DescriptionO-linked N-acetylglucosamine (O-GlcNAc) is a posttranslational modification characterized by the attachment of N-acetylglucosamine to specific serine or threonine residues. Unlike other protein glycosylations, O-GlcNAc modifications occur within the nucleus and cytoplasm. They are found on many cellular proteins, including nuclear pore, oncogene, cytoskeletal, heat shock, viral and transcription regulatory proteins. O-GlcNAc glycosylations are thought to obscure phosphorylation sites, counteracting phosphorylation-dependent signaling pathways and protein interactions.
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