2Y0C

BceC mutation Y10S


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.197 
  • R-Value Work: 0.163 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Structure of Burkholderia Cepacia Udp-Glucose Dehydrogenase (Ugd) Bcec and Role of Tyr10 in Final Hydrolysis of Ugd Thioester Intermediate.

Rocha, J.Popescu, A.O.Borges, P.Mil-Homens, D.Moreira, L.M.Sa-Correia, I.Fialho, A.M.Frazao, C.

(2011) J.Bacteriol. 193: 3978

  • DOI: 10.1128/JB.01076-10
  • Primary Citation of Related Structures:  2Y0D, 2Y0E

  • PubMed Abstract: 
  • Members of the Burkholderia cepacia complex (BCC) are serious respiratory pathogens in immunocompromised individuals and in patients with cystic fibrosis (CF). They are exceptionally resistant to many antimicrobial agents and have the capacity to spr ...

    Members of the Burkholderia cepacia complex (BCC) are serious respiratory pathogens in immunocompromised individuals and in patients with cystic fibrosis (CF). They are exceptionally resistant to many antimicrobial agents and have the capacity to spread between patients, leading to a decline in lung function and necrotizing pneumonia. BCC members often express a mucoid phenotype associated with the secretion of the exopolysaccharide (EPS) cepacian. There is much evidence supporting the fact that cepacian is a major virulence factor of BCC. UDP-glucose dehydrogenase (UGD) is responsible for the NAD-dependent 2-fold oxidation of UDP-glucose (UDP-Glc) to UDP-glucuronic acid (UDP-GlcA), which is a key step in cepacian biosynthesis. Here, we report the structure of BceC, determined at 1.75-Å resolution. Mutagenic studies were performed on the active sites of UGDs, and together with the crystallographic structures, they elucidate the molecular mechanism of this family of sugar nucleotide-modifying enzymes. Superposition with the structures of human and other bacterial UGDs showed an active site with high structural homology. This family contains a strictly conserved tyrosine residue (Y10 in BceC; shown in italics) within the glycine-rich motif (GXGYXG) of its N-terminal Rossmann-like domain. We constructed several BceC Y10 mutants, revealing only residual dehydrogenase activity and thus highlighting the importance of this conserved residue in the catalytic activity of BceC. Based on the literature of the UGD/GMD nucleotide sugar 6-dehydrogenase family and the kinetic and structural data we obtained for BceC, we determined Y10 as a key catalytic residue in a UGD rate-determining step, the final hydrolysis of the enzymatic thioester intermediate.


    Related Citations: 
    • Cloning, Expression, Purification, Crystallization and Preliminary Crystallographic Studies of Bcec, a Udp-Glucose Dehydrogenase from Burkholderia Cepacia Ist408.
      Rocha, J.,Popescu, A.O.,Sa-Correia, I.,Fialho, A.M.,Frazao, C.
      (2010) Acta Crystallogr.,Sect.F 66: 269


    Organizational Affiliation

    Instituto de Tecnologia Química e Biológica, Universidade Nova de Lisboa, Apartado 127, P-2781-901 Oeiras, Portugal.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
UDP-GLUCOSE DEHYDROGENASE
A, B, C, D
478Burkholderia cepaciaN/A
Find proteins for C9E261 (Burkholderia cepacia)
Go to UniProtKB:  C9E261
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A, B, C, D
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
ACT
Query on ACT

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Download CCD File 
A, B, C, D
ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
UGA
Query on UGA

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Download CCD File 
A, B, C, D
URIDINE-5'-DIPHOSPHATE-GLUCURONIC ACID
UDP-GLUCURONIC ACID
C15 H22 N2 O18 P2
HDYANYHVCAPMJV-LXQIFKJMSA-N
 Ligand Interaction
GOL
Query on GOL

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Download CCD File 
A, B, C, D
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
TRS
Query on TRS

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Download CCD File 
A
2-AMINO-2-HYDROXYMETHYL-PROPANE-1,3-DIOL
TRIS BUFFER
C4 H12 N O3
LENZDBCJOHFCAS-UHFFFAOYSA-O
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.197 
  • R-Value Work: 0.163 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 97.358α = 90.00
b = 108.620β = 90.00
c = 187.464γ = 90.00
Software Package:
Software NamePurpose
MOSFLMdata reduction
PHENIXphasing
SCALAdata scaling
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-07-27
    Type: Initial release