3H96

Msmeg_3358 F420 Reductase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.185 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Identification and characterization of two families of F420 H2-dependent reductases from Mycobacteria that catalyse aflatoxin degradation.

Taylor, M.C.Jackson, C.J.Tattersall, D.B.French, N.Peat, T.S.Newman, J.Briggs, L.J.Lapalikar, G.V.Campbell, P.M.Scott, C.Russell, R.J.Oakeshott, J.G.

(2010) Mol.Microbiol. 78: 561-575

  • DOI: 10.1111/j.1365-2958.2010.07356.x

  • PubMed Abstract: 
  • Aflatoxins are polyaromatic mycotoxins that contaminate a range of food crops as a result of fungal growth and contribute to serious health problems in the developing world because of their toxicity and mutagenicity. Although relatively resistant to ...

    Aflatoxins are polyaromatic mycotoxins that contaminate a range of food crops as a result of fungal growth and contribute to serious health problems in the developing world because of their toxicity and mutagenicity. Although relatively resistant to biotic degradation, aflatoxins can be metabolized by certain species of Actinomycetales. However, the enzymatic basis for their breakdown has not been reported until now. We have identified nine Mycobacterium smegmatis enzymes that utilize the deazaflavin cofactor F(420) H(2) to catalyse the reduction of the α,β-unsaturated ester moiety of aflatoxins, activating the molecules for spontaneous hydrolysis and detoxification. These enzymes belong to two previously uncharacterized F(420) H(2) dependent reductase (FDR-A and -B) families that are distantly related to the flavin mononucleotide (FMN) dependent pyridoxamine 5'-phosphate oxidases (PNPOxs). We have solved crystal structures of an enzyme from each FDR family and show that they, like the PNPOxs, adopt a split barrel protein fold, although the FDRs also possess an extended and highly charged F(420) H(2) binding groove. A general role for these enzymes in xenobiotic metabolism is discussed, including the observation that the nitro-reductase Rv3547 from Mycobacterium tuberculosis that is responsible for the activation of bicyclic nitroimidazole prodrugs belongs to the FDR-A family.


    Organizational Affiliation

    CSIRO Ecosystem Sciences, GPO Box 1700, Canberra, ACT 2601, Australia. m.taylor@csiro.au




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
F420-H2 Dependent Reductase A
A, B, C, D
143Mycolicibacterium smegmatis (strain ATCC 700084 / mc(2)155)Mutation(s): 0 
Find proteins for A0QXM5 (Mycolicibacterium smegmatis (strain ATCC 700084 / mc(2)155))
Go to UniProtKB:  A0QXM5
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
EDO
Query on EDO

Download SDF File 
Download CCD File 
B
1,2-ETHANEDIOL
ETHYLENE GLYCOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A, B, C, D
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.185 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 59.650α = 90.00
b = 71.150β = 90.39
c = 63.840γ = 90.00
Software Package:
Software NamePurpose
ADSCdata collection
REFMACrefinement
MOSFLMdata reduction
SHELXSphasing
SCALAdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-04-14
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance