2WWB

CRYO-EM STRUCTURE OF THE MAMMALIAN SEC61 COMPLEX BOUND TO THE ACTIVELY TRANSLATING WHEAT GERM 80S RIBOSOME


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 6.48 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 2.0 of the entry. See complete history


Literature

Structure of Monomeric Yeast and Mammalian Sec61 Complexes Interacting with the Translating Ribosome.

Becker, T.Bhushan, S.Jarasch, A.Armache, J.P.Funes, S.Jossinet, F.Gumbart, J.Mielke, T.Berninghausen, O.Schulten, K.Westhof, E.Gilmore, R.Mandon, E.Beckmann, R.

(2009) Science 326: 1369

  • DOI: 10.1126/science.1178535
  • Primary Citation of Related Structures:  
    2WW9, 2WWA, 2WWB

  • PubMed Abstract: 
  • The trimeric Sec61/SecY complex is a protein-conducting channel (PCC) for secretory and membrane proteins. Although Sec complexes can form oligomers, it has been suggested that a single copy may serve as an active PCC. We determined subnanometer-resolution cryo-electron microscopy structures of eukaryotic ribosome-Sec61 complexes ...

    The trimeric Sec61/SecY complex is a protein-conducting channel (PCC) for secretory and membrane proteins. Although Sec complexes can form oligomers, it has been suggested that a single copy may serve as an active PCC. We determined subnanometer-resolution cryo-electron microscopy structures of eukaryotic ribosome-Sec61 complexes. In combination with biochemical data, we found that in both idle and active states, the Sec complex is not oligomeric and interacts mainly via two cytoplasmic loops with the universal ribosomal adaptor site. In the active state, the ribosomal tunnel and a central pore of the monomeric PCC were occupied by the nascent chain, contacting loop 6 of the Sec complex. This provides a structural basis for the activity of a solitary Sec complex in cotranslational protein translocation.


    Organizational Affiliation

    Gene Center Munich and Center for Integrated Protein Science, Department of Chemistry and Biochemistry, Ludwig-Maximilians-Universität München, Feodor-Lynen-Strasse 25, 81377 Munich, Germany.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
PROTEIN TRANSPORT PROTEIN SEC61 SUBUNIT ALPHA ISOFORM 1A476Canis lupus familiarisMutation(s): 0 
Gene Names: SEC61A1
Membrane Entity: Yes 
UniProt
Find proteins for P38377 (Canis lupus familiaris)
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UniProt GroupP38377
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
PROTEIN TRANSPORT PROTEIN SEC61 SUBUNIT GAMMAB68Canis lupus familiarisMutation(s): 0 
Gene Names: SEC61G
Membrane Entity: Yes 
UniProt
Find proteins for P60058 (Canis lupus familiaris)
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
PROTEIN TRANSPORT PROTEIN SEC61 SUBUNIT BETAC96Canis lupus familiarisMutation(s): 0 
Gene Names: SEC61B
Membrane Entity: Yes 
UniProt
Find proteins for P60467 (Canis lupus familiaris)
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UniProt GroupP60467
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Entity ID: 8
MoleculeChainsSequence LengthOrganismDetailsImage
60S RIBOSOMAL PROTEIN L4-BH362Triticum aestivumMutation(s): 0 
UniProt
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Entity ID: 9
MoleculeChainsSequence LengthOrganismDetailsImage
60S RIBOSOMAL PROTEIN L17-AI184Triticum aestivumMutation(s): 0 
UniProt
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Entity ID: 10
MoleculeChainsSequence LengthOrganismDetailsImage
60S RIBOSOMAL PROTEIN L19J189Triticum aestivumMutation(s): 0 
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Entity ID: 11
MoleculeChainsSequence LengthOrganismDetailsImage
60S RIBOSOMAL PROTEIN L25K142Triticum aestivumMutation(s): 0 
UniProt
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Entity ID: 12
MoleculeChainsSequence LengthOrganismDetailsImage
60S RIBOSOMAL PROTEIN L26-AL127Triticum aestivumMutation(s): 0 
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Entity ID: 13
MoleculeChainsSequence LengthOrganismDetailsImage
60S RIBOSOMAL PROTEIN L31-AM113Triticum aestivumMutation(s): 0 
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Entity ID: 14
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60S RIBOSOMAL PROTEIN L35N120Triticum aestivumMutation(s): 0 
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Entity ID: 15
MoleculeChainsSequence LengthOrganismDetailsImage
60S RIBOSOMAL PROTEIN L39O51Triticum aestivumMutation(s): 0 
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Entity ID: 4
MoleculeChainsLengthOrganismImage
5.8S RRNAD63Triticum aestivum
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Entity ID: 5
MoleculeChainsLengthOrganismImage
25S RRNAE34Triticum aestivum
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Entity ID: 6
MoleculeChainsLengthOrganismImage
25S RRNAF25Triticum aestivum
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Entity ID: 7
MoleculeChainsLengthOrganismImage
25S RRNAG14Triticum aestivum
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Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 6.48 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2009-12-08
    Type: Initial release
  • Version 1.1: 2011-07-20
    Changes: Database references, Derived calculations, Other, Refinement description, Source and taxonomy, Structure summary
  • Version 1.2: 2017-04-19
    Changes: Other
  • Version 2.0: 2018-10-03
    Changes: Atomic model, Data collection, Derived calculations