Crystal Structure of [KS3][AT3] didomain from module 3 of 6-deoxyerthronolide B synthase

Experimental Data Snapshot

  • Resolution: 2.59 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.214 
  • R-Value Observed: 0.217 

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Structural and mechanistic analysis of protein interactions in module 3 of the 6-deoxyerythronolide B synthase

Tang, Y.Chen, Y.A.Kim, C.Y.Cane, E.D.Khosla, C.

(2007) Chem Biol 14: 931-943

  • DOI: https://doi.org/10.1016/j.chembiol.2007.07.012
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    We report the 2.6 A X-ray crystal structure of a 190 kDa homodimeric fragment from module 3 of the 6-deoxyerthronolide B synthase covalently bound to the inhibitor cerulenin. The structure shows two well-organized interdomain linker regions in addition to the full-length ketosynthase (KS) and acyltransferase (AT) domains. Analysis of the substrate-binding site of the KS domain suggests that a loop region at the homodimer interface influences KS substrate specificity. We also describe a model for the interaction of the catalytic domains with the acyl carrier protein (ACP) domain. The ACP is proposed to dock within a deep cleft between the KS and AT domains, with interactions that span both the KS homodimer and AT domain. In conjunction with other recent data, our results provide atomic resolution pictures of several catalytically relevant protein interactions in this remarkable family of modular megasynthases.

  • Organizational Affiliation

    Department of Chemistry, Keck Building, Stanford University, Stanford, CA 94305, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
EryAII Erythromycin polyketide synthase modules 3 and 4
A, B
915Saccharopolyspora erythraeaMutation(s): 0 
Gene Names: eryAIIeryA
Find proteins for Q03132 (Saccharopolyspora erythraea)
Explore Q03132 
Go to UniProtKB:  Q03132
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ03132
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.59 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.214 
  • R-Value Observed: 0.217 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 75.203α = 90
b = 139.005β = 106.14
c = 102.342γ = 90
Software Package:
Software NamePurpose
HKL-2000data 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: 2007-09-04
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance