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- Title
Role of the SIK2-p35-PJA2 complex in pancreatic β-cell functional compensation.
- Authors
Sakamaki, Jun-Ichi; Fu, Accalia; Reeks, Courtney; Baird, Stephen; Depatie, Chantal; Al Azzabi, Mufida; Bardeesy, Nabeel; Gingras, Anne-Claude; Yee, Siu-Pok; Screaton, Robert A.
- Abstract
Energy sensing by the AMP-activated protein kinase (AMPK) is of fundamental importance in cell biology. In the pancreatic β-cell, AMPK is a central regulator of insulin secretion. The capacity of the β-cell to increase insulin output is a critical compensatory mechanism in prediabetes, yet its molecular underpinnings are unclear. Here we delineate a complex consisting of the AMPK-related kinase SIK2, the CDK5 activator CDK5R1 (also known as p35) and the E3 ligase PJA2 essential for β-cell functional compensation. Following glucose stimulation, SIK2 phosphorylates p35 at Ser 91, to trigger its ubiquitylation by PJA2 and promote insulin secretion. Furthermore, SIK2 accumulates in β-cells in models of metabolic syndrome to permit compensatory secretion; in contrast, β-cell knockout of SIK2 leads to accumulation of p35 and impaired secretion. This work demonstrates that the SIK2-p35-PJA2 complex is essential for glucose homeostasis and provides a link between p35-CDK5 and the AMPK family in excitable cells.
- Subjects
ADENOSINE monophosphate; CYTOLOGY; INSULIN; GLUCOSE; CELL physiology
- Publication
Nature Cell Biology, 2014, Vol 16, Issue 3, p234
- ISSN
1465-7392
- Publication type
Article
- DOI
10.1038/ncb2919