The first ketoreductase of the erythromycin synthase (crystal form 1)

Experimental Data Snapshot

  • Resolution: 1.81 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.235 
  • R-Value Observed: 0.235 

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This is version 1.2 of the entry. See complete history


The Structure of a Ketoreductase Determines the Organization of the beta-Carbon Processing Enzymes of Modular Polyketide Synthases

Keatinge-Clay, A.T.Stroud, R.M.

(2006) Structure 14: 737-748

  • DOI: https://doi.org/10.1016/j.str.2006.01.009
  • Primary Citation of Related Structures:  
    2FR0, 2FR1

  • PubMed Abstract: 

    The structure of the ketoreductase (KR) from the first module of the erythromycin synthase with NADPH bound was solved to 1.79 A resolution. The 51 kDa domain has two subdomains, each similar to a short-chain dehydrogenase/reductase (SDR) monomer. One subdomain has a truncated Rossmann fold and serves a purely structural role stabilizing the other subdomain, which catalyzes the reduction of the beta-carbonyl of a polyketide and possibly the epimerization of an alpha-substituent. The structure enabled us to define the domain boundaries of KR, the dehydratase (DH), and the enoylreductase (ER). It also constrains the three-dimensional organization of these domains within a module, revealing that KR does not make dimeric contacts across the 2-fold axis of the module. The quaternary structure elucidates how substrates are shuttled between the active sites of polyketide synthases (PKSs), as well as related fatty acid synthases (FASs), and suggests how domains can be swapped to make hybrid synthases that produce novel polyketides.

  • Organizational Affiliation

    Department of Biochemistry and Biophysics, University of California, San Francisco, 600 16(th) Street, San Francisco, California 94107, USA. adriankc@msg.ucsf.edu

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Erythromycin synthase, EryAI486Saccharopolyspora erythraeaMutation(s): 0 
Gene Names: eryAIeryA
EC: (PDB Primary Data), (UniProt)
Find proteins for Q03131 (Saccharopolyspora erythraea)
Explore Q03131 
Go to UniProtKB:  Q03131
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ03131
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on NDP

Download Ideal Coordinates CCD File 
C21 H30 N7 O17 P3
Experimental Data & Validation

Experimental Data

  • Resolution: 1.81 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.235 
  • R-Value Observed: 0.235 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 43.211α = 94.73
b = 46.332β = 90.17
c = 61.506γ = 98.89
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-04-04
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance