Identification of the functions of unusual cytochrome p450-like monooxygenases involved in microbial secondary metablism

Experimental Data Snapshot

  • Resolution: 2.00 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.222 
  • R-Value Observed: 0.223 

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Riboflavin Is Directly Involved in the N-Dealkylation Catalyzed by Bacterial Cytochrome P450 Monooxygenases.

Zhang, C.Lu, M.Lin, L.Huang, Z.Zhang, R.Wu, X.Chen, Y.

(2020) Chembiochem 

  • DOI: https://doi.org/10.1002/cbic.202000071
  • Primary Citation of Related Structures:  
    5Z9I, 5Z9J

  • PubMed Abstract: 

    Like a vast number of enzymes in nature, bacterial cytochrome P450 monooxygenases require an activated form of flavin as a cofactor for catalytic activity. Riboflavin is the precursor of FAD and FMN that serves as indispensable cofactor for flavoenzymes. In contrast to previous notions, herein we describe the identification of an electron-transfer process that is directly mediated by riboflavin for N-dealkylation by bacterial P450 monooxygenases. The electron relay from NADPH to riboflavin and then via activated oxygen to heme was proposed based on a combination of X-ray crystallography, molecular modeling and molecular dynamics simulation, site-directed mutagenesis and biochemical analysis of representative bacterial P450 monooxygenases. This study provides new insights into the electron transfer mechanism in bacterial P450 enzyme catalysis and likely in yeasts, fungi, plants and mammals.

  • Organizational Affiliation

    Laboratory of Chemical Biology and State Key Laboratory of Natural Medicines, China Pharmaceutical University, 639 Longmian Avenue, Nanjing, Jiangsu Province, 211198, P. R. China.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Putative P450-like enzyme
A, B, C, D
398Streptomyces himastatinicus ATCC 53653Mutation(s): 0 
Gene Names: hmtS
Find proteins for G0LWB2 (Streptomyces himastatinicus ATCC 53653)
Explore G0LWB2 
Go to UniProtKB:  G0LWB2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupG0LWB2
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.00 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.222 
  • R-Value Observed: 0.223 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 56.956α = 78.27
b = 78.469β = 72.63
c = 97.68γ = 69.46
Software Package:
Software NamePurpose
HKL-3000data scaling
PDB_EXTRACTdata extraction
DENZOdata reduction

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2019-02-06
    Type: Initial release
  • Version 1.1: 2020-05-06
    Changes: Database references
  • Version 1.2: 2024-03-27
    Changes: Data collection, Database references, Derived calculations