4C5O

Flavin monooxygenase from Stenotrophomonas maltophilia. Q193R H194T mutant


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.295 
  • R-Value Work: 0.255 
  • R-Value Observed: 0.257 

wwPDB Validation 3D Report Full Report



Literature

Mutations of an Nad(P)H-Dependent Flavoprotein Monooxygenase that Influence Cofactor Promiscuity and Enantioselectivity.

Jensen, C.N.Ali, S.T.Allen, M.J.Grogan, G.

(2013) FEBS Open Bio 3: 473

  • DOI: 10.1016/j.fob.2013.09.008
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • The flavoprotein monooxygenase (FPMO) from Stenotrophomonas maltophilia (SMFMO, Uniprot: B2FLR2) catalyses the asymmetric oxidation of thioethers and is unusual amongst FPMOs in its ability to use the non-phosphorylated cofactor NADH, as well as NADP ...

    The flavoprotein monooxygenase (FPMO) from Stenotrophomonas maltophilia (SMFMO, Uniprot: B2FLR2) catalyses the asymmetric oxidation of thioethers and is unusual amongst FPMOs in its ability to use the non-phosphorylated cofactor NADH, as well as NADPH, for the reduction of the FAD coenzyme. In order to explore the basis for cofactor promiscuity, structure-guided mutation of two residues in the cofactor binding site, Gln193 and His194, in SMFMO were performed in an attempt to imitate the cofactor binding site of the NADPH-dependent FMO from Methylophaga aminisulfidivorans sp. SK1 (mFMO), in which structurally homologous residues Arg234 and Thr235 bind the NADPH 2'-ribose phosphate. Mutation of His194 to threonine proved most significant, with a switch in specificity from NADH to NADPH [(k cat/K m NADH)/k cat/K m NADPH) from 1.5:1 to 1:3.5, mostly as a result of a reduced K m for NADPH of approximately sevenfold in the His194Thr mutant. The structure of the Gln193Arg/His194Thr mutant revealed no substantial changes in the backbone of the enzyme or orientation of side chains resulting from mutation. Mutation of Phe52, in the vicinity of FAD, and which in mFMO is an asparagine thought to be responsible for flavin hydroperoxide stabilisation, is, in SMFMO, a determinant of enantioselectivity in sulfoxidation. Mutation of Phe52 to valine resulted in a mutant that transformed para-tolyl methyl sulfide into the (S)-sulfoxide with 32% e.e., compared to 25% (R)- for the wild type. These results shed further light both on the cofactor specificity of FPMOs, and their determinants of enantioselectivity, with a view to informing engineering studies of FPMOs in the future.


    Organizational Affiliation

    York Structural Biology Laboratory, Department of Chemistry, University of York, Heslington, York YO10 5DD, UK.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
FLAVIN MONOOXYGENASEA, B, C, D, E, F, G, H357Stenotrophomonas maltophiliaMutation(s): 2 
EC: 1.14.13.8
Find proteins for B2FRL2 (Stenotrophomonas maltophilia (strain K279a))
Explore B2FRL2 
Go to UniProtKB:  B2FRL2
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
FAD
Query on FAD

Download CCD File 
A, B, C, D, E, F, G, H
FLAVIN-ADENINE DINUCLEOTIDE
C27 H33 N9 O15 P2
VWWQXMAJTJZDQX-UYBVJOGSSA-N
 Ligand Interaction
SO4
Query on SO4

Download CCD File 
A, B, C, D, E, F, G, H
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.295 
  • R-Value Work: 0.255 
  • R-Value Observed: 0.257 
  • Space Group: P 32
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 170.538α = 90
b = 170.538β = 90
c = 101.762γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
SCALAdata scaling
MOLREPphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-02-19
    Type: Initial release