Crystal structure of the Chloramphenicol-inactivating oxidoreductase from Novosphingobium sp

Experimental Data Snapshot

  • Resolution: 2.10 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.207 
  • R-Value Observed: 0.208 

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Bacterial Dehydrogenases Facilitate Oxidative Inactivation and Bioremediation of Chloramphenicol.

Zhang, L.Toplak, M.Saleem-Batcha, R.Hoing, L.Jakob, R.Jehmlich, N.von Bergen, M.Maier, T.Teufel, R.

(2023) Chembiochem 24: e202200632-e202200632

  • DOI: https://doi.org/10.1002/cbic.202200632
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Antimicrobial resistance represents a major threat to human health and knowledge of the underlying mechanisms is therefore vital. Here, we report the discovery and characterization of oxidoreductases that inactivate the broad-spectrum antibiotic chloramphenicol via dual oxidation of the C3-hydroxyl group. Accordingly, chloramphenicol oxidation either depends on standalone glucose-methanol-choline (GMC)-type flavoenzymes, or on additional aldehyde dehydrogenases that boost overall turnover. These enzymes also enable the inactivation of the chloramphenicol analogues thiamphenicol and azidamfenicol, but not of the C3-fluorinated florfenicol. Notably, distinct isofunctional enzymes can be found in Gram-positive (e. g., Streptomyces sp.) and Gram-negative (e. g., Sphingobium sp.) bacteria, which presumably evolved their selectivity for chloramphenicol independently based on phylogenetic analyses. Mechanistic and structural studies provide further insights into the catalytic mechanisms of these biotechnologically interesting enzymes, which, in sum, are both a curse and a blessing by contributing to the spread of antibiotic resistance as well as to the bioremediation of chloramphenicol.

  • Organizational Affiliation

    Faculty of Biology, University of Freiburg, Schänzlestrasse 1, 79104, Freiburg, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Chloramphenicol-inactivating oxidoreductase542Novosphingobium sp. B 225Mutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
FAD (Subject of Investigation/LOI)
Query on FAD

Download Ideal Coordinates CCD File 
C27 H33 N9 O15 P2
Experimental Data & Validation

Experimental Data

  • Resolution: 2.10 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.207 
  • R-Value Observed: 0.208 
  • Space Group: I 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 74.623α = 90
b = 43.806β = 91.06
c = 164.698γ = 90
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
XDSdata reduction
Aimlessdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
German Research Foundation (DFG)GermanyTE 931/3-1
German Research Foundation (DFG)GermanyTE 931/4-1

Revision History  (Full details and data files)

  • Version 1.0: 2022-11-16
    Type: Initial release
  • Version 1.1: 2022-11-23
    Changes: Database references
  • Version 1.2: 2022-11-30
    Changes: Database references
  • Version 1.3: 2022-12-07
    Changes: Database references
  • Version 1.4: 2022-12-14
    Changes: Database references
  • Version 1.5: 2023-02-01
    Changes: Database references