Insertion of tail-anchored proteins into the endoplasmic reticulum membrane / membrane docking / pronephric nephron development / cotranslational protein targeting to membrane / Ssh1 translocon complex / Sec61 translocon complex / protein targeting to ER / protein insertion into ER membrane / SRP-dependent cotranslational protein targeting to membrane, translocation / signal sequence binding ...Insertion of tail-anchored proteins into the endoplasmic reticulum membrane / membrane docking / pronephric nephron development / cotranslational protein targeting to membrane / Ssh1 translocon complex / Sec61 translocon complex / protein targeting to ER / protein insertion into ER membrane / SRP-dependent cotranslational protein targeting to membrane, translocation / signal sequence binding / post-translational protein targeting to membrane, translocation / protein transmembrane transporter activity / phospholipid binding / ribosome binding / endoplasmic reticulum membrane Similarity search - Function
Protein translocase SEC61 complex, gamma subunit / Protein translocase SecE domain superfamily / Translocon Sec61/SecY, plug domain / Plug domain of Sec61p / 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 ...Protein translocase SEC61 complex, gamma subunit / Protein translocase SecE domain superfamily / Translocon Sec61/SecY, plug domain / Plug domain of Sec61p / 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 Similarity search - Domain/homology
Protein transport protein Sec61 subunit alpha isoform 1 / Protein transport protein Sec61 subunit gamma Similarity search - Component
Biological species
Canis lupus familiaris (dog)
Method
single particle reconstruction / cryo EM / Resolution: 2.69 Å
Journal: Mol Cell / Year: 2020 Title: Structure of the Inhibited State of the Sec Translocon. Authors: Samuel F Gérard / Belinda S Hall / Afroditi M Zaki / Katherine A Corfield / Peter U Mayerhofer / Catia Costa / Daniel K Whelligan / Philip C Biggin / Rachel E Simmonds / Matthew K Higgins / Abstract: Protein secretion in eukaryotes and prokaryotes involves a universally conserved protein translocation channel formed by the Sec61 complex. Unrelated small-molecule natural products and synthetic ...Protein secretion in eukaryotes and prokaryotes involves a universally conserved protein translocation channel formed by the Sec61 complex. Unrelated small-molecule natural products and synthetic compounds inhibit Sec61 with differential effects for different substrates or for Sec61 from different organisms, making this a promising target for therapeutic intervention. To understand the mode of inhibition and provide insight into the molecular mechanism of this dynamic translocon, we determined the structure of mammalian Sec61 inhibited by the Mycobacterium ulcerans exotoxin mycolactone via electron cryo-microscopy. Unexpectedly, the conformation of inhibited Sec61 is optimal for substrate engagement, with mycolactone wedging open the cytosolic side of the lateral gate. The inability of mycolactone-inhibited Sec61 to effectively transport substrate proteins implies that signal peptides and transmembrane domains pass through the site occupied by mycolactone. This provides a foundation for understanding the molecular mechanism of Sec61 inhibitors and reveals novel features of translocon function and dynamics.
History
Deposition
May 21, 2020
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Header (metadata) release
Jul 22, 2020
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Map release
Jul 22, 2020
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Update
May 22, 2024
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Current status
May 22, 2024
Processing site: PDBe / Status: Released
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Structure visualization
Movie
Surface view with section colored by density value
Model: Quantifoil R1.2/1.3 / Material: COPPER / Mesh: 200 / Support film - Material: GRAPHENE OXIDE
Vitrification
Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277.15 K / Instrument: FEI VITROBOT MARK IV Details: Blot time 5 seconds Blot force -15 Incubation time 15 seconds.
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Electron microscopy
Microscope
FEI TITAN KRIOS
Image recording
Film or detector model: GATAN K2 QUANTUM (4k x 4k) / Average electron dose: 49.0 e/Å2
Electron beam
Acceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron optics
Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
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Image processing
Particle selection
Number selected: 108129
Startup model
Type of model: EMDB MAP
Final reconstruction
Applied symmetry - Point group: C1 (asymmetric) / Resolution.type: BY AUTHOR / Resolution: 2.69 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 3) / Number images used: 45733
Initial angle assignment
Type: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 3)
Final angle assignment
Type: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 3)
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