5A7V

The GH130 family of mannoside phosphorylases contains glycoside hydrolases that target beta-1,2 mannosidic linkages in Candida mannan


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.35 Å
  • R-Value Free: 0.150 
  • R-Value Work: 0.130 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The Gh130 Family of Mannoside Phosphorylases Contains Glycoside Hydrolases that Target Beta-1,2 Mannosidic Linkages in Candida Mannan

Cuskin, F.Basle, A.Day, A.M.Ladeveze, S.Potocki-Veronese, G.Davies, G.J.Gilbert, H.J.Lowe, E.

(2015) J.Biol.Chem. 290: 25023

  • DOI: 10.1074/jbc.M115.681460

  • PubMed Abstract: 
  • The depolymerization of complex glycans is an important biological process that is of considerable interest to environmentally relevant industries. β-Mannose is a major component of plant structural polysaccharides and eukaryotic N-glycans. These lin ...

    The depolymerization of complex glycans is an important biological process that is of considerable interest to environmentally relevant industries. β-Mannose is a major component of plant structural polysaccharides and eukaryotic N-glycans. These linkages are primarily cleaved by glycoside hydrolases, although recently, a family of glycoside phosphorylases, GH130, have also been shown to target β-1,2- and β-1,4-mannosidic linkages. In these phosphorylases, bond cleavage was mediated by a single displacement reaction in which phosphate functions as the catalytic nucleophile. A cohort of GH130 enzymes, however, lack the conserved basic residues that bind the phosphate nucleophile, and it was proposed that these enzymes function as glycoside hydrolases. Here we show that two Bacteroides enzymes, BT3780 and BACOVA_03624, which lack the phosphate binding residues, are indeed β-mannosidases that hydrolyze β-1,2-mannosidic linkages through an inverting mechanism. Because the genes encoding these enzymes are located in genetic loci that orchestrate the depolymerization of yeast α-mannans, it is likely that the two enzymes target the β-1,2-mannose residues that cap the glycan produced by Candida albicans. The crystal structure of BT3780 in complex with mannose bound in the -1 and +1 subsites showed that a pair of glutamates, Glu(227) and Glu(268), hydrogen bond to O1 of α-mannose, and either of these residues may function as the catalytic base. The candidate catalytic acid and the other residues that interact with the active site mannose are conserved in both GH130 mannoside phosphorylases and β-1,2-mannosidases. Functional phylogeny identified a conserved lysine, Lys(199) in BT3780, as a key specificity determinant for β-1,2-mannosidic linkages.


    Organizational Affiliation

    From the Institute for Cell and Molecular Biosciences, Medical School Newcastle University, Newcastle upon Tyne NE2 4HH, United Kingdom.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PUTATIVE GLYCOSIDASE PH117-RELATED
A
388Bacteroides thetaiotaomicron (strain ATCC 29148 / DSM 2079 / NCTC 10582 / E50 / VPI-5482)Mutation(s): 0 
Find proteins for Q8A186 (Bacteroides thetaiotaomicron (strain ATCC 29148 / DSM 2079 / NCTC 10582 / E50 / VPI-5482))
Go to UniProtKB:  Q8A186
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
PUTATIVE GLYCOSIDASE PH117-RELATED
B
388Bacteroides thetaiotaomicron (strain ATCC 29148 / DSM 2079 / NCTC 10582 / E50 / VPI-5482)Mutation(s): 0 
Find proteins for Q8A186 (Bacteroides thetaiotaomicron (strain ATCC 29148 / DSM 2079 / NCTC 10582 / E50 / VPI-5482))
Go to UniProtKB:  Q8A186
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

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

Download SDF File 
Download CCD File 
A, B
ALPHA-D-MANNOSE
C6 H12 O6
WQZGKKKJIJFFOK-PQMKYFCFSA-N
 Ligand Interaction
BMA
Query on BMA

Download SDF File 
Download CCD File 
A, B
BETA-D-MANNOSE
C6 H12 O6
WQZGKKKJIJFFOK-RWOPYEJCSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
UNK
Query on UNK
A
L-PEPTIDE LINKINGC4 H9 N O2

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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.35 Å
  • R-Value Free: 0.150 
  • R-Value Work: 0.130 
  • Space Group: P 21 2 21
Unit Cell:
Length (Å)Angle (°)
a = 75.767α = 90.00
b = 118.110β = 90.00
c = 126.586γ = 90.00
Software Package:
Software NamePurpose
Aimlessdata scaling
REFMACrefinement
XDSdata reduction
MOLREPphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-08-26
    Type: Initial release
  • Version 1.1: 2015-09-02
    Type: Database references
  • Version 1.2: 2015-10-21
    Type: Database references