3THC

Crystal structure of human beta-galactosidase in complex with galactose

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.192 

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This is version 1.2 of the entry. See complete history. 


Literature

Crystal structure of human beta-galactosidase: structural basis of Gm1 gangliosidosis and morquio B diseases

Ohto, U., Usui, K., Ochi, T., Yuki, K., Satow, Y., Shimizu, T.

(2012) J Biol Chem 287: 1801-1812

  • DOI: https://doi.org/10.1074/jbc.M111.293795
  • Primary Citation of Related Structures:  
    3THC, 3THD

  • PubMed Abstract: 

    • G(M1) gangliosidosis and Morquio B are autosomal recessive lysosomal storage diseases associated with a neurodegenerative disorder or dwarfism and skeletal abnormalities, respectively. These diseases are caused by deficiencies in the lysosomal enzyme β-d-galactosidase (β-Gal), which lead to accumulations of the β-Gal substrates, G(M1) ganglioside, and keratan sulfate ...

    G(M1) gangliosidosis and Morquio B are autosomal recessive lysosomal storage diseases associated with a neurodegenerative disorder or dwarfism and skeletal abnormalities, respectively. These diseases are caused by deficiencies in the lysosomal enzyme β-d-galactosidase (β-Gal), which lead to accumulations of the β-Gal substrates, G(M1) ganglioside, and keratan sulfate. β-Gal is an exoglycosidase that catalyzes the hydrolysis of terminal β-linked galactose residues. This study shows the crystal structures of human β-Gal in complex with its catalytic product galactose or with its inhibitor 1-deoxygalactonojirimycin. Human β-Gal is composed of a catalytic TIM barrel domain followed by β-domain 1 and β-domain 2. To gain structural insight into the molecular defects of β-Gal in the above diseases, the disease-causing mutations were mapped onto the three-dimensional structure. Finally, the possible causes of the diseases are discussed.

    Organizational Affiliation: 

    From the Graduate School of Pharmaceutical Sciences, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.



Macromolecules
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(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Beta-galactosidaseA, B, C, D654Homo sapiensMutation(s): 0 
Gene Names: GLB1, ELNR1
EC: 3.2.1.23
UniProt & NIH Common Fund Data Resources
Find proteins for P16278 (Homo sapiens)
Explore P16278 
Go to UniProtKB:  P16278
PHAROS:  P16278
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP16278
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAG
Query on NAG
Download Ideal Coordinates CCD File 
AA [auth C],
BA [auth C],
E [auth A],
F [auth A],
G [auth A],
AA [auth C],
BA [auth C],
E [auth A],
F [auth A],
G [auth A],
H [auth A],
IA [auth D],
JA [auth D],
KA [auth D],
LA [auth D],
O [auth B],
P [auth B],
Q [auth B],
R [auth B],
Y [auth C],
Z [auth C]
2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N		 Ligand Interaction
GAL
Query on GAL
Download Ideal Coordinates CCD File 
DA [auth C],
J [auth A],
NA [auth D],
T [auth B]		beta-D-galactopyranose
C6 H12 O6
WQZGKKKJIJFFOK-FPRJBGLDSA-N		 Ligand Interaction
SO4
Query on SO4
Download Ideal Coordinates CCD File 
EA [auth C],
FA [auth C],
K [auth A],
L [auth A],
OA [auth D],
EA [auth C],
FA [auth C],
K [auth A],
L [auth A],
OA [auth D],
PA [auth D],
U [auth B],
V [auth B]
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L		 Ligand Interaction
EDO
Query on EDO
Download Ideal Coordinates CCD File 
GA [auth C],
HA [auth C],
M [auth A],
N [auth A],
QA [auth D],
GA [auth C],
HA [auth C],
M [auth A],
N [auth A],
QA [auth D],
RA [auth D],
W [auth B],
X [auth B]
1,2-ETHANEDIOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N		 Ligand Interaction
CL
Query on CL
Download Ideal Coordinates CCD File 
CA [auth C],
I [auth A],
MA [auth D],
S [auth B]		CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.192 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 94.799α = 90
b = 116.104β = 92.21
c = 140.326γ = 90
Software Package:
Software NamePurpose
MOLREPphasing
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-12-07
    Type: Initial release
  • Version 1.1: 2013-07-10
    Changes: Database references
  • Version 1.2: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Derived calculations, Structure summary