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.




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
mpstruct
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
mpstruct
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
mpstruct
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

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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