PKM2

Pyruvate kinase M2 (PKM2) is a glycolytic enzyme that catalyzes the final rate-limiting step of glycolysis, converting phosphoenolpyruvate to pyruvate and ATP, and it is highly expressed in proliferating cells and many tumor types[1]. PKM2 contributes to metabolic reprogramming by maintaining a relatively low catalytic state that redirects glucose-derived intermediates from energy production toward anabolic biosynthesis required for rapid cell growth[1][2]. Mechanistically, PKM2 functions not only as a metabolic enzyme but also as a regulator of gene expression and signaling, with nuclear PKM2 supporting transcriptional programs associated with proliferation, tumor growth, and metabolic adaptation[2][3]. In disease contexts, PKM2 expression has been closely associated with cancer metabolism, embryonic development, tissue repair, and multiple models of tumor progression[4][5]. Compared with the related isoform PKM1, which forms constitutively active tetramers with high catalytic activity, PKM2 exists in multiple oligomeric states and exhibits distinct regulatory properties that enable dynamic control of glycolytic flux and cellular biosynthetic pathways[1][6]. This functional distinction is considered a key determinant of the metabolic phenotype observed in proliferating cells and tumors[4][6]. For experimental applications, PKM2 has become a widely studied therapeutic target because modulation of its oligomeric state can alter both metabolic and non-metabolic functions[2]. Small-molecule activators that promote PKM2 tetramer formation, including TEPP-46, have been used extensively to investigate the relationship between PKM2 activity, glycolytic regulation, and disease-associated cellular phenotypes[2][7].