ERK1/2 regulates SIRT2 deacetylase activity.

Area of Science:

• Biochemistry
• Molecular Biology
• Cell Signaling

Background:

• Sirtuin 2 (SIRT2) is an NAD-dependent protein deacetylase involved in various cellular processes.
• Post-translational modifications, including phosphorylation, can modulate SIRT2 function.
• The specific molecular mechanisms linking SIRT2 and extracellular signal-regulated kinase (ERK)1/2 signaling remain largely unelucidated.

Purpose of the Study:

• To investigate the potential regulation of SIRT2 by ERK1/2 signaling.
• To determine how ERK1/2 activation impacts SIRT2 protein levels, stability, and enzymatic activity.

Main Methods:

• Over-expression of constitutively active MEK to activate ERK.
• Treatment with U0126, a mitogen-activated kinase kinase inhibitor.
• Co-immunoprecipitation assays to assess protein-protein interactions.
• Measurement of SIRT2 deacetylase activity.

Main Results:

• ERK activation led to increased SIRT2 protein levels and enhanced stability.
• Inhibition of ERK signaling reduced SIRT2 protein levels.
• ERK1/2 was found to interact with SIRT2 both exogenously and endogenously.
• SIRT2 deacetylase activity was significantly upregulated in an ERK1/2-dependent manner.

Conclusions:

• ERK1/2 signaling plays a crucial role in regulating SIRT2.
• ERK1/2 increases SIRT2 protein levels, enhances its stability, and upregulates its deacetylase activity.
• This study uncovers a novel signaling pathway controlling SIRT2 function, with potential implications for cellular processes regulated by SIRT2.