6LQL

Complex structure of CHAO with product from Erythrobacteraceae bacterium


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.188 
  • R-Value Work: 0.169 
  • R-Value Observed: 0.170 

wwPDB Validation   3D Report Full Report


Ligand Structure Quality Assessment 


This is version 1.2 of the entry. See complete history


Literature

Asymmetric Synthesis of a Key Dextromethorphan Intermediate and Its Analogues Enabled by a New Cyclohexylamine Oxidase: Enzyme Discovery, Reaction Development, and Mechanistic Insight.

Wu, X.Huang, Z.Wang, Z.Li, Z.Wang, J.Lin, J.Chen, F.

(2020) J Org Chem 85: 5598-5614

  • DOI: https://doi.org/10.1021/acs.joc.0c00469
  • Primary Citation of Related Structures:  
    6LQC, 6LQL

  • PubMed Abstract: 

    ( S )-1-(4-Methoxybenzyl)-1,2,3,4,5,6,7,8-octahydroisoquinoline [( S )-1-(4-methoxybenzyl)-OHIQ, ( S )- 1a ] is a key synthetic intermediate in the industrial production of dextromethorphan, one of the most widely used over-the-counter antitussives. We report here that a new cyclohexylamine oxidase discovered by genome mining, named CHAO CCH12-C2 , was able to completely deracemize 100 mM 1a under Turner's deracemization conditions to afford ( S )- 1a in 80% isolated yield and 99% ee at a semipreparative scale (0.4 mmol). When this biocatalytic reaction was scaled up to a gram scale (5.8 mmol), without reaction optimization ( S )- 1a was still isolated in 67% yield and 96% ee. The relatively higher k cat determined for CHAO CCH12-C2 was rationalized as one major factor rendering this enzyme capable of oxidizing 1a effectively at elevated substrate concentrations. Protein sequence alignment, analysis of our co-crystal structure of CHAO CCH12-C2 complexed with the product 1-(4-methoxybenzyl)-3,4,5,6,7,8-hexahydroisoquinoline [1-(4-methoxybenzyl)-HHIQ, 2a ], and the structure-guided mutagenesis study together indicated L295 is one of the critical residues for this efficient enzymatic oxidation process and supported the presence of two cavities as well as a catalytically important "aromatic cage" formed by F342, Y433, and FAD. The synthetic applicability of CHAO CCH12-C2 was further underscored by the stereoselective synthesis of various enantioenriched 1-benzyl-OHIQ derivatives of potential pharmaceutical importance at a semipreparative scale.


  • Organizational Affiliation

    College of Chemical Engineering, Fuzhou University, Fuzhou 350116, P. R. China.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Amine oxidase453Erythrobacteraceae bacterium CCH12-C2Mutation(s): 0 
Gene Names: CCH12-C2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
FAD
Query on FAD

Download Ideal Coordinates CCD File 
B [auth A]FLAVIN-ADENINE DINUCLEOTIDE
C27 H33 N9 O15 P2
VWWQXMAJTJZDQX-UYBVJOGSSA-N
F0C (Subject of Investigation/LOI)
Query on F0C

Download Ideal Coordinates CCD File 
C [auth A]1-[(4-methoxyphenyl)methyl]-3,4,5,6,7,8-hexahydroisoquinoline
C17 H21 N O
IYZRINJHKVQAQC-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.188 
  • R-Value Work: 0.169 
  • R-Value Observed: 0.170 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 83.205α = 90
b = 83.205β = 90
c = 176.643γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-3000data reduction
HKL-3000data scaling
MOLREPphasing

Structure Validation

View Full Validation Report



Ligand Structure Quality Assessment 


Entry History 

Deposition Data

  • Released Date: 2020-06-03 
  • Deposition Author(s): Huang, Z.D.

Revision History  (Full details and data files)

  • Version 1.0: 2020-06-03
    Type: Initial release
  • Version 1.1: 2020-07-22
    Changes: Source and taxonomy, Structure summary
  • Version 1.2: 2023-11-29
    Changes: Data collection, Database references, Refinement description