Efficient method for the elongation of the N-acetylglucosamine unit by combined use of chitinase and β-galactosidase

Shin ichiro Shoda, Masaya Fujita, Chakapan Lohavisavapanichi, Yoshinori Misawa, Koushin Ushizaki, Yukiko Tawata, Mao Kuriyama, Michinari Kohri, Hideyuki Kuwata, Takeshi Watanabe

Research output: Contribution to journalArticlepeer-review

41 Citations (Scopus)


A novel strategy for the regio- and stereoselective synthesis by two enzymatic steps of oligosaccharides having an N-acetylglucosamine unit at the nonreducing end was developed. The first step involves a chitinase-catalyzed highly selective β-N-acetyllactosamination of an oligosaccharide acceptor with a 4,5-dihydrooxazole derivative of N-acetyllactosamine as the glycosyl donor. The usage of a transition-state-analogue substrate for the chitinase under basic conditions allows the reaction to proceed only in the synthetic direction while suppressing hydrolysis of the product in aqueous media. Several chitinase mutants also catalyzed the glycosylation efficiently under neutral conditions, The second step is a regioselective cleavage of the glycosidic bond between the terminal galactose unit and the adjacent N-acetylglucosamine unit by the action of a β- galactosidase. This constitutes a very useful method to add an N-acetylglucosamine unit to the nonreducing end of chito- and cello-oligosaccharide derivatives in a regio- and stereoselective manner.

Original languageEnglish
Pages (from-to)3919-3936
Number of pages18
JournalHelvetica Chimica Acta
Issue number11
Publication statusPublished - 2002

ASJC Scopus subject areas

  • Catalysis
  • Biochemistry
  • Drug Discovery
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry


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