4NTQ

CdiA-CT/CdiI toxin and immunity complex from Enterobacter cloacae


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.183 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

CdiA from Enterobacter cloacae Delivers a Toxic Ribosomal RNase into Target Bacteria.

Beck, C.M.Morse, R.P.Cunningham, D.A.Iniguez, A.Low, D.A.Goulding, C.W.Hayes, C.S.

(2014) Structure 22: 1-12

  • DOI: 10.1016/j.str.2014.02.012

  • PubMed Abstract: 
  • Contact-dependent growth inhibition (CDI) is one mechanism of inter-bacterial competition. CDI(+) cells export large CdiA effector proteins, which carry a variety of C-terminal toxin domains (CdiA-CT). CdiA-CT toxins are specifically neutralized by c ...

    Contact-dependent growth inhibition (CDI) is one mechanism of inter-bacterial competition. CDI(+) cells export large CdiA effector proteins, which carry a variety of C-terminal toxin domains (CdiA-CT). CdiA-CT toxins are specifically neutralized by cognate CdiI immunity proteins to protect toxin-producing cells from autoinhibition. Here, we use structure determination to elucidate the activity of a CDI toxin from Enterobacter cloacae (ECL). The structure of CdiA-CT(ECL) resembles the C-terminal nuclease domain of colicin E3, which cleaves 16S ribosomal RNA to disrupt protein synthesis. In accord with this structural homology, we show that CdiA-CT(ECL) uses the same nuclease activity to inhibit bacterial growth. Surprisingly, although colicin E3 and CdiA(ECL) carry equivalent toxin domains, the corresponding immunity proteins are unrelated in sequence, structure, and toxin-binding site. Together, these findings reveal unexpected diversity among 16S rRNases and suggest that these nucleases are robust and versatile payloads for a variety of toxin-delivery platforms.


    Organizational Affiliation

    Department of Molecular, Cellular, and Developmental Biology, University of California, Santa Barbara, Santa Barbara, CA 93106-9625, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Contact-dependent inhibitor A
A
235Enterobacter cloacae subsp. cloacae (strain ATCC 13047 / DSM 30054 / NBRC 13535 / NCDC 279-56)Mutation(s): 0 
Gene Names: cdiA
EC: 3.1.-.-
Find proteins for D5CBA0 (Enterobacter cloacae subsp. cloacae (strain ATCC 13047 / DSM 30054 / NBRC 13535 / NCDC 279-56))
Go to UniProtKB:  D5CBA0
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
ECL CdiI
B
155Enterobacter cloacae subsp. cloacae (strain ATCC 13047 / DSM 30054 / NBRC 13535 / NCDC 279-56)Mutation(s): 0 
Gene Names: cdiI,
Find proteins for A0A023GPJ0 (Enterobacter cloacae subsp. cloacae (strain ATCC 13047 / DSM 30054 / NBRC 13535 / NCDC 279-56))
Go to UniProtKB:  A0A023GPJ0
Find proteins for A0A0X1KGI7 (Enterobacter cloacae subsp. cloacae (strain ATCC 13047 / DSM 30054 / NBRC 13535 / NCDC 279-56))
Go to UniProtKB:  A0A0X1KGI7
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A, B
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.183 
  • Space Group: P 41 2 2
Unit Cell:
Length (Å)Angle (°)
a = 85.250α = 90.00
b = 85.250β = 90.00
c = 74.913γ = 90.00
Software Package:
Software NamePurpose
PHENIXphasing
HKL-2000data reduction
HKL-2000data scaling
Blu-Icedata collection
PHENIXrefinement
PHENIXmodel building

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-03-26
    Type: Initial release
  • Version 1.1: 2014-05-14
    Type: Database references