4IV9

Structure of the Flavoprotein Tryptophan-2-Monooxygenase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.951 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.187 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structure of the flavoprotein tryptophan 2-monooxygenase, a key enzyme in the formation of galls in plants.

Gaweska, H.M.Taylor, A.B.Hart, P.J.Fitzpatrick, P.F.

(2013) Biochemistry 52: 2620-2626

  • DOI: 10.1021/bi4001563

  • PubMed Abstract: 
  • The flavoprotein tryptophan 2-monooxygenase catalyzes the oxidative decarboxylation of tryptophan to yield indole-3-acetamide. This is the initial step in the biosynthesis of the plant growth hormone indole-acetic acid by bacterial pathogens that cau ...

    The flavoprotein tryptophan 2-monooxygenase catalyzes the oxidative decarboxylation of tryptophan to yield indole-3-acetamide. This is the initial step in the biosynthesis of the plant growth hormone indole-acetic acid by bacterial pathogens that cause crown gall and related diseases. The structure of the enzyme from Pseudomonas savastanoi has been determined by X-ray diffraction methods to a resolution of 1.95 Å. The overall structure of the protein shows that it has the same fold as members of the monoamine oxidase family of flavoproteins, with the greatest similarities to the l-amino acid oxidases. The location of bound indole-3-acetamide in the active site allows identification of residues responsible for substrate binding and specificity. Two residues in the enzyme are conserved in all members of the monoamine oxidase family, Lys365 and Trp466. The K365M mutation decreases the kcat and kcat/KTrp values by 60000- and 2 million-fold, respectively. The deuterium kinetic isotope effect increases to 3.2, consistent with carbon-hydrogen bond cleavage becoming rate-limiting in the mutant enzyme. The W466F mutation decreases the kcat value <2-fold and the kcat/KTrp value only 5-fold, while the W466M mutation results in an enzyme lacking flavin and detectable activity. This is consistent with a role for Trp466 in maintaining the structure of the flavin-binding site in the more conserved FAD domain.


    Organizational Affiliation

    Department of Biochemistry, University of Texas Health Science Center, San Antonio, Texas 78229, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Tryptophan 2-monooxygenase
A, B
557Pseudomonas savastanoiGene Names: iaaM
EC: 1.13.12.3
Find proteins for P06617 (Pseudomonas savastanoi)
Go to UniProtKB:  P06617
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PO4
Query on PO4

Download SDF File 
Download CCD File 
A
PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
 Ligand Interaction
FAD
Query on FAD

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Download CCD File 
A, B
FLAVIN-ADENINE DINUCLEOTIDE
C27 H33 N9 O15 P2
VWWQXMAJTJZDQX-UYBVJOGSSA-N
 Ligand Interaction
EDO
Query on EDO

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Download CCD File 
A
1,2-ETHANEDIOL
ETHYLENE GLYCOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
TSR
Query on TSR

Download SDF File 
Download CCD File 
A, B
2-(1H-INDOL-3-YL)ACETAMIDE
C10 H10 N2 O
ZOAMBXDOGPRZLP-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.951 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.187 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 111.135α = 90.00
b = 122.207β = 90.00
c = 76.627γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data scaling
PHASERphasing
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-04-10
    Type: Initial release
  • Version 1.1: 2013-05-01
    Type: Database references