PUMA (p53 upregulated modulator of apoptosis) is a family of eukaryotic proteins that are a target for activation by p53. The proteins contain BH3 domains and are induced in cells after p53 activation. They bind to Bcl-2, localise to the mitochondria to induce cytochrome c release, and activate the rapid induction of apoptosis [1].

1: PUMA, a novel proapoptotic gene, is induced by p53. Nakano K, Vousden KH; Mol Cell. 2001;7:683-694. PMID:11463392