Crystal Structure of CbAR mutant (H162F) in complex with NADP+ and halogenated aryl ketone

Experimental Data Snapshot

  • Resolution: 2.90 Å
  • R-Value Free: 0.289 
  • R-Value Work: 0.202 
  • R-Value Observed: 0.206 

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Structural analysis of an anthrol reductase inspires enantioselective synthesis of enantiopure hydroxycycloketones and beta-halohydrins.

Hou, X.Xu, H.Yuan, Z.Deng, Z.Fu, K.Gao, Y.Liu, C.Zhang, Y.Rao, Y.

(2023) Nat Commun 14: 353-353

  • DOI: https://doi.org/10.1038/s41467-023-36064-4
  • Primary Citation of Related Structures:  
    7YB1, 7YB2, 8HFJ, 8HFK

  • PubMed Abstract: 

    Asymmetric reduction of prochiral ketones, particularly, reductive desymmetrization of 2,2-disubstituted prochiral 1,3-cyclodiketones to produce enantiopure chiral alcohols is challenging. Herein, an anthrol reductase CbAR with the ability to accommodate diverse bulky substrates, like emodin, for asymmetric reduction is identified. We firstly solve crystal structures of CbAR and CbAR-Emodin complex. It reveals that Tyr210 is critical for emodin recognition and binding, as it forms a hydrogen-bond interaction with His162 and π-π stacking interactions with emodin. This ensures the correct orientation for the stereoselectivity. Then, through structure-guided engineering, variant CbAR-H162F can convert various 2,2-disubstituted 1,3-cyclodiketones and α-haloacetophenones to optically pure (2S, 3S)-ketols and (R)-β-halohydrins, respectively. More importantly, their stereoselectivity mechanisms are also well explained by the respective crystal structures of CbAR-H162F-substrate complex. Therefore, this study demonstrates that an in-depth understanding of catalytic mechanism is valuable for exploiting the promiscuity of anthrol reductases to prepare diverse enantiopure chiral alcohols.

  • Organizational Affiliation

    Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, 214122, P. R. China.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Versicolorin reductase
A, B, C, D
279Cercospora sp. JNU001Mutation(s): 1 
Gene Names: CB0940_02504
Find proteins for A0A2G5I2X5 (Cercospora beticola)
Explore A0A2G5I2X5 
Go to UniProtKB:  A0A2G5I2X5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A2G5I2X5
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.90 Å
  • R-Value Free: 0.289 
  • R-Value Work: 0.202 
  • R-Value Observed: 0.206 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 124.867α = 90
b = 124.867β = 90
c = 133.195γ = 90
Software Package:
Software NamePurpose
SAINTdata scaling
SAINTdata reduction

Structure Validation

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Ligand Structure Quality Assessment 

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Other privateChina2021YFC2102700
Other privateChinaBK20202002
Other privateChinaKYCX20_1812
Other privateChinaKYCX20_1816

Revision History  (Full details and data files)

  • Version 1.0: 2023-06-07
    Type: Initial release
  • Version 1.1: 2023-11-08
    Changes: Data collection, Source and taxonomy