4PTV

Halothermothrix orenii beta-glucosidase A, thiocellobiose complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.196 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Biochemical and structural characterization of a thermostable beta-glucosidase from Halothermothrix orenii for galacto-oligosaccharide synthesis.

Hassan, N.Nguyen, T.H.Intanon, M.Kori, L.D.Patel, B.K.C.Haltrich, D.Divne, C.Tan, T.C.

(2014) Appl.Microbiol.Biotechnol. --: --

  • DOI: 10.1007/s00253-014-6015-x
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Lactose is a major disaccharide by-product from the dairy industries, and production of whey alone amounts to about 200 million tons globally each year. Thus, it is of particular interest to identify improved enzymatic processes for lactose utilizati ...

    Lactose is a major disaccharide by-product from the dairy industries, and production of whey alone amounts to about 200 million tons globally each year. Thus, it is of particular interest to identify improved enzymatic processes for lactose utilization. Microbial β-glucosidases (BGL) with significant β-galactosidase (BGAL) activity can be used to convert lactose to glucose (Glc) and galactose (Gal), and most retaining BGLs also synthesize more complex sugars from the monosaccharides by transglycosylation, such as galacto-oligosaccharides (GOS), which are prebiotic compounds that stimulate growth of beneficial gut bacteria. In this work, a BGL from the thermophilic and halophilic bacterium Halothermothrix orenii, HoBGLA, was characterized biochemically and structurally. It is an unspecific β-glucosidase with mixed activities for different substrates and prominent activity with various galactosidases such as lactose. We show that HoBGLA is an attractive candidate for industrial lactose conversion based on its high activity and stability within a broad pH range (4.5-7.5), with maximal β-galactosidase activity at pH 6.0. The temperature optimum is in the range of 65-70 °C, and HoBGLA also shows excellent thermostability at this temperature range. The main GOS products from HoBGLA transgalactosylation are β-D-Galp-(1→6)-D-Lac (6GALA) and β-D-Galp-(1→3)-D-Lac (3GALA), indicating that D-lactose is a better galactosyl acceptor than either of the monosaccharides. To evaluate ligand binding and guide GOS modeling, crystal structures of HoBGLA were determined in complex with thiocellobiose, 2-deoxy-2-fluoro-D-glucose and glucose. The two major GOS products, 3GALA and 6GALA, were modeled in the substrate-binding cleft of wild-type HoBGLA and shown to be favorably accommodated.


    Organizational Affiliation

    KTH Royal Institute of Technology, School of Biotechnology, Albanova University Center, Roslagstullsbacken 21, S-10691, Stockholm, Sweden.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Glycoside hydrolase family 1
A, B
452Halothermothrix orenii (strain H 168 / OCM 544 / DSM 9562)Mutation(s): 0 
EC: 3.2.1.21
Find proteins for B8CYA8 (Halothermothrix orenii (strain H 168 / OCM 544 / DSM 9562))
Go to UniProtKB:  B8CYA8
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PE4
Query on PE4

Download SDF File 
Download CCD File 
A, B
2-{2-[2-(2-{2-[2-(2-ETHOXY-ETHOXY)-ETHOXY]-ETHOXY}-ETHOXY)-ETHOXY]-ETHOXY}-ETHANOL
POLYETHYLENE GLYCOL PEG4000
C16 H34 O8
PJWQOENWHPEPKI-UHFFFAOYSA-N
 Ligand Interaction
CS
Query on CS

Download SDF File 
Download CCD File 
A, B
CESIUM ION
Cs
NCMHKCKGHRPLCM-UHFFFAOYSA-N
 Ligand Interaction
TCB
Query on TCB

Download SDF File 
Download CCD File 
A, B
THIOCELLOBIOSE
C12 H22 O10 S
VDQIIPZYLPYPNM-QRZGKKJRSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.196 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 87.753α = 90.00
b = 99.068β = 90.00
c = 108.090γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement
MxCuBEdata collection
XSCALEdata scaling
XDSdata reduction
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-09-24
    Type: Initial release