7T5W

Structure of E. coli CapH C-terminal domain


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.211 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

A conserved signaling pathway activates bacterial CBASS immune signaling in response to DNA damage.

Lau, R.K.Enustun, E.Gu, Y.Nguyen, J.V.Corbett, K.D.

(2022) EMBO J 41: e111540-e111540

  • DOI: https://doi.org/10.15252/embj.2022111540
  • Primary Citation of Related Structures:  
    7T5T, 7T5U, 7T5V, 7T5W

  • PubMed Abstract: 

    To protect themselves from the constant threat of bacteriophage (phage) infection, bacteria have evolved diverse immune systems including restriction-modification, CRISPR-Cas, and many others. Here, we describe the discovery of a two-protein transcriptional regulator module associated with hundreds of CBASS immune systems and demonstrate that this module drives the expression of its associated CBASS system in response to DNA damage. We show that the helix-turn-helix transcriptional repressor CapH binds the promoter region of its associated CBASS system to repress transcription until it is cleaved by the metallopeptidase CapP. CapP is activated in vitro by single-stranded DNA, and in cells by DNA-damaging drugs. Together, CapH and CapP drive increased expression of their associated CBASS system in response to DNA damage. We identify CapH- and CapP-related proteins associated with diverse known and putative bacterial immune systems including DISARM and Pycsar antiphage operons. Overall, our data highlight a mechanism by which bacterial immune systems can sense and respond to a universal signal of cell stress, potentially enabling multiple immune systems to mount a coordinated defensive response against an invading pathogen.


  • Organizational Affiliation

    Department of Cellular and Molecular Medicine, University of California, San Diego, La Jolla, CA, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Helix-turn-helix domain-containing protein
A, B, C, D
44Escherichia coliMutation(s): 0 
Gene Names: nadR_1BHS87_27750D9K17_19515GRQ19_13110HV109_14215NCTC13216_00230
UniProt
Find proteins for A0A1X1LKI5 (Escherichia coli)
Explore A0A1X1LKI5 
Go to UniProtKB:  A0A1X1LKI5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A1X1LKI5
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

Unit Cell:
Length ( Å )Angle ( ˚ )
a = 44.023α = 90
b = 39.855β = 98.731
c = 46.256γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling
PHASERphasing

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 StatesR21 AI148814

Revision History  (Full details and data files)

  • Version 1.0: 2022-09-14
    Type: Initial release
  • Version 1.1: 2022-10-12
    Changes: Database references
  • Version 1.2: 2022-11-30
    Changes: Database references
  • Version 1.3: 2023-10-25
    Changes: Data collection, Refinement description