6N3Q

Cryo-EM structure of the yeast Sec complex


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.68 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Structure of the posttranslational Sec protein-translocation channel complex from yeast.

Itskanov, S.Park, E.

(2019) Science 363: 84-87

  • DOI: 10.1126/science.aav6740
  • Structures With Same Primary Citation

  • PubMed 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 transport is enabled by two additional membrane protei ...

    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 Saccharomyces cerevisiae 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.


    Organizational Affiliation

    Department of Molecular and Cell Biology and California Institute for Quantitative Biosciences, University of California, Berkeley, Berkeley, CA 94720, USA. eunyong_park@berkeley.edu.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Protein transport protein SEC61
A
480Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: SEC61YLR378CL3502.5
Find proteins for P32915 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to UniProtKB:  P32915

Find similar proteins by: Sequence  |  Structure

Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Protein transport protein SSS1
C
80Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: SSS1YDR086CD4475
Find proteins for P35179 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to UniProtKB:  P35179

Find similar proteins by: Sequence  |  Structure

Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Protein transport protein SBH1
B
82Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: SBH1SEB1YER087C-BYER087BC
Find proteins for P52870 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to UniProtKB:  P52870

Find similar proteins by: Sequence  |  Structure

Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
Protein translocation protein SEC63
D
663Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: SEC63NPL1PTL1YOR254C
Find proteins for P14906 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to UniProtKB:  P14906

Find similar proteins by: Sequence  |  Structure

Entity ID: 5
MoleculeChainsSequence LengthOrganismDetails
Translocation protein SEC66
E
206Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: SEC66HSS1SEC71YBR171WYBR1232
Find proteins for P33754 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to UniProtKB:  P33754

Find similar proteins by: Sequence  |  Structure

Entity ID: 6
MoleculeChainsSequence LengthOrganismDetails
Translocation protein SEC72
F
193Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: SEC72SEC67SIM2YLR292CL8003.18
Find proteins for P39742 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to UniProtKB:  P39742
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.68 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

  • Deposited Date: 2018-11-16 
  • Released Date: 2018-12-19 
  • Deposition Author(s): Park, E., Itskanov, S.

Revision History 

  • Version 1.0: 2018-12-19
    Type: Initial release
  • Version 1.1: 2018-12-26
    Changes: Data collection, Database references
  • Version 1.2: 2019-01-16
    Changes: Data collection, Database references
  • Version 1.3: 2019-12-18
    Changes: Other