3JC2

The structure of the mammalian Sec61 channel opened by a signal sequence

Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.6 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history. 

Literature

Structure of the Sec61 channel opened by a signal sequence.

Voorhees, R.M., Hegde, R.S.

(2016) Science 351: 88-91

  • DOI: 10.1126/science.aad4992

  • PubMed Abstract: 

    • Secreted and integral membrane proteins compose up to one-third of the biological proteome. These proteins contain hydrophobic signals that direct their translocation across or insertion into the lipid bilayer by the Sec61 protein-conducting channel. ...

    Secreted and integral membrane proteins compose up to one-third of the biological proteome. These proteins contain hydrophobic signals that direct their translocation across or insertion into the lipid bilayer by the Sec61 protein-conducting channel. The molecular basis of how hydrophobic signals within a nascent polypeptide trigger channel opening is not understood. Here, we used cryo-electron microscopy to determine the structure of an active Sec61 channel that has been opened by a signal sequence. The signal supplants helix 2 of Sec61α, which triggers a rotation that opens the central pore both axially across the membrane and laterally toward the lipid bilayer. Comparisons with structures of Sec61 in other states suggest a pathway for how hydrophobic signals engage the channel to gain access to the lipid bilayer.

    Organizational Affiliation: 

    MRC Laboratory of Molecular Biology, Medical Research Council, Francis Crick Avenue, Cambridge CB2 0QH, UK. rhegde@mrc-lmb.cam.ac.uk.,MRC Laboratory of Molecular Biology, Medical Research Council, Francis Crick Avenue, Cambridge CB2 0QH, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Protein transport protein Sec61 subunit alpha isoform 1
1
476Canis lupus familiarisMutation(s): 0 
Gene Names: SEC61A1
Membrane protein
mpstruc		Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL		Sub Group: 
Sec and Translocase Proteins		Protein: 
Sec61 translocase opened by a signal sequence
Find proteins for P38377 (Canis lupus familiaris)
Go to Gene View: SEC61A1
Go to UniProtKB:  P38377
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Protein transport protein Sec61 subunit gamma
2
62Canis lupus familiarisMutation(s): 0 
Gene Names: SEC61G
Membrane protein
mpstruc		Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL		Sub Group: 
Sec and Translocase Proteins		Protein: 
Sec61 translocase opened by a signal sequence
Find proteins for P60058 (Canis lupus familiaris)
Go to Gene View: SEC61G
Go to UniProtKB:  P60058
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Prolactin
w
19Bos taurusMutation(s): 0 
Gene Names: PRL
Membrane protein
mpstruc		Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL		Sub Group: 
Sec and Translocase Proteins		Protein: 
Sec61 translocase opened by a signal sequence
Find proteins for P01239 (Bos taurus)
Go to Gene View: PRL
Go to UniProtKB:  P01239
Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
Protein transport protein Sec61 subunit beta
3
32N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
UNK
Query on UNK
3
L-PEPTIDE LINKINGC4 H9 N O2

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Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.6 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2016-01-13
    Type: Initial release
  • Version 1.1: 2018-07-18
    Type: Data collection