Phosphorylation and glycosylation of nucleoporins - PubMed (original) (raw)
. 1999 Jul 1;367(1):51-60.
doi: 10.1006/abbi.1999.1237.
Affiliations
- PMID: 10375398
- DOI: 10.1006/abbi.1999.1237
Phosphorylation and glycosylation of nucleoporins
M W Miller et al. Arch Biochem Biophys. 1999.
Abstract
The nuclear pore complex mediates macromolecular transport between the nucleus and cytoplasm. Many nuclear pore components (nucleoporins) are modified by both phosphate and O-linked N-acetylglucosamine (O-GlcNAc). Among its many functions, protein phosphorylation plays essential roles in cell cycle progression. The role of O-GlcNAc addition is unknown. Here, levels of nucleoporin phosphorylation and glycosylation during cell cycle progression are examined. Whereas nuclear pore glycoproteins are phosphorylated in a cell-cycle-dependent manner, levels of O-GlcNAc remain constant. The major nucleoporin p62 can be phosphorylated in vitro by protein kinase A and glycogen synthase kinase (GSK)-3alpha but not by cyclin B/cdc2 or GSK-3beta. The consensus sites of these kinases resemble sites which can be glycosylated by O-GlcNAc transferase. These data are consistent with a model that O-GlcNAc limits nucleoporin hyperphosphorylation during M-phase and hastens the resumption of regulated nuclear transport at the completion of cell division.
Copyright 1999 Academic Press.
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