3UKH

Crystal structure of udp-galactopyranose mutase from Aspergillus fumigatus in complex with UDPGALP (non-reduced)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.222 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural Insight into the Unique Substrate Binding Mechanism and Flavin Redox State of UDP-galactopyranose Mutase from Aspergillus fumigatus.

van Straaten, K.E.Routier, F.H.Sanders, D.A.

(2012) J.Biol.Chem. 287: 10780-10790

  • DOI: 10.1074/jbc.M111.322974
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • UDP-galactopyranose mutase (UGM) is a flavin-containing enzyme that catalyzes the reversible conversion of UDP-galactopyranose (UDP-Galp) to UDP-galactofuranose (UDP-Galf). As in prokaryotic UGMs, the flavin needs to be reduced for the enzyme to be a ...

    UDP-galactopyranose mutase (UGM) is a flavin-containing enzyme that catalyzes the reversible conversion of UDP-galactopyranose (UDP-Galp) to UDP-galactofuranose (UDP-Galf). As in prokaryotic UGMs, the flavin needs to be reduced for the enzyme to be active. Here we present the first eukaryotic UGM structures from Aspergillus fumigatus (AfUGM). The structures are of UGM alone, with the substrate UDP-Galp and with the inhibitor UDP. Additionally, we report the structures of AfUGM bound to substrate with oxidized and reduced flavin. These structures provide insight into substrate recognition and structural changes observed upon substrate binding involving the mobile loops and the critical arginine residues Arg-182 and Arg-327. Comparison with prokaryotic UGM reveals that despite low sequence identity with known prokaryotic UGMs the overall fold is largely conserved. Structural differences between prokaryotic UGM and AfUGM result from inserts in AfUGM. A notable difference from prokaryotic UGMs is that AfUGM contains a third flexible loop (loop III) above the si-face of the isoalloxazine ring that changes position depending on the redox state of the flavin cofactor. This loop flipping has not been observed in prokaryotic UGMs. In addition we have determined the crystals structures and steady-state kinetic constants of the reaction catalyzed by mutants R182K, R327K, R182A, and R327A. These results support our hypothesis that Arg-182 and Arg-327 play important roles in stabilizing the position of the diphosphates of the nucleotide sugar and help to facilitate the positioning of the galactose moiety for catalysis.


    Organizational Affiliation

    Department of Chemistry, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5C9, Canada.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
UDP-galactopyranose mutase
A, B, C, D, E, F, G, H
519Neosartorya fumigataMutation(s): 0 
Gene Names: glf (glfA)
EC: 5.4.99.9
Find proteins for Q4W1X2 (Neosartorya fumigata)
Go to UniProtKB:  Q4W1X2
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

Download SDF File 
Download CCD File 
A, B
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
FAD
Query on FAD

Download SDF File 
Download CCD File 
A, B, D, E, F, G
FLAVIN-ADENINE DINUCLEOTIDE
C27 H33 N9 O15 P2
VWWQXMAJTJZDQX-UYBVJOGSSA-N
 Ligand Interaction
GDU
Query on GDU

Download SDF File 
Download CCD File 
A, B, C, D, E, F, G, H
GALACTOSE-URIDINE-5'-DIPHOSPHATE
UDP-D-GALACTOPYRANOSE
C15 H24 N2 O17 P2
HSCJRCZFDFQWRP-ABVWGUQPSA-N
 Ligand Interaction
FDA
Query on FDA

Download SDF File 
Download CCD File 
C, H
DIHYDROFLAVINE-ADENINE DINUCLEOTIDE
C27 H35 N9 O15 P2
YPZRHBJKEMOYQH-UYBVJOGSSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.222 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 71.967α = 89.87
b = 129.262β = 84.64
c = 173.885γ = 81.21
Software Package:
Software NamePurpose
d*TREKdata scaling
d*TREKdata reduction
PHENIXrefinement
PDB_EXTRACTdata extraction
MOLREPphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-02-22
    Type: Initial release
  • Version 1.1: 2012-03-07
    Type: Database references
  • Version 1.2: 2012-07-18
    Type: Database references