6LCL

TtGalA, alpha-galactosidase from Thermus thermophilus in complex with stachyose


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.20 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.153 
  • R-Value Observed: 0.157 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Crystal Structure of alpha-Galactosidase from Thermus thermophilus : Insight into Hexamer Assembly and Substrate Specificity.

Chen, S.C.Wu, S.P.Chang, Y.Y.Hwang, T.S.Lee, T.H.Hsu, C.H.

(2020) J Agric Food Chem 68: 6161-6169

  • DOI: https://doi.org/10.1021/acs.jafc.0c00871
  • Primary Citation of Related Structures:  
    6LCJ, 6LCK, 6LCL

  • PubMed Abstract: 

    α-Galactosidase catalyzes the hydrolysis of a terminal α-galactose residue in galacto-oligosaccharides and has potential in various industrial applications and food processing. We determined the crystal structures of α-galactosidase from the thermophilic microorganism Thermus thermophilus (TtGalA) and its complexes with pNPGal and stachyose. The monomer folds into an N-terminal domain, a catalytic (β/α) 8 barrel domain, and a C-terminal domain. The domain organization is similar to that of the other family of 36 α-galactosidases, but TtGalA presents a cagelike hexamer. Structural analysis shows that oligomerization may be a key factor for the thermal adaption of TtGalA. The structure of TtGalA complexed with stachyose reveals only the existence of one -1 subsite and one +1 subsite in the active site. Structural comparison of the stachyose-bound complexes of TtGalA and GsAgaA, a tetrameric enzyme with four subsites, suggests evolutionary divergence of substrate specificity within the GH36 family of α-galactosidases. To the best of our knowledge, the crystal structure of TtGalA is the first report of a quaternary structure as a hexameric assembly in the α-galactosidase family.


  • Organizational Affiliation

    Department of Agricultural Chemistry, National Taiwan University, Taipei 10617, Taiwan.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Alpha-galactosidaseA,
B [auth C],
C [auth E]
479Thermus thermophilus HB8Mutation(s): 0 
Gene Names: TTHB115
UniProt
Find proteins for Q53W51 (Thermus thermophilus (strain ATCC 27634 / DSM 579 / HB8))
Explore Q53W51 
Go to UniProtKB:  Q53W51
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ53W51
Sequence Annotations
Expand
  • Reference Sequence
Oligosaccharides

Help

Entity ID: 2
MoleculeChains Length2D Diagram Glycosylation3D Interactions
alpha-D-galactopyranose-(1-6)-alpha-D-galactopyranoseD [auth B],
E [auth D],
F
2N/A
Glycosylation Resources
GlyTouCan:  G72006FF
GlyCosmos:  G72006FF
GlyGen:  G72006FF
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.20 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.153 
  • R-Value Observed: 0.157 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 118.446α = 90
b = 205.01β = 90
c = 163.392γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling
PHENIXphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Ministry of Science and Technology (Taiwan)Taiwan108-2628-B-002-013
Ministry of Science and Technology (Taiwan)Taiwan108-2113-M-002-011

Revision History  (Full details and data files)

  • Version 1.0: 2020-09-30
    Type: Initial release
  • Version 1.1: 2024-03-27
    Changes: Data collection, Database references
  • Version 1.2: 2024-04-03
    Changes: Refinement description