4D48

Crystal Structure of glucose-1-phosphate uridylyltransferase GalU from Erwinia amylovora.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.46 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.244 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Glucose-1-phosphate uridylyltransferase from Erwinia amylovora: Activity, structure and substrate specificity.

Benini, S.Toccafondi, M.Rejzek, M.Musiani, F.Wagstaff, B.A.Wuerges, J.Cianci, M.Field, R.A.

(2017) Biochim. Biophys. Acta 1865: 1348-1357

  • DOI: 10.1016/j.bbapap.2017.08.015

  • PubMed Abstract: 
  • Erwinia amylovora, a Gram-negative plant pathogen, is the causal agent of Fire Blight, a contagious necrotic disease affecting plants belonging to the Rosaceae family, including apple and pear. E. amylovora is highly virulent and capable of rapid dis ...

    Erwinia amylovora, a Gram-negative plant pathogen, is the causal agent of Fire Blight, a contagious necrotic disease affecting plants belonging to the Rosaceae family, including apple and pear. E. amylovora is highly virulent and capable of rapid dissemination in orchards; effective control methods are still lacking. One of its most important pathogenicity factors is the exopolysaccharide amylovoran. Amylovoran is a branched polymer made by the repetition of units mainly composed of galactose, with some residues of glucose, glucuronic acid and pyruvate. E. amylovora glucose-1-phosphate uridylyltransferase (UDP-glucose pyrophosphorylase, EC 2.7.7.9) has a key role in amylovoran biosynthesis. This enzyme catalyses the production of UDP-glucose from glucose-1-phosphate and UTP, which the epimerase GalE converts into UDP-galactose, the main building block of amylovoran. We determined EaGalU kinetic parameters and substrate specificity with a range of sugar 1-phosphates. At time point 120min the enzyme catalysed conversion of the sugar 1-phosphate into the corresponding UDP-sugar reached 74% for N-acetyl-α-d-glucosamine 1-phosphate, 28% for α-d-galactose 1-phosphate, 0% for α-d-galactosamine 1-phosphate, 100% for α-d-xylose 1-phosphate, 100% for α-d-glucosamine 1-phosphate, 70% for α-d-mannose 1-phosphate, and 0% for α-d-galacturonic acid 1-phosphate. To explain our results we obtained the crystal structure of EaGalU and augmented our study by docking the different sugar 1-phosphates into EaGalU active site, providing both reliable models for substrate binding and enzyme specificity, and a rationale that explains the different activity of EaGalU on the sugar 1-phosphates used. These data demonstrate EaGalU potential as a biocatalyst for biotechnological purposes, as an alternative to the enzyme from Escherichia coli, besides playing an important role in E. amylovora pathogenicity.


    Related Citations: 
    • Expression, purification, crystallization and preliminary X-ray analysis of glucose-1-phosphate uridylyltransferase (GalU) from Erwinia amylovora.
      Toccafondi, M.,Cianci, M.,Benini, S.
      (2014) Acta Crystallogr F Struct Biol Commun 70: 1249


    Organizational Affiliation

    Bioorganic Chemistry and Bio-Crystallography laboratory (B2Cl), Faculty of Science and Technology, Free University of Bolzano, 39100 Bolzano, Italy. Electronic address: stefano.benini@unibz.it.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
GLUCOSE-1-PHOSPHATE URIDYLYLTRANSFERASE
A, B
302Erwinia amylovora (strain CFBP1430)Mutation(s): 0 
Gene Names: galU
EC: 2.7.7.9
Find proteins for D4I3X5 (Erwinia amylovora (strain CFBP1430))
Go to UniProtKB:  D4I3X5
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.46 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.244 
  • Space Group: P 62
Unit Cell:
Length (Å)Angle (°)
a = 80.673α = 90.00
b = 80.673β = 90.00
c = 169.182γ = 120.00
Software Package:
Software NamePurpose
BALBESphasing
REFMACrefinement
XDSdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2016-01-20
    Type: Initial release
  • Version 1.1: 2018-03-14
    Type: Structure summary