Screening Kinase-Dependent Phosphorylation of Key Metabolic Reprogramming Regulators

Area of Science:

• Biochemistry
• Molecular Biology
• Cancer Research

Background:

• Aerobic glycolysis fuels cancer cell proliferation by providing energy and building blocks.
• Pyruvate kinase M2 (PKM2) is a key enzyme in glycolysis, regulating ATP production and biosynthesis.
• PKM2 activity is modulated by post-translational modifications, including phosphorylation, impacting cell growth.

Purpose of the Study:

• To describe and validate an in vitro kinase assay for assessing PKM2 phosphorylation.
• To investigate the phosphorylation of PKM2 by c-Jun N-terminal kinase (JNK).
• To provide a robust method for quantifying kinase-substrate interactions.

Main Methods:

• Development of an in vitro kinase assay to measure PKM2 phosphorylation.
• Utilizing the assay to assess the phosphorylation of PKM2 by JNK.
• Comparison with phospho-specific antibody methods, highlighting the advantages of the in vitro assay.

Main Results:

• The in vitro kinase assay successfully measured PKM2 phosphorylation by JNK.
• The assay provides robust quantitation of phosphorylation events.
• The protocol is adaptable for studying other kinase-substrate interactions.

Conclusions:

• The described in vitro kinase assay is a valuable tool for studying PKM2 regulation.
• This method facilitates the investigation of JNK's role in PKM2 phosphorylation.
• The assay's adaptability makes it broadly applicable for kinase activity studies in biological research.