Crystal structure of alpha-glucosyl transfer enzyme, XgtA at 1.72 angstrom resolution

Experimental Data Snapshot

  • Resolution: 1.72 Å
  • R-Value Free: 0.254 
  • R-Value Work: 0.218 
  • R-Value Observed: 0.220 

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This is version 1.3 of the entry. See complete history


Crystal structure of alpha-glucosyl transfer enzyme XgtA from Xanthomonas campestris WU-9701.

Watanabe, R.Arimura, Y.Ishii, Y.Kirimura, K.

(2020) Biochem Biophys Res Commun 526: 580-585

  • DOI: https://doi.org/10.1016/j.bbrc.2020.03.109
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The α-glucosyl transfer enzyme XgtA is a novel type α-Glucosidase (EC produced by Xanthomonas campestris WU-9701. One of the unique properties of XgtA is that it shows extremely high α-glucosylation activity toward alcoholic and phenolic -OH groups in compounds using maltose as an α-glucosyl donor and allows for the synthesis of various useful α-glucosides with high yields. XgtA shows no hydrolytic activity toward sucrose and no α-glucosylation activity toward saccharides to produce oligosaccharides. In this report, the crystal structure of XgtA was solved at 1.72 Å resolution. The crystal belonged to space group P22 1 2 1 , with unit-cell parameters a = 73.07, b = 83.48, and c = 180.79 Å. The β→α loop 4 of XgtA, which is proximal to the catalytic center, formed a unique structure that is not observed in XgtA homologs. Furthermore, XgtA was found to contain unique amino acid residues around its catalytic center. The unique structure of XgtA provides an insight into the mechanism for the regulation of substrate specificity in this enzyme.

  • Organizational Affiliation

    Department of Applied Chemistry, Faculty of Science and Engineering, Waseda University, 3-4-1 Ohkubo, Shinjuku-ku, Tokyo, 169-8555, Japan.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
544Xanthomonas campestrisMutation(s): 0 
Gene Names: xgtA
Find proteins for Q76LB0 (Xanthomonas campestris)
Explore Q76LB0 
Go to UniProtKB:  Q76LB0
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ76LB0
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.72 Å
  • R-Value Free: 0.254 
  • R-Value Work: 0.218 
  • R-Value Observed: 0.220 
  • Space Group: P 2 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 73.071α = 90
b = 83.478β = 90
c = 180.785γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
Aimlessdata scaling
PDB_EXTRACTdata extraction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2019-07-24
    Type: Initial release
  • Version 1.1: 2020-05-13
    Changes: Database references
  • Version 1.2: 2020-05-20
    Changes: Database references
  • Version 1.3: 2023-11-22
    Changes: Data collection, Database references, Refinement description