6CKA

Crystal Structure of Paratox


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.559 Å
  • R-Value Free: 0.183 
  • R-Value Work: 0.162 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The conserved mosaic prophage protein paratox inhibits the natural competence regulator ComR in Streptococcus.

Mashburn-Warren, L.Goodman, S.D.Federle, M.J.Prehna, G.

(2018) Sci Rep 8: 16535-16535

  • DOI: 10.1038/s41598-018-34816-7

  • PubMed Abstract: 
  • Horizontal gene transfer is an important means of bacterial evolution. This includes natural genetic transformation, where bacterial cells become "competent" and DNA is acquired from the extracellular environment. Natural competence in many species o ...

    Horizontal gene transfer is an important means of bacterial evolution. This includes natural genetic transformation, where bacterial cells become "competent" and DNA is acquired from the extracellular environment. Natural competence in many species of Streptococcus, is regulated by quorum sensing via the ComRS receptor-signal pair. The ComR-XIP (mature ComS peptide) complex induces expression of the alternative sigma factor SigX, which targets RNA polymerase to CIN-box promoters to activate genes involved in DNA uptake and recombination. In addition, the widely distributed Streptococcus prophage gene paratox (prx) also contains a CIN-box, and here we demonstrate it to be transcriptionally activated by XIP. In vitro experiments demonstrate that Prx binds ComR directly and prevents the ComR-XIP complex from interacting with DNA. Mutations of prx in vivo caused increased expression of the late competence gene ssb when induced with XIP as compared to wild-type, and Prx orthologues are able to inhibit ComR activation by XIP in a reporter strain which lacks an endogenous prx. Additionally, an X-ray crystal structure of Prx reveals a unique fold that implies a novel molecular mechanism to inhibit ComR. Overall, our results suggest Prx functions to inhibit the acquisition of new DNA by Streptococcus.


    Organizational Affiliation

    Center for Microbial Pathogenesis, The Research Institute at Nationwide Children's Hospital, Columbus, Ohio, USA.,Department of Microbiology, University of Manitoba, Winnipeg, Manitoba, Canada. gerd.prehna@umanitoba.ca.,Department of Medicinal Chemistry and Pharmacognosy, Center for Biomolecular Sciences, University of Illinois at Chicago, Chicago, Illinois, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Paratox
A, B
68Streptococcus pyogenes serotype M3 (strain ATCC BAA-595 / MGAS315)Mutation(s): 0 
Find proteins for A0A0H2UWN8 (Streptococcus pyogenes serotype M3 (strain ATCC BAA-595 / MGAS315))
Go to UniProtKB:  A0A0H2UWN8
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: 1.559 Å
  • R-Value Free: 0.183 
  • R-Value Work: 0.162 
  • Space Group: P 2 21 21
Unit Cell:
Length (Å)Angle (°)
a = 26.689α = 90.00
b = 56.816β = 90.00
c = 88.372γ = 90.00
Software Package:
Software NamePurpose
PHENIXmodel building
CRANK2phasing
PHENIXphasing
XDSdata scaling
PHENIXrefinement
XDSdata reduction
Cootmodel building

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data

  • Deposited Date: 2018-02-27 
  • Released Date: 2018-11-14 
  • Deposition Author(s): Prehna, G.

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious DiseasesUnited StatesR01AI091779
Natural Sciences and Engineering Research Council (Canada)CanadaRGPIN-2018-04968

Revision History 

  • Version 1.0: 2018-11-14
    Type: Initial release
  • Version 1.1: 2018-11-21
    Type: Author supporting evidence, Data collection, Database references
  • Version 1.2: 2019-02-20
    Type: Author supporting evidence, Data collection