4GPN

The crystal structure of 6-P-beta-D-Glucosidase (E375Q mutant) from Streptococcus mutans UA150 in complex with Gentiobiose 6-phosphate.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.291 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.177 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

GH1-family 6-P-beta-glucosidases from human microbiome lactic acid bacteria.

Michalska, K.Tan, K.Li, H.Hatzos-Skintges, C.Bearden, J.Babnigg, G.Joachimiak, A.

(2013) Acta Crystallogr. D Biol. Crystallogr. 69: 451-463

  • DOI: 10.1107/S0907444912049608
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • In lactic acid bacteria and other bacteria, carbohydrate uptake is mostly governed by phosphoenolpyruvate-dependent phosphotransferase systems (PTSs). PTS-dependent translocation through the cell membrane is coupled with phosphorylation of the incomi ...

    In lactic acid bacteria and other bacteria, carbohydrate uptake is mostly governed by phosphoenolpyruvate-dependent phosphotransferase systems (PTSs). PTS-dependent translocation through the cell membrane is coupled with phosphorylation of the incoming sugar. After translocation through the bacterial membrane, the β-glycosidic bond in 6'-P-β-glucoside is cleaved, releasing 6-P-β-glucose and the respective aglycon. This reaction is catalyzed by 6-P-β-glucosidases, which belong to two glycoside hydrolase (GH) families: GH1 and GH4. Here, the high-resolution crystal structures of GH1 6-P-β-glucosidases from Lactobacillus plantarum (LpPbg1) and Streptococcus mutans (SmBgl) and their complexes with ligands are reported. Both enzymes show hydrolytic activity towards 6'-P-β-glucosides. The LpPbg1 structure has been determined in an apo form as well as in a complex with phosphate and a glucose molecule corresponding to the aglycon molecule. The S. mutans homolog contains a sulfate ion in the phosphate-dedicated subcavity. SmBgl was also crystallized in the presence of the reaction product 6-P-β-glucose. For a mutated variant of the S. mutans enzyme (E375Q), the structure of a 6'-P-salicin complex has also been determined. The presence of natural ligands enabled the definition of the structural elements that are responsible for substrate recognition during catalysis.


    Organizational Affiliation

    Midwest Center for Structural Genomics, Biosciences Division, Argonne National Laboratory, Argonne, Illinois, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
6-phospho-beta-D-Glucosidase
A, B
480Streptococcus mutans serotype c (strain ATCC 700610 / UA159)Mutation(s): 1 
Gene Names: bgl
EC: 3.2.1.86
Find proteins for Q8DT00 (Streptococcus mutans serotype c (strain ATCC 700610 / UA159))
Go to UniProtKB:  Q8DT00
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GOL
Query on GOL

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

Download SDF File 
Download CCD File 
A
2-AMINO-2-HYDROXYMETHYL-PROPANE-1,3-DIOL
TRIS BUFFER
C4 H12 N O3
LENZDBCJOHFCAS-UHFFFAOYSA-O
 Ligand Interaction
6GB
Query on 6GB

Download SDF File 
Download CCD File 
A, B
6-O-(6-O-phosphono-beta-D-glucopyranosyl)-beta-D-glucopyranose
gentiobiose 6-phosphate
C12 H23 O14 P
MPJUWDDYGSGMFC-LIZSDCNHSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.291 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.177 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 58.220α = 90.00
b = 91.796β = 102.23
c = 94.225γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-3000data reduction
HKL-3000data scaling
MOLREPphasing
SBC-Collectdata collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-10-03
    Type: Initial release
  • Version 1.1: 2017-11-15
    Type: Database references