4D02

The crystallographic structure of Flavorubredoxin from Escherichia coli


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Work: 0.141 
  • R-Value Observed: 0.141 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Structure of Escherichia Coli Flavodiiron Nitric Oxide Reductase.

Romao, C.V.Vicente, J.B.Borges, P.T.Victor, B.L.Lamosa, P.Silva, E.Bandeiras, T.M.Soares, C.M.Carrondo, M.A.Turner, D.Teixeira, M.Frazao, C.

(2016) J Mol Biol 428: 4686

  • DOI: 10.1016/j.jmb.2016.10.008
  • Primary Citation of Related Structures:  
    4D02, 5LLD, 5LMC

  • PubMed Abstract: 
  • Flavodiiron proteins (FDPs) are present in organisms from all domains of life and have been described so far to be involved in the detoxification of oxygen or nitric oxide (NO), acting as O 2 and/or NO reductases. The Escherichia coli FDP, named flavorubredoxin (FlRd), is the most extensively studied FDP ...

    Flavodiiron proteins (FDPs) are present in organisms from all domains of life and have been described so far to be involved in the detoxification of oxygen or nitric oxide (NO), acting as O 2 and/or NO reductases. The Escherichia coli FDP, named flavorubredoxin (FlRd), is the most extensively studied FDP. Biochemical and in vivo studies revealed that FlRd is involved in NO detoxification as part of the bacterial defense mechanisms against reactive nitrogen species. E. coli FlRd has a clear preference for NO as a substrate in vitro, exhibiting a very low reactivity toward O 2 . To contribute to the understanding of the structural features defining this substrate selectivity, we determined the crystallographic structure of E. coli FlRd, both in the isolated and reduced states. The overall tetrameric structure revealed a highly conserved flavodiiron core domain, with a metallo-β-lactamase-like domain containing a diiron center, and a flavodoxin domain with a flavin mononucleotide cofactor. The metal center in the oxidized state has a μ-hydroxo bridge coordinating the two irons, while in the reduced state, this moiety is not detected. Since only the flavodiiron domain was observed in these crystal structures, the structure of the rubredoxin domain was determined by NMR. Tunnels for the substrates were identified, and through molecular dynamics simulations, no differences for O 2 or NO permeation were found. The present data represent the first structure for a NO-selective FDP.


    Organizational Affiliation

    Instituto de Tecnologia Química e Biológica António Xavier, ITQB NOVA, Av. da República, 2780-157 Oeiras, Portugal. Electronic address: frazao@itqb.unl.pt.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ANAEROBIC NITRIC OXIDE REDUCTASE FLAVORUBREDOXIN A479Escherichia coli K-12Mutation(s): 0 
Gene Names: norVflrDygaIygaJygaKb2710JW2680
Find proteins for Q46877 (Escherichia coli (strain K12))
Explore Q46877 
Go to UniProtKB:  Q46877
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Work: 0.141 
  • R-Value Observed: 0.141 
  • Space Group: P 6 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 149.529α = 90
b = 149.529β = 90
c = 94.498γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XDSdata scaling
SHELXCDphasing
SHELXEmodel building

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-09-03
    Type: Initial release
  • Version 1.1: 2014-10-22
    Changes: Database references
  • Version 1.2: 2017-02-08
    Changes: Database references
  • Version 1.3: 2019-05-08
    Changes: Data collection, Experimental preparation, Other