6SLS

Flavin-dependent tryptophan 6-halogenase Thal in complex with FAD

• PDB DOI: https://doi.org/10.2210/pdb6SLS/pdb

• Classification: FLAVOPROTEIN
• Organism(s): Streptomyces albogriseolus
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2019-08-20 Released: 2019-10-16 
• Deposition Author(s): Moritzer, A., Niemann, H.H.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.32 Å
• R-Value Free: 0.225 
• R-Value Work: 0.181 
• R-Value Observed: 0.183 

Literature

Binding of FAD and tryptophan to the tryptophan 6-halogenase Thal is negatively coupled.

Moritzer, A.C., Niemann, H.H.

(2019) Protein Sci 28: 2112-2118

• PubMed: 31589794 
• DOI: https://doi.org/10.1002/pro.3739
• Primary Citation of Related Structures:  
  6SLS, 6SLT


• PubMed Abstract: 
  

  Flavin-dependent halogenases require reduced flavin adenine dinucleotide (FADH ₂ ), O ₂ , and halide salts to halogenate their substrates. We describe the crystal structures of the tryptophan 6-halogenase Thal in complex with FAD or with both tryptophan and FAD. If tryptophan and FAD were soaked simultaneously, both ligands showed impaired binding and in some cases only the adenosine monophosphate or the adenosine moiety of FAD was resolved, suggesting that tryptophan binding increases the mobility mainly of the flavin mononucleotide moiety. This confirms a negative cooperativity between the binding of substrate and cofactor that was previously described for other tryptophan halogenases. Binding of substrate to tryptophan halogenases reduces the affinity for the oxidized cofactor FAD presumably to facilitate the regeneration of FADH ₂ by flavin reductases.

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Organizational Affiliation: 

Department of Chemistry, Bielefeld University, Bielefeld, Germany.

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PISA (software)

Biological Assembly Evidence: gel filtration

Macromolecule Content

• Total Structure Weight: 122.92 kDa 
• Atom Count: 8,624 
• Modelled Residue Count: 1,041 
• Deposited Residue Count: 1,068 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Tryptophan 6-halogenase	A, B	534	Streptomyces albogriseolus	Mutation(s): 0  Gene Names: thal, thdH
UniProt
Find proteins for A1E280 (Streptomyces albogriseolus) Explore A1E280  Go to UniProtKB:  A1E280

Small Molecules

Ligands 4 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
FAD (Subject of Investigation/LOI)	H [auth A], L [auth B]	FLAVIN-ADENINE DINUCLEOTIDE C27 H33 N9 O15 P2 VWWQXMAJTJZDQX-UYBVJOGSSA-N
PO4	F [auth A], G [auth A], I [auth B], J [auth B], K [auth B]	PHOSPHATE ION O4 P NBIIXXVUZAFLBC-UHFFFAOYSA-K
GOL	C [auth A], D [auth A], E [auth A]	GLYCEROL C3 H8 O3 PEDCQBHIVMGVHV-UHFFFAOYSA-N
K	M [auth B]	POTASSIUM ION K NPYPAHLBTDXSSS-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.32 Å
• R-Value Free: 0.225 
• R-Value Work: 0.181 
• R-Value Observed: 0.183 
• Space Group: P 6₄

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 138.56	α = 90
b = 138.56	β = 90
c = 142.05	γ = 120

Software Package:

Software Name	Purpose
REFMAC	refinement
PDB_EXTRACT	data extraction
XDS	data reduction
XSCALE	data scaling
PHASER	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2019-10-16 
Deposition Author(s): Moritzer, A., Niemann, H.H.

Revision History  

• Version 1.0: 2019-10-16
  Type: Initial release
  
• Version 1.1: 2019-10-30
  Changes: Data collection, Database references
• Version 1.2: 2019-11-27
  Changes: Database references
• Version 1.3: 2024-01-24
  Changes: Data collection, Database references, Refinement description