RedJ-Thioesterase from the Prodiginine biosynthetic pathway in Streptomyces coelicolor

Experimental Data Snapshot

  • Resolution: 2.12 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.201 
  • R-Value Observed: 0.203 

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Structure and Function of the RedJ Protein, a Thioesterase from the Prodiginine Biosynthetic Pathway in Streptomyces coelicolor.

Whicher, J.R.Florova, G.Sydor, P.K.Singh, R.Alhamadsheh, M.Challis, G.L.Reynolds, K.A.Smith, J.L.

(2011) J Biol Chem 286: 22558-22569

  • DOI: https://doi.org/10.1074/jbc.M110.213512
  • Primary Citation of Related Structures:  
    3QMV, 3QMW

  • PubMed Abstract: 

    Prodiginines are a class of red-pigmented natural products with immunosuppressant, anticancer, and antimalarial activities. Recent studies on prodiginine biosynthesis in Streptomyces coelicolor have elucidated the function of many enzymes within the pathway. However, the function of RedJ, which was predicted to be an editing thioesterase based on sequence similarity, is unknown. We report here the genetic, biochemical, and structural characterization of the redJ gene product. Deletion of redJ in S. coelicolor leads to a 75% decrease in prodiginine production, demonstrating its importance for prodiginine biosynthesis. RedJ exhibits thioesterase activity with selectivity for substrates having long acyl chains and lacking a β-carboxyl substituent. The thioesterase has 1000-fold greater catalytic efficiency with substrates linked to an acyl carrier protein (ACP) than with the corresponding CoA thioester substrates. Also, RedJ strongly discriminates against the streptomycete ACP of fatty acid biosynthesis in preference to RedQ, an ACP of the prodiginine pathway. The 2.12 Å resolution crystal structure of RedJ provides insights into the molecular basis for the observed substrate selectivity. A hydrophobic pocket in the active site chamber is positioned to bind long acyl chains, as suggested by a long-chain ligand from the crystallization solution bound in this pocket. The accessibility of the active site is controlled by the position of a highly flexible entrance flap. These data combined with previous studies of prodiginine biosynthesis in S. coelicolor support a novel role for RedJ in facilitating transfer of a dodecanoyl chain from one acyl carrier protein to another en route to the key biosynthetic intermediate 2-undecylpyrrole.

  • Organizational Affiliation

    Chemical Biology Graduate Program, University of Michigan, Ann Arbor, Michigan 48109, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C, D
280Streptomyces coelicolorMutation(s): 0 
Gene Names: SCO5894SC3F7.14
EC: 3.1.2
Find proteins for O54157 (Streptomyces coelicolor (strain ATCC BAA-471 / A3(2) / M145))
Explore O54157 
Go to UniProtKB:  O54157
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO54157
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on MSE
A, B, C, D
Experimental Data & Validation

Experimental Data

  • Resolution: 2.12 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.201 
  • R-Value Observed: 0.203 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 74.813α = 90
b = 79.399β = 90.12
c = 87.438γ = 90
Software Package:
Software NamePurpose
Blu-Icedata 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: 2011-05-04
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance