6N38

Structure of the type VI secretion system TssK-TssF-TssG baseplate subcomplex revealed by cryo-electron microscopy - full map sharpened


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.70 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

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Literature

Structure of the type VI secretion system TssK-TssF-TssG baseplate subcomplex revealed by cryo-electron microscopy.

Park, Y.J.Lacourse, K.D.Cambillau, C.DiMaio, F.Mougous, J.D.Veesler, D.

(2018) Nat Commun 9: 5385-5385

  • DOI: 10.1038/s41467-018-07796-5
  • Primary Citation of Related Structures:  
    6N38

  • PubMed Abstract: 
  • Type VI secretion systems (T6SSs) translocate effectors into target cells and are made of a contractile sheath and a tube docked onto a multi-protein transmembrane complex via a baseplate. Although some information is available about the mechanisms of tail contraction leading to effector delivery, the detailed architecture and function of the baseplate remain unknown ...

    Type VI secretion systems (T6SSs) translocate effectors into target cells and are made of a contractile sheath and a tube docked onto a multi-protein transmembrane complex via a baseplate. Although some information is available about the mechanisms of tail contraction leading to effector delivery, the detailed architecture and function of the baseplate remain unknown. Here, we report the 3.7 Å resolution cryo-electron microscopy reconstruction of an enteroaggregative Escherichia coli baseplate subcomplex assembled from TssK, TssF and TssG. The structure reveals two TssK trimers interact with a locally pseudo-3-fold symmetrical complex comprising two copies of TssF and one copy of TssG. TssF and TssG are structurally related to each other and to components of the phage T4 baseplate and of the type IV secretion system, strengthening the evolutionary relationships among these macromolecular machines. These results, together with bacterial two-hybrid assays, provide a structural framework to understand the T6SS baseplate architecture.


    Organizational Affiliation

    Department of Biochemistry, University of Washington, Seattle, WA, 98195, USA. dveesler@uw.edu.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Putative type VI secretion proteinC [auth H],
A [auth I]
587Escherichia coli 042Mutation(s): 0 
Gene Names: EC042_4542
UniProt
Find proteins for D3GUX3 (Escherichia coli O44:H18 (strain 042 / EAEC))
Explore D3GUX3 
Go to UniProtKB:  D3GUX3
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UniProt GroupD3GUX3
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Putative type VI secretion proteinB [auth G]303Escherichia coli 042Mutation(s): 0 
Gene Names: EC042_4543
UniProt
Find proteins for D3GUX4 (Escherichia coli O44:H18 (strain 042 / EAEC))
Explore D3GUX4 
Go to UniProtKB:  D3GUX4
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UniProt GroupD3GUX4
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Unassigned proteinD [auth K],
E [auth L]
21Escherichia coli 042Mutation(s): 0 
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Putative type VI secretion protein322Escherichia coli 042Mutation(s): 0 
Gene Names: EC042_4526
UniProt
Find proteins for D3GU39 (Escherichia coli O44:H18 (strain 042 / EAEC))
Explore D3GU39 
Go to UniProtKB:  D3GU39
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupD3GU39
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Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.70 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United StatesHHSN272201700059C

Revision History  (Full details and data files)

  • Version 1.0: 2018-12-26
    Type: Initial release
  • Version 1.1: 2019-01-02
    Changes: Data collection, Database references
  • Version 1.2: 2019-12-18
    Changes: Author supporting evidence