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- EMDB-22786: Cryo-EM structure of the Sec complex from T. lanuginosus, wild-ty... -
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Open data
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Basic information
Entry | Database: EMDB / ID: EMD-22786 | |||||||||
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Title | Cryo-EM structure of the Sec complex from T. lanuginosus, wild-type, consensus map of classes with Sec62 | |||||||||
![]() | Unsharpened, lowpass-filtered map | |||||||||
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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: 3.75 Å | |||||||||
![]() | Itskanov S / Park E | |||||||||
Funding support | ![]()
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![]() | ![]() Title: Stepwise gating of the Sec61 protein-conducting channel by Sec63 and Sec62. Authors: Samuel Itskanov / Katie M Kuo / James C Gumbart / Eunyong Park / ![]() Abstract: Many proteins are transported into the endoplasmic reticulum by the universally conserved Sec61 channel. Post-translational transport requires two additional proteins, Sec62 and Sec63, but their ...Many proteins are transported into the endoplasmic reticulum by the universally conserved Sec61 channel. Post-translational transport requires two additional proteins, Sec62 and Sec63, but their functions are poorly defined. In the present study, we determined cryo-electron microscopy (cryo-EM) structures of several variants of Sec61-Sec62-Sec63 complexes from Saccharomyces cerevisiae and Thermomyces lanuginosus and show that Sec62 and Sec63 induce opening of the Sec61 channel. Without Sec62, the translocation pore of Sec61 remains closed by the plug domain, rendering the channel inactive. We further show that the lateral gate of Sec61 must first be partially opened by interactions between Sec61 and Sec63 in cytosolic and luminal domains, a simultaneous disruption of which completely closes the channel. The structures and molecular dynamics simulations suggest that Sec62 may also prevent lipids from invading the channel through the open lateral gate. Our study shows how Sec63 and Sec62 work together in a hierarchical manner to activate Sec61 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 | ![]() | 32.1 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 24.8 KB 24.8 KB | Display Display | ![]() |
FSC (resolution estimation) | ![]() | 9.3 KB | Display | ![]() |
Images | ![]() | 28.7 KB | ||
Masks | ![]() | 64 MB | ![]() | |
Others | ![]() ![]() ![]() | 59.6 MB 59.5 MB 59.5 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 7kahC ![]() 7kaiC ![]() 7kajC ![]() 7kakC ![]() 7kalC ![]() 7kamC ![]() 7kanC ![]() 7kaoC ![]() 7kapC ![]() 7kaqC ![]() 7karC ![]() 7kasC ![]() 7katC ![]() 7kauC ![]() 7kb5C 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 | Unsharpened, lowpass-filtered map | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 1.14 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
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-Supplemental data
-Mask #1
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-Additional map: Sharpened map
File | emd_22786_additional_1.map | ||||||||||||
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Annotation | Sharpened map | ||||||||||||
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-Half map: half-volume 1
File | emd_22786_half_map_1.map | ||||||||||||
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Annotation | half-volume 1 | ||||||||||||
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-Half map: half-volume 2
File | emd_22786_half_map_2.map | ||||||||||||
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Annotation | half-volume 2 | ||||||||||||
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Sample components
-Entire : Endoplasmic reticulum protein-transport machinery Sec complex fro...
Entire | Name: Endoplasmic reticulum protein-transport machinery Sec complex from T. lanuginosus |
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Components |
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-Supramolecule #1: Endoplasmic reticulum protein-transport machinery Sec complex fro...
Supramolecule | Name: Endoplasmic reticulum protein-transport machinery Sec complex from T. lanuginosus type: complex / ID: 1 / Parent: 0 / Macromolecule list: all |
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Source (natural) | Organism: ![]() ![]() |
Recombinant expression | Organism: ![]() ![]() |
-Macromolecule #1: Protein transport channel Sec61 complex, alpha subunit (Sec61)
Macromolecule | Name: Protein transport channel Sec61 complex, alpha subunit (Sec61) type: protein_or_peptide / ID: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() ![]() |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: MSGLRFLDLI KPFTPLLPEV AAPETKVPFN QKLMWTGLTL LIFLVMSQMP LYGIVSSDTS DPLYWLRMM LASNRGTLME LGITPIISSG MVFQLLAGTH LIDVNLDLKT DRELYQTAQK L FAIILSFG QACVHVLTGL YGQPSDLGAG ICVLLIVQLV VAGLVVILLD ...String: MSGLRFLDLI KPFTPLLPEV AAPETKVPFN QKLMWTGLTL LIFLVMSQMP LYGIVSSDTS DPLYWLRMM LASNRGTLME LGITPIISSG MVFQLLAGTH LIDVNLDLKT DRELYQTAQK L FAIILSFG QACVHVLTGL YGQPSDLGAG ICVLLIVQLV VAGLVVILLD ELLQKGYGLG SG ISLFIAT NICESIVWKA FSPTTINTGR GPEFEGAIIA LFHLLLTWPD KQRALREAFY RQS LPNIMN LLATLLVFAA VIYLQGFRVE IPVKSARQRG VRGSYPVRLF YTSNMPIMLQ SALC SNVFL ISQMLYSRFS DNLLVRLLGV WEPREGSAQL HAASGIAYYM SPPLNFKEAL LDPVH TVVY ITFMLVACAL FSKTWIEVSG SSPRDVAKQL KDQGLVMAGH REQSMYKELK RVIPTA AAF GGACIGALSV ASDLLGALGS GTGILLAVTI IYGYFEMAAR EGDFGQGLRG LVPGNGS |
-Macromolecule #2: Protein transport channel Sec61 complex, beta subunit (Sbh1)
Macromolecule | Name: Protein transport channel Sec61 complex, beta subunit (Sbh1) type: protein_or_peptide / ID: 2 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() ![]() |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: MASSGAESGS ESKSPNPGAG SGPGSASGSS AGVIRPSSPT PPGGPRAAIR RRAAADHKES LRNARPSST RAAGAGGSSG TMLKLYTDES PGLRVDPVVV LVLSLCFIFS VVGLHVIAKI T RKFSS |
-Macromolecule #3: Protein transport channel Sec61 complex, gamma subunit (Sss1)
Macromolecule | Name: Protein transport channel Sec61 complex, gamma subunit (Sss1) type: protein_or_peptide / ID: 3 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() ![]() |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: MSEQVQELLD IPRDFLKDGM QFIHKCQKPD RKEFKKVCQA VAIGFVAMGA IGYIVKLVHI PINNILVAG S |
-Macromolecule #4: Protein transport protein Sec63
Macromolecule | Name: Protein transport protein Sec63 / type: protein_or_peptide / ID: 4 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() ![]() |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: GGSGGSGGSG GSGGSMSSRE YNYDENGQFF PFFVLTLTGL VTLPLTYSLL KPPKK VEST APRIKSDFKP QHDDIIQNQK RKRLRKERRV KRAIAVVVGW AIIGYMVYLI IVTRRT APK IWDPYEILGI SRSADERAIA RRYKRLSLLY HPDKVRPDPS KNETMEMLNQ ...String: GGSGGSGGSG GSGGSMSSRE YNYDENGQFF PFFVLTLTGL VTLPLTYSLL KPPKK VEST APRIKSDFKP QHDDIIQNQK RKRLRKERRV KRAIAVVVGW AIIGYMVYLI IVTRRT APK IWDPYEILGI SRSADERAIA RRYKRLSLLY HPDKVRPDPS KNETMEMLNQ RFVELTK AY KALTDEEIRN NYLQYGHPDG KQSYSIGIAL PKLIIEEGSG KYVLMLYASL LGILLPYI V GRWWYGSQRY TREKVLAASA GNMFREYEGT MIGGPIVNAL STGEEYKEML SGPKAEEGL AKVEKKVLAL DEKILSAKDR EVLRKIDNPV RRKALALLWA YLNRIDLEDP VLNEEKYEAG SIALSLTES FTAIALAFGN LIPIIGAYRI SQCIVQAISP GSSPLLQLPY FTPKVVESVE G ADVKTHLS VQKYLDMPEE RRRSLTVGPG LLTEDQYNSA IAVAKQLPLF AISKAFFKVA GE RVVTPSS LVQLVIKGRI IPPGSTGVPD VTEKDLEDID PDEADVNAII GRKGATKPSG KSG DENDGD RVQPPLAHAP YLPRDHPPRW HIFLADAKQG KIAVPPFTFT TFDKPIFDEQ GKPT FNMQT LRMQFQAPPQ VGNFSFVLHM ISDSYMGFDV KQEITLQVED PSKAAVLQEE DDISE PDED SIAGQMQALK TGVPPKKKKV VESDDDESDT EGDEEDTSET DTETDTDEEG SGTGEN LYF Q |
-Macromolecule #5: Protein transport protein Sec66/Sec71
Macromolecule | Name: Protein transport protein Sec66/Sec71 / type: protein_or_peptide / ID: 5 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() ![]() |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: MDWLTLVVPF AYLGVLIGCL ATFSSLYRRR KAAKAASLEP WFPPHLQRDI YHSLLHLDQQ QQNEKKTRV PETVLKAALL RRAAEDIKRV MAIREQKQAL ALLLQRGSVG DELWQRFLRA E KEMEDEVR DVVAEANSYA PNWGQVIFQS AREMDANATY RARMEEYQAT ...String: MDWLTLVVPF AYLGVLIGCL ATFSSLYRRR KAAKAASLEP WFPPHLQRDI YHSLLHLDQQ QQNEKKTRV PETVLKAALL RRAAEDIKRV MAIREQKQAL ALLLQRGSVG DELWQRFLRA E KEMEDEVR DVVAEANSYA PNWGQVIFQS AREMDANATY RARMEEYQAT VAEERAWWDK KR ASIQEGF MKELDAEKER PATAASTATN TTSTTSDDDA VLVEAEKEGT SSPAPGKKKK KGK KGS |
-Macromolecule #6: Protein transport protein Sec72
Macromolecule | Name: Protein transport protein Sec72 / type: protein_or_peptide / ID: 6 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() ![]() |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: MSSDLDTYTH YPLHLDPSSK AVSLATTEGQ TPAQTEAVEA ELQQLNALHR SLISLDPPNV PPPPLPINP KRSAQITKLK ETANTAYKRG NHGEAVRLYS YAIEMAAGRP GWEPVNLARE E LSGLYANR AQAHMAQQMW PEGWVDAKCS VESKPVGNAK GWWRGGKCLV ...String: MSSDLDTYTH YPLHLDPSSK AVSLATTEGQ TPAQTEAVEA ELQQLNALHR SLISLDPPNV PPPPLPINP KRSAQITKLK ETANTAYKRG NHGEAVRLYS YAIEMAAGRP GWEPVNLARE E LSGLYANR AQAHMAQQMW PEGWVDAKCS VESKPVGNAK GWWRGGKCLV EMGRYDEARA WI EQALGIE GPASDGGKEL AALLEEIKAG SQRRQGS |
-Macromolecule #7: Protein transport protein Sec62
Macromolecule | Name: Protein transport protein Sec62 / type: protein_or_peptide / ID: 7 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() ![]() |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: MAAPPPGMTP QQFAALQQHM QQQIAAEAAK RGMTVEEFSK MQREQLNAEA AKAGMTPEQY INQLRMRAL QQRAAMQQQM QQQQQQGGQG QTQGQGQGQG QQGQGQPQVQ HVQHVQQQVS V NPNAPPNP KAIALAKWLR SQNLKARTCI LDGQRREMFK VKRALRALES ...String: MAAPPPGMTP QQFAALQQHM QQQIAAEAAK RGMTVEEFSK MQREQLNAEA AKAGMTPEQY INQLRMRAL QQRAAMQQQM QQQQQQGGQG QTQGQGQGQG QQGQGQPQVQ HVQHVQQQVS V NPNAPPNP KAIALAKWLR SQNLKARTCI LDGQRREMFK VKRALRALES PEYQKAAAKN KL LPPVTDR ASAENAFKLL PLSFLALRVS KVSSNYNKGK RVKGLWTVKV EQHQDTDPMT HYV WLYEGP QWKQKALAAA FVIGIFAIVL FPLWPIMLRQ GVWYLSVGML GLLGLFFALA IVRL ILFCV TVFVVPPGIW LFPNLFEDVG FIDSFKPLWA WNEKKKKPKK AKAAVSKSQE KGAAP TTAA PEAPTATTTS SEAQPSSSSG TASKRNLAAS VEDAEEGS |
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Concentration | 5 mg/mL |
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Buffer | pH: 7.5 |
Grid | Model: Quantifoil R1.2/1.3 / Material: GOLD / Mesh: 400 / Support film - Material: CARBON / Support film - topology: HOLEY / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Atmosphere: AIR / Pretreatment - Pressure: 0.039 kPa |
Vitrification | Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV |
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Electron microscopy
Microscope | FEI TALOS ARCTICA |
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Image recording | Film or detector model: GATAN K3 (6k x 4k) / Average electron dose: 50.0 e/Å2 |
Electron beam | Acceleration voltage: 200 kV / Electron source: ![]() |
Electron optics | Calibrated magnification: 43860 / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD |
Sample stage | Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN |
Experimental equipment | ![]() Model: Talos Arctica / Image courtesy: FEI Company |