4LTD

Crystal structures of NADH:FMN oxidoreductase (EMOB) - apo form


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.19 Å
  • R-Value Free: 0.192 
  • R-Value Work: 0.169 
  • R-Value Observed: 0.171 

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This is version 1.1 of the entry. See complete history


Literature

Crystal structures of NADH:FMN oxidoreductase (EmoB) at different stages of catalysis.

Nissen, M.S.Youn, B.Knowles, B.D.Ballinger, J.W.Jun, S.Y.Belchik, S.M.Xun, L.Kang, C.

(2008) J Biol Chem 283: 28710-28720

  • DOI: https://doi.org/10.1074/jbc.M804535200
  • Primary Citation of Related Structures:  
    4LTD, 4LTM, 4LTN

  • PubMed Abstract: 

    EDTA has become a major organic pollutant in the environment because of its extreme usage and resistance to biodegradation. Recently, two critical enzymes, EDTA monooxygenase (EmoA) and NADH:FMN oxidoreductase (EmoB), belonging to the newly established two-component flavin-diffusible monooxygenase family, were identified in the EDTA degradation pathway in Mesorhizobium sp. BNC1. EmoA is an FMNH2-dependent enzyme that requires EmoB to provide FMNH2 for the conversion of EDTA to ethylenediaminediacetate. To understand the molecular basis of this FMN-mediated reaction, the crystal structures of the apo-form, FMN.FMN complex, and FMN.NADH complex of EmoB were determined at 2.5 angstroms resolution. The structure of EmoB is a homotetramer consisting of four alpha/beta-single-domain monomers of five parallel beta-strands flanked by five alpha-helices, which is quite different from those of other known two-component flavin-diffusible monooxygenase family members, such as PheA2 and HpaC, in terms of both tertiary and quaternary structures. For the first time, the crystal structures of both the FMN.FMN and FMN.NADH complexes of an NADH:FMN oxidoreductase were determined. Two stacked isoalloxazine rings and nicotinamide/isoalloxazine rings were at a proper distance for hydride transfer. The structures indicated a ping-pong reaction mechanism, which was confirmed by activity assays. Thus, the structural data offer detailed mechanistic information for hydride transfer between NADH to an enzyme-bound FMN and between the bound FMNH2 and a diffusible FMN.


  • Organizational Affiliation

    School of Molecular Biosciences, Washington State University, Pullman, Washington 99164-4660, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
NADH-dependent FMN reductase197EDTA-degrading bacterium BNC1Mutation(s): 0 
Gene Names: emoB
EC: 1.5.1.42
UniProt
Find proteins for Q9F9T2 (EDTA-degrading bacterium BNC1)
Explore Q9F9T2 
Go to UniProtKB:  Q9F9T2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9F9T2
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.19 Å
  • R-Value Free: 0.192 
  • R-Value Work: 0.169 
  • R-Value Observed: 0.171 
  • Space Group: P 64 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 100.925α = 90
b = 100.925β = 90
c = 129.61γ = 120
Software Package:
Software NamePurpose
ADSCdata collection
X-PLORmodel building
PHENIXrefinement
CrystalCleardata reduction
CrystalCleardata scaling
X-PLORphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-08-07
    Type: Initial release
  • Version 1.1: 2024-11-20
    Changes: Data collection, Database references, Derived calculations, Structure summary