Biochemical and crystallographic characterization of a glucansucrase from Lactobacillus reuteri 180

Tjaard Pijning, Andreja Vujicic-Zagar, Slavko Kralj, Wieger Eeuwema, Lubbert Dijkhuizen, Bauke W. Dijkstra*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

Glucansucrases are large extracellular transglycosidases secreted by lactic acid bacteria. Using sucrose as a substrate they synthesize high molecular mass alpha-glucans or, in the presence of suitable acceptor molecules, low molecular mass oligosaccharides. Although about 60 glucansucrases have been classified in glycoside hydrolase family GH70, no three-dimensional structure has been reported for any. With the aim of solving the first structure of a GH70 glucansucrase, purification and crystallization experiments were performed with a fully active, 117 kDa N-terminally truncated fragment of glucansucrase GTF180 from Lactobacillus reuteri 180 (residues 742-1772). Crystallization experiments yielded crystals that belong to two different triclinic crystal forms (space group P1) and one orthorhombic crystal form (space group P2(1)2(1)2(1)). Native data sets for both triclinic and the orthorhombic crystals were collected at 1.7 and 2.0 angstrom resolution, respectively. Enzyme activity assays, pH and temperature optima show comparable values for both the full-length and the N-terminally truncated GTF180.

Original languageEnglish
Pages (from-to)12-17
Number of pages6
JournalBiocatalysis and Biotransformation
Volume26
Issue number1-2
DOIs
Publication statusPublished - 2008

Keywords

  • lactic acid bacteria
  • glucansucrase
  • crystallization
  • LACTIC-ACID BACTERIA
  • ALPHA-AMYLASE FAMILY
  • STREPTOCOCCUS-MUTANS
  • GLUCAN
  • EXOPOLYSACCHARIDES
  • ENZYMES
  • GLUCOSYLTRANSFERASES
  • SEQUENCE
  • STRAINS

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