OxyS anhydrotetracycline hydroxylase from Streptomyces rimosus

Experimental Data Snapshot

  • Resolution: 2.55 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.189 

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This is version 1.2 of the entry. See complete history


Uncovering the Enzymes that Catalyze the Final Steps in Oxytetracycline Biosynthesis.

Wang, P.Bashiri, G.Gao, X.Sawaya, M.R.Tang, Y.

(2013) J Am Chem Soc 135: 7138-7141

  • DOI: https://doi.org/10.1021/ja403516u
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Tetracyclines are a group of natural products sharing a linearly fused four-ring scaffold, which is essential for their broad-spectrum antibiotic activities. Formation of the key precursor anhydrotetracycline 3 during oxytetracycline 1 biosynthesis has been previously characterized. However, the enzymatic steps that transform 3 into 1, including the additional hydroxylation at C5 and the final C5a-C11a reduction, have remained elusive. Here we report two redox enzymes, OxyS and OxyR, are sufficient to convert 3 to 1. OxyS catalyzes two sequential hydroxylations at C6 and C5 positions of 3 with opposite stereochemistry, while OxyR catalyzes the C5a-C11a reduction using F420 as a cofactor to produce 1. The crystal structure of OxyS was obtained to provide insights into the tandem C6- and C5-hydroxylation steps. The substrate specificities of OxyS and OxyR were shown to influence the relative ratio of 1 and tetracycline 2.

  • Organizational Affiliation

    Department of Chemical and Biomolecular Engineering, University of California Los Angeles, Los Angeles, California 90095, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Polyketide oxygenase/hydroxylase
A, B
523Streptomyces rimosus subsp. rimosus ATCC 10970Mutation(s): 0 
Gene Names: oxySSRIM_10936
Find proteins for L8EUQ6 (Streptomyces rimosus subsp. rimosus (strain ATCC 10970 / DSM 40260 / JCM 4667 / NRRL 2234))
Explore L8EUQ6 
Go to UniProtKB:  L8EUQ6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupL8EUQ6
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on FAD

Download Ideal Coordinates CCD File 
C [auth A],
D [auth B]
C27 H33 N9 O15 P2
Experimental Data & Validation

Experimental Data

  • Resolution: 2.55 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.189 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 76.06α = 90
b = 115.13β = 90
c = 121.03γ = 90
Software Package:
Software NamePurpose
XSCALEdata scaling
PDB_EXTRACTdata extraction
ADSCdata collection

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-05-15
    Type: Initial release
  • Version 1.1: 2013-06-19
    Changes: Database references
  • Version 1.2: 2023-09-20
    Changes: Data collection, Database references, Derived calculations, Refinement description