4YZE

Crystal structure of E.coli NemR reduced form


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.205 
  • R-Value Observed: 0.207 

Starting Model: experimental
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This is version 1.2 of the entry. See complete history


Literature

Does the Transcription Factor NemR Use a Regulatory Sulfenamide Bond to Sense Bleach?

Gray, M.J.Li, Y.Leichert, L.I.Xu, Z.Jakob, U.

(2015) Antioxid Redox Signal 23: 747-754

  • DOI: https://doi.org/10.1089/ars.2015.6346
  • Primary Citation of Related Structures:  
    4YZE

  • PubMed Abstract: 

    Reactive chlorine species (RCS), such as hypochlorous acid (i.e., bleach), are antimicrobial oxidants produced by the innate immune system. Like many redox-regulated transcription factors, the Escherichia coli repressor NemR responds to RCS by using the reversible oxidation of highly conserved cysteines to alter its DNA-binding affinity. However, earlier work showed that RCS response in NemR does not depend on any commonly known oxidative cysteine modifications. We have now determined the crystal structure of NemR, showing that the regulatory cysteine, Cys106, is in close proximity to a highly conserved lysine (Lys175). We used crystallographic, biochemical, and mass spectrometric analyses to analyze the role of this lysine residue in RCS sensing. Based on our results, we hypothesize that RCS treatment of NemR results in the formation of a reversible Cys106-Lys175 sulfenamide bond. This is, to our knowledge, the first description of a protein whose function is regulated by a cysteine-lysine sulfenamide thiol switch, constituting a novel addition to the biological repertoire of functional redox switches.


  • Organizational Affiliation

    1 Department of Molecular, Cellular, and Developmental Biology, University of Michigan , Ann Arbor, Michigan.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
HTH-type transcriptional repressor NemR
A, B, C, D
201Escherichia coli K-12Mutation(s): 5 
Gene Names: nemRydhMb1649JW5874
UniProt
Find proteins for P67430 (Escherichia coli (strain K12))
Explore P67430 
Go to UniProtKB:  P67430
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP67430
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.205 
  • R-Value Observed: 0.207 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 67.438α = 90
b = 67.443β = 90
c = 213.864γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
PHASERphasing
PDB_EXTRACTdata extraction
HKL-2000data scaling
HKL-2000data reduction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-02-03
    Type: Initial release
  • Version 1.1: 2017-11-22
    Changes: Derived calculations, Refinement description
  • Version 1.2: 2023-09-27
    Changes: Data collection, Database references, Refinement description