 / Number of copies: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() ![]() |
Molecular weight | Theoretical: 24.263939 KDa |
Sequence | String: 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 |
-Macromolecule #6: Translocation protein SEC72
Macromolecule | Name: Translocation protein SEC72 / type: protein_or_peptide / ID: 6 / Number of copies: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() ![]() |
Molecular weight | Theoretical: 21.63109 KDa |
Sequence | String: 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 |
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Concentration | 6 mg/mL | ||||||||||||
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Buffer | pH: 7.4 Component:
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Grid | Model: Quantifoil R1.2/1.3 / Material: COPPER / Mesh: 400 / Support film - Material: CARBON / Support film - topology: CONTINUOUS / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 60 sec. / Pretreatment - Atmosphere: AIR | ||||||||||||
Vitrification | Cryogen name: ETHANE / Chamber humidity: 90 % / Chamber temperature: 298 K / Instrument: GATAN CRYOPLUNGE 3 / Details: blot for 2.5 seconds before plunging. | ||||||||||||
Details | This sample was monodisperse |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Image recording | Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: SUPER-RESOLUTION / Average electron dose: 54.8 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: OTHER / Imaging mode: OTHER |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Image processing
Startup model | Type of model: OTHER |
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Final reconstruction | Applied symmetry - Point group: C1 (asymmetric) / Resolution.type: BY AUTHOR / Resolution: 4.1 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 91218 |
Initial angle assignment | Type: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 3.0) |
Final angle assignment | Type: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 3.0) |
-Atomic model buiding 1
Refinement | Protocol: AB INITIO MODEL |
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Output model | ![]() PDB-6nd1: |