Journal article
Glucose mediates the translocation of NeuroD1 by O-linked glycosylation
The Journal of biological chemistry, Vol.282(21), pp.15589-15596
05/25/2007
DOI: 10.1074/jbc.M701762200
PMCID: PMC2096475
PMID: 17403669
Abstract
O-Linked GlcNAc modification of nuclear and cytosolic proteins has been shown to regulate the function of many cellular proteins. Increased O-linked glycosylation, observed under chronic hyperglycemia conditions, has been implicated in the pathogenesis of diabetes. However, the exact role of O-GlcNAc modification in regulating glucose homeostasis remains to be established. We report here that the subcellular localization of the pancreatic beta cell-specific transcription factor NeuroD1 is regulated by O-linked glycosylation in the mouse insulinoma cell line MIN6. Under low glucose conditions, NeuroD1 is mainly in the cytosol. However, treatment of MIN6 cells with high glucose results in O-linked GlcNAc modification of NeuroD1 and its subsequent translocation into the nucleus. Consistent with these data, treatment of MIN6 cells with O-(2-acetamido-2-deoxy-D-glucopyranosylidene)-amino N-phenylcarbamate, an inhibitor of O- GlcNAcase, causes NeuroD1 localization to the nucleus and induction of insulin gene expression even on low glucose. Furthermore, we demonstrate that NeuroD1 interacts with the O- GlcNAc transferase, OGT only at high concentrations of glucose and depletion of OGT by using small interfering RNA oligos interferes with the nuclear localization of NeuroD1 on high glucose. On low glucose NeuroD1 interacts with the O-GlcNAcase and becomes deglycosylated, which is likely to be important for export of NeuroD1 into cytosol in the presence of low glucose. In summary, the presented data suggest that glucose regulates the subcellular localization of NeuroD1 in pancreatic beta cells via O-linked GlcNAc modification of NeuroD1 by OGT.
Details
- Title: Subtitle
- Glucose mediates the translocation of NeuroD1 by O-linked glycosylation
- Creators
- Sreenath S. Andrali - University of KentuckyQingwen Qian - University of KentuckySabire Ozcan - University of Kentucky
- Resource Type
- Journal article
- Publication Details
- The Journal of biological chemistry, Vol.282(21), pp.15589-15596
- DOI
- 10.1074/jbc.M701762200
- PMID
- 17403669
- PMCID
- PMC2096475
- NLM abbreviation
- J Biol Chem
- ISSN
- 0021-9258
- eISSN
- 1083-351X
- Publisher
- Amer Soc Biochemistry Molecular Biology Inc
- Number of pages
- 8
- Grant note
- P20RR020171 / NATIONAL CENTER FOR RESEARCH RESOURCES; United States Department of Health & Human Services; National Institutes of Health (NIH) - USA; NIH National Center for Research Resources (NCRR) P20 RR020171; P20RR20171 / NCRR NIH HHS; United States Department of Health & Human Services; National Institutes of Health (NIH) - USA; NIH National Center for Research Resources (NCRR) R01DK067581 / NATIONAL INSTITUTE OF DIABETES AND DIGESTIVE AND KIDNEY DISEASES; United States Department of Health & Human Services; National Institutes of Health (NIH) - USA; NIH National Institute of Diabetes & Digestive & Kidney Diseases (NIDDK) R21 DK065730-02; R01 DK067581-02; R01 DK067581; R21 DK065730 / NIDDK NIH HHS; United States Department of Health & Human Services; National Institutes of Health (NIH) - USA; NIH National Institute of Diabetes & Digestive & Kidney Diseases (NIDDK)
- Language
- English
- Date published
- 05/25/2007
- Academic Unit
- Anatomy and Cell Biology
- Record Identifier
- 9984420847002771
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