The first ketoreductase of the tylosin PKS

Experimental Data Snapshot

  • Resolution: 1.95 Å
  • R-Value Free: 0.287 
  • R-Value Work: 0.259 
  • R-Value Observed: 0.259 

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This is version 1.3 of the entry. See complete history


A tylosin ketoreductase reveals how chirality is determined in polyketides

Keatinge-Clay, A.T.

(2007) Chem Biol 14: 898-908

  • DOI: https://doi.org/10.1016/j.chembiol.2007.07.009
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Because it controls the majority of polyketide stereocenters, the ketoreductase (KR) is a central target in engineering polyketide synthases (PKSs). To elucidate the mechanisms of stereocontrol, the structure of KR from the first module of the tylosin PKS was determined. A comparison with a recently solved erythromycin KR that operates on the same substrate explains why their products have opposite alpha-substituent chiralities. The structure reveals how polyketides are guided into the active site by key residues in different KR types. There are four types of reductase-competent KRs, each capable of fixing a unique combination of alpha-substituent and beta-hydroxyl group chiralities, as well as two types of reductase-incompetent KRs that control alpha-substituent chirality alone. A protocol to assign how a module will enforce substituent chirality based on its sequence is presented.

  • Organizational Affiliation

    Department of Biochemistry and Biophysics, University of California, San Francisco, San Francisco, CA 94158, USA. adriankc@msg.ucsf.edu

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Tylactone synthase starter module and modules 1 & 2511Streptomyces fradiaeMutation(s): 0 
Gene Names: tylG
Find proteins for O33954 (Streptomyces fradiae)
Explore O33954 
Go to UniProtKB:  O33954
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO33954
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.95 Å
  • R-Value Free: 0.287 
  • R-Value Work: 0.259 
  • R-Value Observed: 0.259 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 66.18α = 90
b = 49.81β = 109.2
c = 68.81γ = 90
Software Package:
Software NamePurpose
ADSCdata collection
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-08-28
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2014-11-12
    Changes: Structure summary
  • Version 1.3: 2023-11-01
    Changes: Data collection, Database references, Refinement description