Crystal structure of monooxygenase RutA complexed with 4-Thiouracil.

Experimental Data Snapshot

  • Resolution: 2.00 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.203 

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This is version 1.2 of the entry. See complete history


Aminoperoxide adducts expand the catalytic repertoire of flavin monooxygenases.

Matthews, A.Saleem-Batcha, R.Sanders, J.N.Stull, F.Houk, K.N.Teufel, R.

(2020) Nat Chem Biol 16: 556-563

  • DOI: https://doi.org/10.1038/s41589-020-0476-2
  • Primary Citation of Related Structures:  
    6SGG, 6SGL, 6SGM, 6SGN, 6TEE, 6TEF, 6TEG

  • PubMed Abstract: 

    One of the hallmark reactions catalyzed by flavin-dependent enzymes is the incorporation of an oxygen atom derived from dioxygen into organic substrates. For many decades, these flavin monooxygenases were assumed to use exclusively the flavin-C4a-(hydro)peroxide as their oxygen-transferring intermediate. We demonstrate that flavoenzymes may instead employ a flavin-N5-peroxide as a soft α-nucleophile for catalysis, which enables chemistry not accessible to canonical monooxygenases. This includes, for example, the redox-neutral cleavage of carbon-hetero bonds or the dehalogenation of inert environmental pollutants via atypical oxygenations. We furthermore identify a shared structural motif for dioxygen activation and N5-functionalization, suggesting a conserved pathway that may be operative in numerous characterized and uncharacterized flavoenzymes from diverse organisms. Our findings show that overlooked flavin-N5-oxygen adducts are more widespread and may facilitate versatile chemistry, thus upending the notion that flavin monooxygenases exclusively function as nature's equivalents to organic peroxides in synthetic chemistry.

  • Organizational Affiliation

    Department of Chemistry and Biochemistry, University of California, Los Angeles, CA, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Pyrimidine monooxygenase RutAA [auth AAA]363Escherichia coli K-12Mutation(s): 0 
Gene Names: rutAycdMb1012JW0997
Find proteins for P75898 (Escherichia coli (strain K12))
Explore P75898 
Go to UniProtKB:  P75898
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP75898
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.00 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.203 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 87.567α = 90
b = 87.567β = 90
c = 95.999γ = 120
Software Package:
Software NamePurpose
XDSdata reduction
SCALAdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
German Research FoundationGermanyTE 931/2-1
German Research FoundationGermany235777276/GRK1976

Revision History  (Full details and data files)

  • Version 1.0: 2020-02-05
    Type: Initial release
  • Version 1.1: 2020-05-06
    Changes: Database references
  • Version 1.2: 2024-01-24
    Changes: Data collection, Database references, Refinement description