4LU6

Thermostabilized RebH

• PDB DOI: https://doi.org/10.2210/pdb4LU6/pdb

• Classification: OXIDOREDUCTASE
• Organism(s): Lentzea aerocolonigenes
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 2013-07-24 Released: 2014-06-11 
• Deposition Author(s): Poor, C.B., Lewis, J.C.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.05 Å
• R-Value Free: 0.237 
• R-Value Work: 0.178 
• R-Value Observed: 0.181 

Literature

Improving the Stability and Catalyst Lifetime of the Halogenase RebH By Directed Evolution.

Poor, C.B., Andorfer, M.C., Lewis, J.C.

(2014) Chembiochem 15: 1286-1289

• PubMed: 24849696 
• DOI: https://doi.org/10.1002/cbic.201300780
• Primary Citation of Related Structures:  
  4LU6


• PubMed Abstract: 
  

  We previously reported that the halogenase RebH catalyzes selective halogenation of several heterocycles and carbocycles, but product yields were limited by enzyme instability. Here, we use directed evolution to engineer an RebH variant, 3-LR, with a Topt over 5 °C higher than that of wild-type, and 3-LSR, with a Tm 18 °C higher than that of wild-type. These enzymes provided significantly improved conversion (up to fourfold) for halogenation of tryptophan and several non-natural substrates. This initial evolution of RebH not only provides improved enzymes for immediate synthetic applications, but also establishes a robust protocol for further halogenase evolution.

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Organizational Affiliation: 

Department of Chemistry, University of Chicago, 5735 S. Ellis Ave., Chicago, IL 60637 (USA).

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)

Macromolecule Content

• Total Structure Weight: 125.11 kDa 
• Atom Count: 8,473 
• Modelled Residue Count: 1,054 
• Deposited Residue Count: 1,100 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Flavin-dependent tryptophan halogenase RebH	A, B	550	Lentzea aerocolonigenes	Mutation(s): 8  Gene Names: rebH, rbmJ EC: 1.14.14.7
UniProt
Find proteins for Q8KHZ8 (Lentzea aerocolonigenes) Explore Q8KHZ8  Go to UniProtKB:  Q8KHZ8

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
PO4	C [auth A], D [auth B]	PHOSPHATE ION O4 P NBIIXXVUZAFLBC-UHFFFAOYSA-K

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.05 Å
• R-Value Free: 0.237 
• R-Value Work: 0.178 
• R-Value Observed: 0.181 
• Space Group: P 6₂

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 115.038	α = 90
b = 115.038	β = 90
c = 229.573	γ = 120

Software Package:

Software Name	Purpose
ADSC	data collection
PHASER	phasing
PHENIX	refinement
DENZO	data reduction
SCALEPACK	data scaling

Structure Validation

Entry History 

Deposition Data

• Released Date: 2014-06-11 
Deposition Author(s): Poor, C.B., Lewis, J.C.

Revision History  

• Version 1.0: 2014-06-11
  Type: Initial release
  
• Version 1.1: 2014-07-02
  Changes: Database references
• Version 1.2: 2024-02-28
  Changes: Data collection, Database references, Derived calculations