Pyruvylated beta-D-galactosidase from Bacillus sp. HMA207, apo form

Experimental Data Snapshot

  • Resolution: 2.50 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.219 
  • R-Value Observed: 0.222 

Starting Model: experimental
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Identification and characterization of a novel beta-D-galactosidase that releases pyruvylated galactose.

Higuchi, Y.Matsufuji, H.Tanuma, M.Arakawa, T.Mori, K.Yamada, C.Shofia, R.Matsunaga, E.Tashiro, K.Fushinobu, S.Takegawa, K.

(2018) Sci Rep 8: 12013-12013

  • DOI: https://doi.org/10.1038/s41598-018-30508-4
  • Primary Citation of Related Structures:  
    5YHS, 5YIF

  • PubMed Abstract: 

    Pyruvyl modification of oligosaccharides is widely seen in both prokaryotes and eukaryotes. Although the biosynthetic mechanisms of pyruvylation have been investigated, enzymes that metabolize and degrade pyruvylated oligosaccharides are not well known. Here, we searched for a pyruvylated galactose (PvGal)-releasing enzyme by screening soil samples. We identified a Bacillus strain, as confirmed by the 16S ribosomal RNA gene analysis, that exhibited PvGal-ase activity toward p-nitrophenyl-β-D-pyruvylated galactopyranose (pNP-β-D-PvGal). Draft genome sequencing of this strain, named HMA207, identified three candidate genes encoding potential PvGal-ases, among which only the recombinant protein encoded by ORF1119 exhibited PvGal-ase activity. Although ORF1119 protein displayed broad substrate specificity for pNP sugars, pNP-β-D-PvGal was the most favorable substrate. The optimum pH for the ORF1119 PvGal-ase was determined as 7.5. A BLAST search suggested that ORF1119 homologs exist widely in bacteria. Among two homologs tested, BglC from Clostridium but not BglH from Bacillus showed PvGal-ase activity. Crystal structural analysis together with point mutation analysis revealed crucial amino acids for PvGal-ase activity. Moreover, ORF1119 protein catalyzed the hydrolysis of PvGal from galactomannan of Schizosaccharomyces pombe, suggesting that natural polysaccharides might be substrates of the PvGal-ase. This novel PvGal-catalyzing enzyme might be useful for glycoengineering projects to produce new oligosaccharide structures.

  • Organizational Affiliation

    Department of Bioscience and Biotechnology, Faculty of Agriculture, Kyushu University, 6-10-1 Hakozaki, Fukuoka, 812-8581, Japan.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Pyruvylated beta-D-galactosidase
A, B
475Bacillus sp. (in: firmicutes)Mutation(s): 0 
Gene Names: ORF1119
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.50 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.219 
  • R-Value Observed: 0.222 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 113.997α = 90
b = 113.997β = 90
c = 148.678γ = 120
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2018-08-29
    Type: Initial release
  • Version 1.1: 2023-11-22
    Changes: Data collection, Database references, Refinement description