5D3K

Crystal structure of the thioesterase domain of deoxyerythronolide B synthase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7 Å
  • R-Value Free: 0.187 
  • R-Value Work: 0.156 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Towards a characterization of the structural determinants of specificity in the macrocyclizing thioesterase for deoxyerythronolide B biosynthesis.

Argyropoulos, P.Bergeret, F.Pardin, C.Reimer, J.M.Pinto, A.Boddy, C.N.Schmeing, T.M.

(2015) Biochim.Biophys.Acta 1860: 486-497

  • DOI: 10.1016/j.bbagen.2015.11.007
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Type I polyketide synthases (PKSs) are giant multidomain proteins that synthesize many therapeutics and other natural products. The synthesis proceeds by a thiotemplate mechanism whereby intermediates are covalently attached to the PKS. The release o ...

    Type I polyketide synthases (PKSs) are giant multidomain proteins that synthesize many therapeutics and other natural products. The synthesis proceeds by a thiotemplate mechanism whereby intermediates are covalently attached to the PKS. The release of the final polyketide is catalyzed by the terminal thioesterase (TE) domain through hydrolysis, transesterification, or macrocyclization. The PKS 6-deoxyerythronolide B synthase (DEBS) produces the 14-membered macrolide core of the clinically important antibiotic erythromycin. The TE domain of DEBS (DEBS TE) has well-established, empirically-defined specificities for hydrolysis or macrocyclization of native and modified substrates. We present efforts towards understanding the structural basis for the specificity of the thioesterase reaction in DEBS TE using a set of novel diphenyl alkylphosphonates, which mimic substrates that are specifically cyclized or hydrolyzed by DEBS TE. We have determined structures of a new construct of DEBS TE alone at 1.7Å, and DEBS TE bound with a simple allylphosphonate at 2.1Å resolution. Other, more complex diphenyl alkylphosphonates inhibit DEBS TE, but we were unable to visualize these faithful cyclization analogs in complex with DEBS TE. This work represents a first step towards using DEBS TE complexed with sophisticated substrate analogs to decipher the specificity determinants in this important reaction.


    Organizational Affiliation

    Department of Chemistry and Biomolecular Sciences, Centre for Catalysis Research and Innovation, University of Ottawa, Ottawa, ON, K1N 6N5, Canada.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Erythronolide synthase, modules 5 and 6
A
269Saccharopolyspora erythraeaMutation(s): 0 
Gene Names: eryA
EC: 2.3.1.94
Find proteins for Q03133 (Saccharopolyspora erythraea)
Go to UniProtKB:  Q03133
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download SDF File 
Download CCD File 
A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
1PE
Query on 1PE

Download SDF File 
Download CCD File 
A
PENTAETHYLENE GLYCOL
PEG400
C10 H22 O6
JLFNLZLINWHATN-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7 Å
  • R-Value Free: 0.187 
  • R-Value Work: 0.156 
  • Space Group: P 3 2 1
Unit Cell:
Length (Å)Angle (°)
a = 112.920α = 90.00
b = 112.920β = 90.00
c = 42.970γ = 120.00
Software Package:
Software NamePurpose
REFMACphasing
PDB_EXTRACTdata extraction
SCALAdata scaling
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Canadian Institutes of Health ResearchCanadaMOP 106615

Revision History 

  • Version 1.0: 2015-12-09
    Type: Initial release
  • Version 1.1: 2016-01-13
    Type: Database references