Death-associated protein 3 (DAP3)

Death-associated protein 3 (DAP3) is a highly conserved mitochondrial matrix protein that functions as an essential component of the small subunit of the mitochondrial ribosome[1][2][3][4][5]. It is required for the synthesis of mitochondrial-encoded proteins necessary for respiratory chain function and energy production[2][3][4]. DAP3 also serves as a positive regulator of apoptosis, mediating cell death downstream from death receptors (such as TNF, Fas ligand, and TRAIL) via interaction with FADD and caspase 8[1][4]. Beyond its canonical mitochondrial roles, DAP3 participates in RNA splicing regulation as a widespread RNA-binding protein, modifying the splicing of numerous nuclear transcripts and contributing to tumorigenesis by altering global splicing patterns and inhibiting RNA editing[1][4]. In cancer, particularly hepatocellular carcinoma, DAP3 promotes proliferation, migration, invasion, and mitochondrial respiration and may facilitate resistance to apoptosis[5]. DAP3 is indispensable for mammalian development, and its deficiency disrupts mitochondrial integrity and cellular homeostasis. While not currently a direct pharmacological target, its unique dual role in mitochondrial maintenance and apoptosis renders it a molecule of high biological interest and medical relevance, especially in cancer and mitochondrial diseases.

Other names

Small ribosomal subunit protein mS29MRPS29MRP-S29S29mtbMRP-1028S ribosomal protein S29, mitochondrialIonizing radiation resistance conferring proteinPRLTS7MGC126058MGC126059DKFZp686G12159mS29

Not applicable; DAP3 is not a direct target of therapeutic drugs, but its activity modulates response to apoptosis-inducing agents (e.g., TRAIL, TNF, Fas ligand)[1][4].