Inhibition of protein phosphatase 2A by okadaic acid induces translocation of nucleocytoplasmic O-GlcNAc transferase

Sitosari, Heriati and Morimoto, Ikkei and Weng, Yao and Zheng, Yilin and Fukuhara, Yoko and Ikegame, Mika and Okamura, Hirohiko (2023) Inhibition of protein phosphatase 2A by okadaic acid induces translocation of nucleocytoplasmic O-GlcNAc transferase. Biochemical and Biophysical Research Communications, 646. 50 – 55. ISSN 0006291X

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Abstract

Post-translational modification (PTM) is crucial for many biological events, such as the modulation of bone metabolism. Phosphorylation and O-GlcNAcylation are two examples of PTMs that can occur at the same site in the protein: serine and threonine residues. This phenomenon may cause crosstalk and possible interactions between the molecules involved. Protein phosphatase 2 A (PP2A) is widely expressed throughout the body and plays a major role in dephosphorylation. At the same location where PP2A acts, O-GlcNAc transferase (OGT) can introduce uridine diphosphate N-acetylglucosamine (UDP-GlcNAc) molecules and mediates O-GlcNAc modifications. To examine the effects of PP2A inhibition on OGT localization and expression, osteoblastic MC3T3-E1 cells were treated with Okadaic Acid (OA), a potent PP2A inhibitor. In the control cells, OGT was strictly localized in the nucleus. However, OGT was observed diffusely in the cytoplasm of the OA-treated cells. This change in localization from the nucleus to the cytoplasm resulted from an increase in mitochondrial OGT expression and translocation of the nucleocytoplasmic isoform. Furthermore, knockdown of PP2A catalytic subunit α isoform (PP2A Cα) significantly affected OGT expression (p < 0.05), and there was a correlation between PP2A Cα and OGT expression (r = 0.93). These results suggested a possible interaction between PP2A and OGT, which strengthens the notion of an interaction between phosphorylation and O-GlcNAcylation. © 2023 Elsevier Inc.

Item Type: Article
Additional Information: Cited by: 1
Uncontrolled Keywords: Acetylglucosamine; N-Acetylglucosaminyltransferases; Okadaic Acid; Protein Isoforms; Protein Phosphatase 2; Protein Processing, Post-Translational; isoenzyme; n acetylglucosamine; okadaic acid; phosphoprotein phosphatase 2A; uridine diphosphate n acetylglucosamine; isoprotein; n acetylglucosamine; n acetylglucosaminyltransferase; O-GlcNAc transferase; okadaic acid; phosphoprotein phosphatase 2; Article; catalysis; controlled study; cytoplasm; enzyme inhibition; MC3T3-E1 cell line; nucleocytoplasmic transport; protein degradation; protein expression; protein modification; protein phosphorylation; protein protein interaction; metabolism; protein processing
Subjects: R Medicine > RK Dentistry
Divisions: Faculty of Biology > Doctoral Program in Biology
Depositing User: Sri JUNANDI
Date Deposited: 05 Nov 2024 05:01
Last Modified: 05 Nov 2024 05:01
URI: https://ir.lib.ugm.ac.id/id/eprint/10897

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