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 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.1 of the entry. See complete history


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: https://doi.org/10.1016/j.fob.2013.09.008
  • Primary Citation of Related Structures:  
    4C5O

  • 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 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:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
FLAVIN MONOOXYGENASE
A, B, C, D, E
A, B, C, D, E, F, G, H
357Stenotrophomonas maltophiliaMutation(s): 2 
EC: 1.14.13.8
UniProt
Find proteins for B2FRL2 (Stenotrophomonas maltophilia (strain K279a))
Explore B2FRL2 
Go to UniProtKB:  B2FRL2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupB2FRL2
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
FAD
Query on FAD

Download Ideal Coordinates CCD File 
EA [auth E]
I [auth A]
IA [auth F]
M [auth B]
NA [auth G]
EA [auth E],
I [auth A],
IA [auth F],
M [auth B],
NA [auth G],
R [auth C],
SA [auth H],
X [auth D]
FLAVIN-ADENINE DINUCLEOTIDE
C27 H33 N9 O15 P2
VWWQXMAJTJZDQX-UYBVJOGSSA-N
SO4
Query on SO4

Download Ideal Coordinates CCD File 
AA [auth D]
BA [auth D]
CA [auth D]
DA [auth D]
FA [auth E]
AA [auth D],
BA [auth D],
CA [auth D],
DA [auth D],
FA [auth E],
GA [auth E],
HA [auth E],
J [auth A],
JA [auth F],
K [auth A],
KA [auth F],
L [auth A],
LA [auth F],
MA [auth F],
N [auth B],
O [auth B],
OA [auth G],
P [auth B],
PA [auth G],
Q [auth B],
QA [auth G],
RA [auth G],
S [auth C],
T [auth C],
TA [auth H],
U [auth C],
UA [auth H],
V [auth C],
VA [auth H],
W [auth C],
WA [auth H],
Y [auth D],
Z [auth D]
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
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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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-02-19
    Type: Initial release
  • Version 1.1: 2023-12-20
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description