7AFT

Cryo-EM structure of the signal sequence-engaged post-translational Sec translocon


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.40 Å
  • Resolution: 4.40 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Architecture of the active post-translational Sec translocon.

Weng, T.H.Steinchen, W.Beatrix, B.Berninghausen, O.Becker, T.Bange, G.Cheng, J.Beckmann, R.

(2021) EMBO J 40: e105643-e105643

  • DOI: 10.15252/embj.2020105643
  • Primary Citation of Related Structures:  
    6ZZZ, 7AFT

  • PubMed Abstract: 
  • In eukaryotes, most secretory and membrane proteins are targeted by an N-terminal signal sequence to the endoplasmic reticulum, where the trimeric Sec61 complex serves as protein-conducting channel (PCC). In the post-translational mode, fully synthesized proteins are recognized by a specialized channel additionally containing the Sec62, Sec63, Sec71, and Sec72 subunits ...

    In eukaryotes, most secretory and membrane proteins are targeted by an N-terminal signal sequence to the endoplasmic reticulum, where the trimeric Sec61 complex serves as protein-conducting channel (PCC). In the post-translational mode, fully synthesized proteins are recognized by a specialized channel additionally containing the Sec62, Sec63, Sec71, and Sec72 subunits. Recent structures of this Sec complex in the idle state revealed the overall architecture in a pre-opened state. Here, we present a cryo-EM structure of the yeast Sec complex bound to a substrate, and a crystal structure of the Sec62 cytosolic domain. The signal sequence is inserted into the lateral gate of Sec61α similar to previous structures, yet, with the gate adopting an even more open conformation. The signal sequence is flanked by two Sec62 transmembrane helices, the cytoplasmic N-terminal domain of Sec62 is more rigidly positioned, and the plug domain is relocated. We crystallized the Sec62 domain and mapped its interaction with the C-terminus of Sec63. Together, we obtained a near-complete and integrated model of the active Sec complex.


    Organizational Affiliation

    Gene Center Munich, Department of Biochemistry, University of Munich, Munich, Germany.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Protein transport protein SEC61A480Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: SEC61YLR378CL3502.5
Membrane Entity: Yes 
UniProt
Find proteins for P32915 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Protein transport protein SBH1B82Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: SBH1SEB1YER087C-BYER087BC
Membrane Entity: Yes 
UniProt
Find proteins for P52870 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Protein transport protein SSS1C80Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: SSS1YDR086CD4475
Membrane Entity: Yes 
UniProt
Find proteins for P35179 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
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  • Reference Sequence
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Protein translocation protein SEC63D663Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: SEC63NPL1PTL1YOR254C
Membrane Entity: Yes 
UniProt
Find proteins for P14906 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
Translocation protein SEC66E206Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: SEC66HSS1SEC71YBR171WYBR1232
Membrane Entity: Yes 
UniProt
Find proteins for P33754 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
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Entity ID: 6
MoleculeChainsSequence LengthOrganismDetailsImage
Translocation protein SEC72F193Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: SEC72SEC67SIM2YLR292CL8003.18
UniProt
Find proteins for P39742 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
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  • Reference Sequence
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Entity ID: 7
MoleculeChainsSequence LengthOrganismDetailsImage
Translocation protein SEC62,Translocation protein SEC62G324Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: SEC62YPL094CLPG14C
Membrane Entity: Yes 
UniProt
Find proteins for P21825 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
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Entity ID: 8
MoleculeChainsSequence LengthOrganismDetailsImage
Mating factor alpha-1,Mating factor alpha-1H178Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: MF(ALPHA)1MF-ALPHA-1MFAL1YPL187W
Membrane Entity: Yes 
UniProt
Find proteins for P01149 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.40 Å
  • Resolution: 4.40 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2020-12-02
    Type: Initial release
  • Version 1.1: 2020-12-30
    Changes: Database references
  • Version 1.2: 2021-02-10
    Changes: Database references