4Z9C

EcPltAB Oxidized


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.35 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.195 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structure and function analyses of a pertussis-like toxin from pathogenic Escherichia coli reveal a distinct mechanism of inhibition of trimeric G proteins.

Littler, D.R.Ang, S.Y.Moriel, D.G.Kocan, M.Kleifeld, O.Johnson, M.D.Tran, M.T.Paton, A.W.Paton, J.C.Summers, R.Schrembri, M.Rossjohn, J.Beddoe, T.T.

(2017) J Biol Chem 

  • DOI: 10.1074/jbc.M117.796094
  • Primary Citation of Related Structures:  
    4Z9C, 4Z9D

  • PubMed Abstract: 
  • Pertussis-like toxins are secreted by several bacterial pathogens during infection. They belong to the AB 5 virulence factors, which bind to glycans on host cell membranes for internalization. Host cell recognition and internalization are mediated by toxin B subunits sharing a unique pentameric ring-like assembly ...

    Pertussis-like toxins are secreted by several bacterial pathogens during infection. They belong to the AB 5 virulence factors, which bind to glycans on host cell membranes for internalization. Host cell recognition and internalization are mediated by toxin B subunits sharing a unique pentameric ring-like assembly. Although the role of pertussis toxin in whooping cough is well-established, pertussis-like toxins produced by other bacteria are less studied, and their mechanisms of action are unclear. Here, we report that some extra-intestinal Escherichia coli pathogens ( i.e. those that reside in the gut but can spread to other bodily locations) encode a pertussis-like toxin that inhibits mammalian cell growth in vitro We found that this protein, Ec Plt, is related to toxins produced by both nontyphoidal and typhoidal Salmonella serovars. Pertussis-like toxins are secreted as disulfide-bonded heterohexamers in which the catalytic ADP-ribosyltransferase subunit is activated when exposed to the reducing environment in mammalian cells. We found here that the reduced Ec Plt exhibits large structural rearrangements associated with its activation. We noted that inhibitory residues tethered within the NAD + -binding site by an intramolecular disulfide in the oxidized state dissociate upon the reduction and enable loop restructuring to form the nucleotide-binding site. Surprisingly, although pertussis toxin targets a cysteine residue within the α subunit of inhibitory trimeric G-proteins, we observed that activated Ec Plt toxin modifies a proximal lysine/asparagine residue instead. In conclusion, our results reveal the molecular mechanism underpinning activation of pertussis-like toxins, and we also identified differences in host target specificity.


    Organizational Affiliation

    the Department of Animal, Plant and Soil Science and Centre for AgriBioscience, La Trobe University, Bundoora, Victoria 3086, Australia t.beddoe@latrobe.edu.au.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Pertussis toxin-like subunit ArtAA241Escherichia coliMutation(s): 0 
Gene Names: PU15_14675PU38_26245ptxAAC067_20715BvCms12BK_04756BvCmsHHP056_05356BvCmsSINP011_00392DEN86_05925FRV13_09350
EC: 2.4.2.30
UniProt
Find proteins for A0A0B1KWV6 (Escherichia coli)
Explore A0A0B1KWV6 
Go to UniProtKB:  A0A0B1KWV6
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Subtilase cytotoxin subunit B-like proteinB, C, D, E, F127Escherichia coliMutation(s): 0 
Gene Names: PU15_14670PU38_26240
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PO4
Query on PO4

Download Ideal Coordinates CCD File 
G [auth A]PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.35 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.195 
  • Space Group: P 65
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 160.9α = 90
b = 160.9β = 90
c = 62.64γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
MOSFLMdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-10-12
    Type: Initial release
  • Version 1.1: 2017-08-09
    Changes: Data collection, Database references, Derived calculations