3OGS

Complex structure of beta-galactosidase from Trichoderma reesei with IPTG


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.200 
  • R-Value Work: 0.145 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Crystal structures of Trichoderma reesei beta-galactosidase reveal conformational changes in the active site

Maksimainen, M.Hakulinen, N.Kallio, J.M.Timoharju, T.Turunen, O.Rouvinen, J.

(2011) J.Struct.Biol. 174: 156-163

  • DOI: 10.1016/j.jsb.2010.11.024
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • We have determined the crystal structure of Trichoderma reesei (Hypocrea jecorina) β-galactosidase (Tr-β-gal) at a 1.2Å resolution and its complex structures with galactose, IPTG and PETG at 1.5, 1.75 and 1.4Å resolutions, respectively. Tr-β-gal is a ...

    We have determined the crystal structure of Trichoderma reesei (Hypocrea jecorina) β-galactosidase (Tr-β-gal) at a 1.2Å resolution and its complex structures with galactose, IPTG and PETG at 1.5, 1.75 and 1.4Å resolutions, respectively. Tr-β-gal is a potential enzyme for lactose hydrolysis in the dairy industry and belongs to family 35 of the glycoside hydrolases (GH-35). The high resolution crystal structures of this six-domain enzyme revealed interesting features about the structure of Tr-β-gal. We discovered conformational changes in the two loop regions in the active site, implicating a conformational selection-mechanism for the enzyme. In addition, the Glu200, an acid/base catalyst showed two different conformations which undoubtedly affect the pK(a) value of this residue and the catalytic mechanism. The electron density showed extensive glycosylation, suggesting a structure stabilizing role for glycans. The longest glycan showed an electron density that extends to the eighth monosaccharide unit in the extended chain. The Tr-β-gal structure also showed a well-ordered structure for a unique octaserine motif on the surface loop of the fifth domain.


    Organizational Affiliation

    Department of Chemistry, University of Eastern Finland, P.O. Box 111, FIN-80101 Joensuu, Finland.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Beta-galactosidase
A
1003Hypocrea jecorinaMutation(s): 0 
Gene Names: bga1
EC: 3.2.1.23
Find proteins for Q70SY0 (Hypocrea jecorina)
Go to UniProtKB:  Q70SY0
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MAN
Query on MAN

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

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Download CCD File 
A
BETA-D-MANNOSE
C6 H12 O6
WQZGKKKJIJFFOK-RWOPYEJCSA-N
 Ligand Interaction
GLC
Query on GLC

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Download CCD File 
A
ALPHA-D-GLUCOSE
C6 H12 O6
WQZGKKKJIJFFOK-DVKNGEFBSA-N
 Ligand Interaction
IPT
Query on IPT

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Download CCD File 
A
ISOPROPYL-1-BETA-D-THIOGALACTOSIDE
1-(ISOPROPYLTHIO)-BETA-GALACTOPYRANSIDE
C9 H18 O5 S
BPHPUYQFMNQIOC-NXRLNHOXSA-N
 Ligand Interaction
NAG
Query on NAG

Download SDF File 
Download CCD File 
A
N-ACETYL-D-GLUCOSAMINE
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.200 
  • R-Value Work: 0.145 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 69.500α = 108.50
b = 70.300β = 97.80
c = 82.400γ = 114.40
Software Package:
Software NamePurpose
XDSdata reduction
DNAdata collection
MOLREPphasing
REFMACrefinement
XSCALEdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-03-16
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance