Discovery of human Golgi β-galactosidase with no identified glycosidase using a QMC substrate design platform for exo-glycosidase

Kazuki Miura, Wataru Hakamata, Ayako Tanaka, Takako Hirano, Toshiyuki Nishio

研究成果: Article

3 引用 (Scopus)

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Post-translational modifications (PTMs) of proteins play important roles in the physiology of eukaryotes. In the PTMs, non-reversible glycosylations are classified as N-glycosylations and O-glycosylations, and are catalyzed by various glycosidases and glycosyltransferases. However, β-glycosidases are not known to play a role in N- and O-glycan processing, although both glycans provide partial structures as substrates for β-galactosidase and β-N-acetylglucosaminidase in the Golgi apparatus of human cells. We explored human Golgi β-galactosidase using fluorescent substrates based on a quinone methide cleavage (QMC) substrate design platform that was previously developed to image exo-type glycosidases in living cells. As a result, we discovered a novel Golgi β-galactosidase in human cells. It is possible to predict a novel and important function in glycan processing of this β-galactosidase, because various β-galactosyl linkages in N- and O-glycans exist in Golgi apparatus. In addition, these results show that the QMC platform is excellent for imaging exo-type glycosidases.

元の言語English
ページ(範囲)1369-1375
ページ数7
ジャーナルBioorganic and Medicinal Chemistry
24
発行部数6
DOI
出版物ステータスPublished - 2016 3 15
外部発表Yes

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ASJC Scopus subject areas

  • Biochemistry
  • Molecular Medicine
  • Molecular Biology
  • Pharmaceutical Science
  • Drug Discovery
  • Clinical Biochemistry
  • Organic Chemistry

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