8TTI

Trp-6-Halogenase BorH complexed with FAD and Trp


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.98 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.229 
  • R-Value Observed: 0.229 

Starting Model: experimental
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Literature

Crystallographic and thermodynamic evidence of negative cooperativity of flavin and tryptophan binding in the flavin-dependent halogenases AbeH and BorH.

Ashaduzzaman, M.Lingkon, K.De Silva, A.J.Bellizzi, J.J.

(2023) bioRxiv 

  • DOI: https://doi.org/10.1101/2023.08.22.554356
  • Primary Citation of Related Structures:  
    8FOV, 8FOX, 8TTI, 8TTJ, 8TTK

  • PubMed Abstract: 

    The flavin-dependent halogenase AbeH produces 5-chlorotryptophan in the biosynthetic pathway of the chlorinated bisindole alkaloid BE-54017. We report that in vitro , AbeH (assisted by the flavin reductase AbeF) can chlorinate and brominate tryptophan as well as other indole derivatives and substrates with phenyl and quinoline groups. We solved the X-ray crystal structures of AbeH alone and complexed with FAD, as well as crystal structures of the tryptophan-6-halogenase BorH alone, in complex with 6-chlorotryptophan, and in complex with FAD and tryptophan. Partitioning of FAD and tryptophan into different chains of BorH and failure to incorporate tryptophan into AbeH/FAD crystals suggested that flavin and tryptophan binding are negatively coupled in both proteins. ITC and fluorescence quenching experiments confirmed the ability of both AbeH and BorH to form binary complexes with FAD or tryptophan and the inability of tryptophan to bind to AbeH/FAD or BorH/FAD complexes. FAD could not bind to BorH/tryptophan complexes, but FAD appears to displace tryptophan from AbeH/tryptophan complexes in an endothermic entropically-driven process.


  • Organizational Affiliation

    Department of Chemistry and Biochemistry, The University of Toledo, Toledo OH 43606.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Tryptophan 6-halogenase
A, B, C, D
529uncultured bacteriumMutation(s): 0 
Gene Names: borH
UniProt
Find proteins for M9QSI0 (uncultured bacterium)
Explore M9QSI0 
Go to UniProtKB:  M9QSI0
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupM9QSI0
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
FAD (Subject of Investigation/LOI)
Query on FAD

Download Ideal Coordinates CCD File 
P [auth C],
R [auth D]
FLAVIN-ADENINE DINUCLEOTIDE
C27 H33 N9 O15 P2
VWWQXMAJTJZDQX-UYBVJOGSSA-N
TRP (Subject of Investigation/LOI)
Query on TRP

Download Ideal Coordinates CCD File 
E [auth A],
J [auth B]
TRYPTOPHAN
C11 H12 N2 O2
QIVBCDIJIAJPQS-VIFPVBQESA-N
SO4
Query on SO4

Download Ideal Coordinates CCD File 
F [auth A]
G [auth A]
H [auth A]
I [auth A]
K [auth B]
F [auth A],
G [auth A],
H [auth A],
I [auth A],
K [auth B],
L [auth B],
M [auth B],
N [auth B],
O [auth B],
Q [auth C],
S [auth D],
T [auth D],
U [auth D]
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.98 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.229 
  • R-Value Observed: 0.229 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 73.68α = 90
b = 157.41β = 104.06
c = 112.83γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
MOSFLMdata reduction
Aimlessdata scaling
PHASERphasing
PDB_EXTRACTdata extraction

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United States1R15GM144877

Revision History  (Full details and data files)

  • Version 1.0: 2023-08-30
    Type: Initial release
  • Version 1.1: 2023-09-13
    Changes: Database references