8EE4

Structure of PtuA


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.60 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

PtuA and PtuB assemble into an inflammasome-like oligomer for anti-phage defense.

Li, Y.Shen, Z.Zhang, M.Yang, X.Y.Cleary, S.P.Xie, J.Marathe, I.A.Kostelic, M.Greenwald, J.Rish, A.D.Wysocki, V.H.Chen, C.Chen, Q.Fu, T.M.Yu, Y.

(2024) Nat Struct Mol Biol 31: 413-423

  • DOI: https://doi.org/10.1038/s41594-023-01172-8
  • Primary Citation of Related Structures:  
    8EE4, 8EE7, 8EEA, 8SUX

  • PubMed Abstract: 

    Escherichia coli Septu system, an anti-phage defense system, comprises two components: PtuA and PtuB. PtuA contains an ATPase domain, while PtuB is predicted to function as a nuclease. Here we show that PtuA and PtuB form a stable complex with a 6:2 stoichiometry. Cryo-electron microscopy structure of PtuAB reveals a distinctive horseshoe-like configuration. PtuA adopts a hexameric arrangement, organized as an asymmetric trimer of dimers, contrasting the ring-like structure by other ATPases. Notably, the three pairs of PtuA dimers assume distinct conformations and fulfill unique roles in recruiting PtuB. Our functional assays have further illuminated the importance of the oligomeric assembly of PtuAB in anti-phage defense. Moreover, we have uncovered that ATP molecules can directly bind to PtuA and inhibit the activities of PtuAB. Together, the assembly and function of the Septu system shed light on understanding other ATPase-containing systems in bacterial immunity.


  • Organizational Affiliation

    Department of Biotherapy, Cancer Center and State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, P. R. China.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
PtuA
A, B, C, D, E
A, B, C, D, E, F
465Escherichia coliMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.60 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Not funded--

Revision History  (Full details and data files)

  • Version 1.0: 2024-01-03
    Type: Initial release
  • Version 1.1: 2024-01-10
    Changes: Database references
  • Version 1.2: 2024-01-17
    Changes: Database references
  • Version 1.3: 2024-04-03
    Changes: Database references