1FHL

CRYSTAL STRUCTURE OF BETA-1,4-GALACTANASE FROM ASPERGILLUS ACULEATUS AT 293K


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.166 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Aspergillus aculeatus beta-1,4-Galactanase: Substrate Recognition and Relations to Other Glycoside Hydrolases in Clan GH-A

Ryttersgaard, C.Leggio, L.L.Coutinho, P.M.Henrissat, B.Larsen, S.

(2002) Biochemistry 41: 15135-15143

  • Primary Citation of Related Structures:  1FOB

  • PubMed Abstract: 
  • The three-dimensional structure of Aspergillus aculeatus beta-1,4-galactanase (AAGAL), an enzyme involved in pectin degradation, has been determined by multiple isomorphous replacement to 2.3 and 1.8 A resolution at 293 and 100 K, respectively. It re ...

    The three-dimensional structure of Aspergillus aculeatus beta-1,4-galactanase (AAGAL), an enzyme involved in pectin degradation, has been determined by multiple isomorphous replacement to 2.3 and 1.8 A resolution at 293 and 100 K, respectively. It represents the first known structure for a polysaccharidase with this specificity and for a member of glycoside hydrolase family 53 (GH-53). The enzyme folds into a (beta/alpha)(8) barrel with the active site cleft located at the C-terminal side of the barrel consistent with the classification of GH-53 in clan GH-A, a superfamily of enzymes with common fold and catalytic machinery but diverse specificities. Putative substrate-enzyme interactions were elucidated by modeling of beta-1,4-linked galactobioses into the possible substrate binding subsites. The structure and modeling studies identified five potential subsites for the binding of galactans, of which one is a pocket suited for accommodating the arabinan side chain in arabinogalactan, one of the natural substrates. A comparison with the substrate binding grooves of other Clan GH-A enzymes suggests that shape complementarity is crucial in determining the specificity of polysaccharidases.


    Related Citations: 
    • Crystallization and Preliminary X-ray Studies of beta-1,4-galactanase from Aspergillus aculeatus
      Ryttersgaard, C.,Poulsen, J.,Christgau, S.,Sandal, T.,Dalboge, H.,Larsen, S.
      (1999) Acta Crystallogr.,Sect.D 55: 929


    Organizational Affiliation

    Centre for Crystallographic Studies, Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
BETA-1,4-GALACTANASE
A
334Aspergillus aculeatusGene Names: gal1
EC: 3.2.1.89
Find proteins for P48842 (Aspergillus aculeatus)
Go to UniProtKB:  P48842
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.166 
  • Space Group: I 2 2 2
Unit Cell:
Length (Å)Angle (°)
a = 60.420α = 90.00
b = 88.940β = 90.00
c = 129.080γ = 90.00
Software Package:
Software NamePurpose
TRUNCATEdata reduction
CCP4data scaling
SHARPphasing
X-PLORrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-06-03
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-10-04
    Type: Refinement description