Crystal structure of Alpha-glucosidase in complex with maltotetraose

Experimental Data Snapshot

  • Resolution: 1.55 Å
  • R-Value Free: 0.191 
  • R-Value Work: 0.172 
  • R-Value Observed: 0.173 

Starting Model: experimental
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Function and structure of GH13_31 alpha-glucosidase with high alpha-(1→4)-glucosidic linkage specificity and transglucosylation activity.

Auiewiriyanukul, W.Saburi, W.Kato, K.Yao, M.Mori, H.

(2018) FEBS Lett 592: 2268-2281

  • DOI: https://doi.org/10.1002/1873-3468.13126
  • Primary Citation of Related Structures:  
    5ZCB, 5ZCC, 5ZCD, 5ZCE

  • PubMed Abstract: 

    α-Glucosidase hydrolyzes α-glucosides and transfers α-glucosyl residues to an acceptor through transglucosylation. In this study, GH13_31 α-glucosidase BspAG13_31A with high transglucosylation activity is reported in Bacillus sp. AHU2216 and biochemically and structurally characterized. This enzyme is specific to α-(1→4)-glucosidic linkage as substrates and transglucosylation products. Maltose is the most preferred substrate. Crystal structures of BspAG13_31A wild-type for the substrate-free form and inactive acid/base mutant E256Q in complexes with maltooligosaccharides were solved at 1.6-2.5 Å resolution. BspAG13_31A has a catalytic domain folded by an (β/α) 8 -barrel. In subsite +1, Ala200 and His203 on β→α loop 4 and Asn258 on β→α loop 5 are involved in the recognition of maltooligosaccharides. Structural basis for specificity of GH13_31 enzymes to α-(1→4)-glucosidic linkage is first described.

  • Organizational Affiliation

    Research Faculty of Agriculture, Hokkaido University, Sapporo, Japan.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Alpha-glucosidase555Bacillus sp. (in: firmicutes)Mutation(s): 0 
Find proteins for A0A2Z5WH92 (Bacillus sp)
Explore A0A2Z5WH92 
Go to UniProtKB:  A0A2Z5WH92
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A2Z5WH92
Sequence Annotations
  • Reference Sequence


Entity ID: 2
MoleculeChains Length2D Diagram Glycosylation3D Interactions
Glycosylation Resources
GlyTouCan:  G87171PZ
GlyCosmos:  G87171PZ
GlyGen:  G87171PZ
Biologically Interesting Molecules (External Reference) 1 Unique
Experimental Data & Validation

Experimental Data

  • Resolution: 1.55 Å
  • R-Value Free: 0.191 
  • R-Value Work: 0.172 
  • R-Value Observed: 0.173 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 54.989α = 90
b = 84.549β = 90
c = 128.715γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XDSdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2018-12-26
    Type: Initial release
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Derived calculations, Non-polymer description, Structure summary
  • Version 2.1: 2023-11-22
    Changes: Data collection, Database references, Refinement description, Structure summary