4PTX

Halothermothrix orenii beta-glucosidase A, glucose complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.225 
  • R-Value Work: 0.183 
  • R-Value Observed: 0.184 

wwPDB Validation 3D Report Full Report


This is version 1.1 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:  
    4PTV, 4PTW, 4PTX

  • 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 utilization ...

    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:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Glycoside hydrolase family 1AB452Halothermothrix orenii H 168Mutation(s): 0 
Gene Names: bglaHore_15280
EC: 3.2.1.21
Find proteins for B8CYA8 (Halothermothrix orenii (strain H 168 / OCM 544 / DSM 9562))
Explore B8CYA8 
Go to UniProtKB:  B8CYA8
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
BGC
Query on BGC

Download CCD File 
A, B
beta-D-glucopyranose
C6 H12 O6
WQZGKKKJIJFFOK-VFUOTHLCSA-N
 Ligand Interaction
CAC
Query on CAC

Download CCD File 
A, B
CACODYLATE ION
C2 H6 As O2
OGGXGZAMXPVRFZ-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.225 
  • R-Value Work: 0.183 
  • R-Value Observed: 0.184 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 89.446α = 90
b = 97.878β = 90
c = 109.875γ = 90
Software Package:
Software NamePurpose
MxCuBEdata collection
PHASERphasing
PHENIXrefinement
XDSdata reduction
XSCALEdata scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-09-24
    Type: Initial release
  • Version 1.1: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Database references, Derived calculations, Structure summary