2,4,6-Trichlorophenol 4-monooxygenase

Experimental Data Snapshot

  • Resolution: 2.50 Å
  • R-Value Free: 0.224 
  • R-Value Work: 0.174 
  • R-Value Observed: 0.175 

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Structural and Catalytic Differences between Two FADH(2)-Dependent Monooxygenases: 2,4,5-TCP 4-Monooxygenase (TftD) from Burkholderia cepacia AC1100 and 2,4,6-TCP 4-Monooxygenase (TcpA) from Cupriavidus necator JMP134.

Hayes, R.P.Webb, B.N.Subramanian, A.K.Nissen, M.Popchock, A.Xun, L.Kang, C.

(2012) Int J Mol Sci 13: 9769-9784

  • DOI: https://doi.org/10.3390/ijms13089769
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    2,4,5-TCP 4-monooxygenase (TftD) and 2,4,6-TCP 4-monooxygenase (TcpA) have been discovered in the biodegradation of 2,4,5-trichlorophenol (2,4,5-TCP) and 2,4,6-trichlorophenol (2,4,6-TCP). TcpA and TftD belong to the reduced flavin adenine dinucleotide (FADH(2))-dependent monooxygenases and both use 2,4,6-TCP as a substrate; however, the two enzymes produce different end products. TftD catalyzes a typical monooxygenase reaction, while TcpA catalyzes a typical monooxygenase reaction followed by a hydrolytic dechlorination. We have previously reported the 3D structure of TftD and confirmed the catalytic residue, His289. Here we have determined the crystal structure of TcpA and investigated the apparent differences in specificity and catalysis between these two closely related monooxygenases through structural comparison. Our computational docking results suggest that Ala293 in TcpA (Ile292 in TftD) is possibly responsible for the differences in substrate specificity between the two monooxygenases. We have also identified that Arg101 in TcpA could provide inductive effects/charge stabilization during hydrolytic dechlorination. The collective information provides a fundamental understanding of the catalytic reaction mechanism and the parameters for substrate specificity. The information may provide guidance for designing bioremediation strategies for polychlorophenols, a major group of environmental pollutants.

  • Organizational Affiliation

    Department of Chemistry, Washington State University, Pullman, WA 99164, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
2,4,6-Trichlorophenol 4-monooxygenase
A, B, C, D
517Cupriavidus pinatubonensis JMP134Mutation(s): 0 
Gene Names: Reut_A1585TcpA
Find proteins for Q471I2 (Cupriavidus pinatubonensis (strain JMP 134 / LMG 1197))
Explore Q471I2 
Go to UniProtKB:  Q471I2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ471I2
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.50 Å
  • R-Value Free: 0.224 
  • R-Value Work: 0.174 
  • R-Value Observed: 0.175 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 107.072α = 90
b = 180.05β = 97.87
c = 110.197γ = 90
Software Package:
Software NamePurpose
BOSdata collection
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-09-19
    Type: Initial release
  • Version 1.1: 2023-09-13
    Changes: Data collection, Database references, Refinement description