6H3I

Structural snapshots of the Type 9 protein translocon


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.50 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

Type 9 secretion system structures reveal a new protein transport mechanism.

Lauber, F.Deme, J.C.Lea, S.M.Berks, B.C.

(2018) Nature 564: 77-82

  • DOI: 10.1038/s41586-018-0693-y
  • Primary Citation of Related Structures:  
    6H3I, 6H3J

  • PubMed Abstract: 
  • The type 9 secretion system (T9SS) is the protein export pathway of bacteria of the Gram-negative Fibrobacteres-Chlorobi-Bacteroidetes superphylum and is an essential determinant of pathogenicity in severe periodontal disease. The central element of the T9SS is a so-far uncharacterized protein-conducting translocon located in the bacterial outer membrane ...

    The type 9 secretion system (T9SS) is the protein export pathway of bacteria of the Gram-negative Fibrobacteres-Chlorobi-Bacteroidetes superphylum and is an essential determinant of pathogenicity in severe periodontal disease. The central element of the T9SS is a so-far uncharacterized protein-conducting translocon located in the bacterial outer membrane. Here, using cryo-electron microscopy, we provide structural evidence that the translocon is the T9SS protein SprA. SprA forms an extremely large (36-strand) single polypeptide transmembrane β-barrel. The barrel pore is capped on the extracellular end, but has a lateral opening to the external membrane surface. Structures of SprA bound to different components of the T9SS show that partner proteins control access to the lateral opening and to the periplasmic end of the pore. Our results identify a protein transporter with a distinctive architecture that uses an alternating access mechanism in which the two ends of the protein-conducting channel are open at different times.


    Organizational Affiliation

    Department of Biochemistry, University of Oxford, Oxford, UK. ben.berks@bioch.ox.ac.uk.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Protein involved in gliding motility SprAA2403Flavobacterium johnsoniaeMutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for Q5I6C7 (Flavobacterium johnsoniae (strain ATCC 17061 / DSM 2064 / JCM 8514 / NBRC 14942 / NCIMB 11054 / UW101))
Explore Q5I6C7 
Go to UniProtKB:  Q5I6C7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ5I6C7
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Peptidyl-prolyl cis-trans isomeraseB176Flavobacterium johnsoniaeMutation(s): 0 
EC: 5.2.1.8
UniProt
Find proteins for A5F9W9 (Flavobacterium johnsoniae (strain ATCC 17061 / DSM 2064 / JCM 8514 / NBRC 14942 / NCIMB 11054 / UW101))
Explore A5F9W9 
Go to UniProtKB:  A5F9W9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA5F9W9
Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
PorVC [auth F]402Flavobacterium johnsoniaeMutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for A5FJM7 (Flavobacterium johnsoniae (strain ATCC 17061 / DSM 2064 / JCM 8514 / NBRC 14942 / NCIMB 11054 / UW101))
Explore A5FJM7 
Go to UniProtKB:  A5FJM7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA5FJM7
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.50 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data

  • Deposited Date: 2018-07-18 
  • Released Date: 2018-11-07 
  • Deposition Author(s): Deme, J.C., Lea, S.M.

Funding OrganizationLocationGrant Number
Wellcome TrustUnited Kingdom107929/Z/15/Z
Wellcome TrustUnited Kingdom100298

Revision History  (Full details and data files)

  • Version 1.0: 2018-11-07
    Type: Initial release
  • Version 1.1: 2018-11-21
    Changes: Data collection, Database references
  • Version 1.2: 2018-12-12
    Changes: Data collection, Database references
  • Version 1.3: 2019-12-11
    Changes: Other