Trans-acting transferase from Disorazole synthase in complex with Acetate

Experimental Data Snapshot

  • Resolution: 1.35 Å
  • R-Value Free: 0.174 
  • R-Value Work: 0.161 
  • R-Value Observed: 0.162 

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This is version 1.3 of the entry. See complete history


Structure and Mechanism of the trans-Acting Acyltransferase from the Disorazole Synthase.

Wong, F.T.Jin, X.Mathews, I.I.Cane, D.E.Khosla, C.

(2011) Biochemistry 50: 6539-6548

  • DOI: https://doi.org/10.1021/bi200632j
  • Primary Citation of Related Structures:  
    3RGI, 3SBM

  • PubMed Abstract: 

    The 1.51 Å resolution X-ray crystal structure of the trans-acyltransferase (AT) from the "AT-less" disorazole synthase (DSZS) and that of its acetate complex at 1.35 Å resolution are reported. Separately, comprehensive alanine-scanning mutagenesis of one of its acyl carrier protein substrates (ACP1 from DSZS) led to the identification of a conserved Asp45 residue on the ACP, which contributes to the substrate specificity of this unusual enzyme. Together, these experimental findings were used to derive a model for the selective association of the DSZS AT and its ACP substrate. With a goal of structurally characterizing the AT-ACP interface, a strategy was developed for covalently cross-linking the active site Ser → Cys mutant of the DSZS AT to its ACP substrate and for purifying the resulting AT-ACP complex to homogeneity. The S86C DSZS AT mutant was found to be functional, albeit with a transacylation efficiency 200-fold lower than that of its wild-type counterpart. Our findings provide new insights as well as new opportunities for high-resolution analysis of an important protein-protein interface in polyketide synthases.

  • Organizational Affiliation

    Department of Chemical Engineering, Department of Chemistry, and §Department of Biochemistry, Stanford University , Stanford, California 94305, United States.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
DisD protein281Sorangium cellulosumMutation(s): 0 
Gene Names: dszDdisD
Find proteins for Q4U443 (Sorangium cellulosum)
Explore Q4U443 
Go to UniProtKB:  Q4U443
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ4U443
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.35 Å
  • R-Value Free: 0.174 
  • R-Value Work: 0.161 
  • R-Value Observed: 0.162 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 43.03α = 90
b = 54.01β = 90
c = 120.71γ = 90
Software Package:
Software NamePurpose
Blu-Icedata collection
XDSdata reduction
XDSdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-07-13
    Type: Initial release
  • Version 1.1: 2011-08-24
    Changes: Database references
  • Version 1.2: 2017-11-08
    Changes: Refinement description
  • Version 1.3: 2023-09-13
    Changes: Data collection, Database references, Derived calculations, Refinement description