1UG9

Crystal Structure of Glucodextranase from Arthrobacter globiformis I42


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.189 
  • R-Value Observed: 0.190 

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This is version 1.2 of the entry. See complete history


Literature

Structural insights into substrate specificity and function of glucodextranase

Mizuno, M.Tonozuka, T.Suzuki, S.Uotsu-Tomita, R.Kamitori, S.Nishikawa, A.Sakano, Y.

(2004) J Biol Chem 279: 10575-10583

  • DOI: 10.1074/jbc.M310771200
  • Primary Citation of Related Structures:  
    1UG9, 1ULV

  • PubMed Abstract: 
  • A glucodextranase (iGDase) from Arthrobacter globiformis I42 hydrolyzes alpha-1,6-glucosidic linkages of dextran from the non-reducing end to produce beta-D-glucose via an inverting reaction mechanism and classified into the glycoside hydrolase family 15 (GH15) ...

    A glucodextranase (iGDase) from Arthrobacter globiformis I42 hydrolyzes alpha-1,6-glucosidic linkages of dextran from the non-reducing end to produce beta-D-glucose via an inverting reaction mechanism and classified into the glycoside hydrolase family 15 (GH15). Here we cloned the iGDase gene and determined the crystal structures of iGDase of the unliganded form and the complex with acarbose at 2.42-A resolution. The structure of iGDase is composed of four domains N, A, B, and C. Domain A forms an (alpha/alpha)(6)-barrel structure and domain N consists of 17 antiparallel beta-strands, and both domains are conserved in bacterial glucoamylases (GAs) and appear to be mainly concerned with catalytic activity. The structure of iGDase complexed with acarbose revealed that the positions and orientations of the residues at subsites -1 and +1 are nearly identical between iGDase and GA; however, the residues corresponding to subsite 3, which form the entrance of the substrate binding pocket, and the position of the open space and constriction of iGDase are different from those of GAs. On the other hand, domains B and C are not found in the bacterial GAs. The primary structure of domain C is homologous with a surface layer homology domain of pullulanases, and the three-dimensional structure of domain C resembles the carbohydrate-binding domain of some glycohydrolases.


    Organizational Affiliation

    Department of Applied Biological Science, Tokyo University of Agriculture and Technology, Fuchu, Tokyo 183-8509, Japan.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
glucodextranaseA1,020Arthrobacter globiformisMutation(s): 0 
Gene Names: g1d
EC: 3.2.1.70 (PDB Primary Data), 3.2.1.3 (UniProt)
UniProt
Find proteins for Q9LBQ9 (Arthrobacter globiformis)
Explore Q9LBQ9 
Go to UniProtKB:  Q9LBQ9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9LBQ9
Protein Feature View
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.189 
  • R-Value Observed: 0.190 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 199.86α = 90
b = 88.535β = 113.08
c = 80.781γ = 90
Software Package:
Software NamePurpose
CNSrefinement
MOSFLMdata reduction
CCP4data scaling
CNSphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-12-09
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Non-polymer description, Version format compliance