Dynamic O-glycosylation of nuclear and cytosolic proteins: Further characterization of the nucleocytoplasmic β-N-acetylglucosaminidase, O-GlcNAcase

Lance Wells, Yuan Gao, James A. Mahoney, Keith Vosseller, Antony Rosen, Gerald W. Hart

Research output: Contribution to journalArticle

Abstract

β-O-linked N-acetylglucosamine (O-GlcNAc) is an abundant and dynamic post-translational modification implicated in protein regulation that appears to be functionally more similar to phosphorylation than to classical glycosylation. There are nucleocytoplasmic enzymes for the attachment and removal of O-GlcNAc. Here, we further characterize the recently cloned β-N-acetylglucosaminidase, O-GlcNAcase. Both recombinant and purified endogenous O-GlcNAcase rapidly release free GlcNAc from O-GlcNAc-modified peptide substrates. The recombinant enzyme functions as a monomer and has kinetic parameters (Km = 1.1 mM for paranitrophenyl-GlcNAc, kcat = 1 s-1) that are similar to those of lysosomal hexosaminidases. The endogenous O-GlcNAcase appears to be in a complex with other proteins and is predominantly localized to the cytosol. Overexpression of the enzyme in living cells results in decreased O-GlcNAc modification of nucleocytoplasmic proteins. Finally, we show that the enzyme is a substrate for caspase-3 but, suprisingly, the cleavage has no effect on in vitro O-GlcNAcase activity. These studies support the identification of this protein as an O-GlcNAcase and identify important interactions and modifications that may regulate the enzyme and O-GlcNAc cycling.

Original languageEnglish (US)
Pages (from-to)1755-1761
Number of pages7
JournalJournal of Biological Chemistry
Volume277
Issue number3
DOIs
StatePublished - Jan 18 2002

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Fingerprint Dive into the research topics of 'Dynamic O-glycosylation of nuclear and cytosolic proteins: Further characterization of the nucleocytoplasmic β-N-acetylglucosaminidase, O-GlcNAcase'. Together they form a unique fingerprint.

  • Cite this