3FMW

The crystal structure of MtmOIV, a Baeyer-Villiger monooxygenase from the mithramycin biosynthetic pathway in Streptomyces argillaceus.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.89 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.235 
  • R-Value Observed: 0.237 

Starting Model: experimental
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This is version 1.3 of the entry. See complete history


Literature

Crystal structure of Baeyer-Villiger monooxygenase MtmOIV, the key enzyme of the mithramycin biosynthetic pathway .

Beam, M.P.Bosserman, M.A.Noinaj, N.Wehenkel, M.Rohr, J.

(2009) Biochemistry 48: 4476-4487

  • DOI: https://doi.org/10.1021/bi8023509
  • Primary Citation of Related Structures:  
    3FMW

  • PubMed Abstract: 

    Baeyer-Villiger monooxygenases (BVMOs), mostly flavoproteins, were shown to be powerful biocatalysts for synthetic organic chemistry applications and were also suggested to play key roles for the biosyntheses of various natural products. Here we present the three-dimensional structure of MtmOIV, a 56 kDa homodimeric FAD- and NADPH-dependent monooxygenase, which catalyzes the key frame-modifying step of the mithramycin biosynthetic pathway and currently the only BVMO proven to react with its natural substrate via a Baeyer-Villiger reaction. MtmOIV's structure was determined by X-ray crystallography using molecular replacement to a resolution of 2.9 A. MtmOIV cleaves a C-C bond, essential for the conversion of the biologically inactive precursor, premithramycin B, into the active drug mithramycin. The MtmOIV structure combined with substrate docking calculations and site-directed mutagenesis experiments identifies several residues that participate in cofactor and substrate binding. Future experimentation aimed at broadening the substrate specificity of the enzyme could facilitate the generation of chemically diverse mithramycin analogues through combinatorial biosynthesis.


  • Organizational Affiliation

    Department of Pharmaceutical Sciences, College of Pharmacy, and Kentucky Center for Structural Biology, University of Kentucky, Lexington, Kentucky 40536, USA.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Oxygenase
A, B, C
570Streptomyces argillaceusMutation(s): 0 
Gene Names: mtmOIV
UniProt
Find proteins for Q194P4 (Streptomyces argillaceus)
Explore Q194P4 
Go to UniProtKB:  Q194P4
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ194P4
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.89 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.235 
  • R-Value Observed: 0.237 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 145.265α = 90
b = 114.437β = 103.03
c = 138.563γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
PHASERphasing
RESOLVEphasing
PHENIXrefinement
PDB_EXTRACTdata extraction
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-05-05
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2017-11-01
    Changes: Refinement description
  • Version 1.3: 2023-09-06
    Changes: Data collection, Database references, Derived calculations, Refinement description