5CXO

Intriguing role of epoxide hydrolase/cyclase-like enzyme SalBIII in pyran ring formation in polyether salinomycin


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.275 
  • R-Value Work: 0.211 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Enzymology of Pyran Ring A Formation in Salinomycin Biosynthesis.

Luhavaya, H.Dias, M.V.Williams, S.R.Hong, H.de Oliveira, L.G.Leadlay, P.F.

(2015) Angew.Chem.Int.Ed.Engl. 54: 13622-13625

  • DOI: 10.1002/anie.201507090

  • PubMed Abstract: 
  • Tetrahydropyran rings are a common feature of complex polyketide natural products, but much remains to be learned about the enzymology of their formation. The enzyme SalBIII from the salinomycin biosynthetic pathway resembles other polyether epoxide ...

    Tetrahydropyran rings are a common feature of complex polyketide natural products, but much remains to be learned about the enzymology of their formation. The enzyme SalBIII from the salinomycin biosynthetic pathway resembles other polyether epoxide hydrolases/cyclases of the MonB family, but SalBIII plays no role in the conventional cascade of ring opening/closing. Mutation in the salBIII gene gave a metabolite in which ring A is not formed. Using this metabolite in vitro as a substrate analogue, SalBIII has been shown to form pyran ring A. We have determined the X-ray crystal structure of SalBIII, and structure-guided mutagenesis of putative active-site residues has identified Asp38 and Asp104 as an essential catalytic dyad. The demonstrated pyran synthase activity of SalBIII further extends the impressive catalytic versatility of α+β barrel fold proteins.


    Organizational Affiliation

    Department of Biochemistry, University of Cambridge, 80 Tennis Court Road, Cambridge CB2 1GA (UK).




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Epoxide hydrolase
A, B
148Streptomyces albus (strain ATCC 21838 / DSM 41398 / FERM P-419 / JCM 4703 / NBRC 107858)Mutation(s): 0 
Gene Names: slnBI
Find proteins for H6D578 (Streptomyces albus (strain ATCC 21838 / DSM 41398 / FERM P-419 / JCM 4703 / NBRC 107858))
Go to UniProtKB:  H6D578
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
P6G
Query on P6G

Download SDF File 
Download CCD File 
A, B
HEXAETHYLENE GLYCOL
POLYETHYLENE GLYCOL PEG400
C12 H26 O7
IIRDTKBZINWQAW-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.275 
  • R-Value Work: 0.211 
  • Space Group: I 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 53.047α = 90.00
b = 101.935β = 90.00
c = 120.856γ = 90.00
Software Package:
Software NamePurpose
SCALAdata scaling
PHASERphasing
XDSdata reduction
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
FAPESPBrazil2010/15971-3

Revision History 

  • Version 1.0: 2015-09-30
    Type: Initial release
  • Version 1.1: 2015-11-11
    Type: Database references
  • Version 1.2: 2018-03-07
    Type: Data collection, Database references, Derived calculations