DIS3 exosome endoribonuclease and 3'-5' exoribonuclease (DIS3)

DIS3 is a highly conserved ribonuclease that serves as the primary catalytic subunit of the RNA exosome complex, a multi-protein assembly responsible for the 3'-5' degradation and processing of a broad spectrum of nuclear and cytoplasmic RNAs in eukaryotic cells. DIS3 possesses both exoribonuclease activity (via its RNase II (RNB) domain) and endoribonuclease activity (via its N-terminal PIN domain), enabling it to process a wide variety of structured and unstructured RNA substrates. The exosome complex, by incorporating DIS3, plays a vital role in RNA surveillance, maturation, and turnover, affecting gene expression and cellular homeostasis. In humans, DIS3 is present mainly in the nucleus, with closely related but non-redundant paralogues (DIS3L, DIS3L2) found in the cytoplasm. Mutations in the DIS3 gene, particularly in the RNB domain, are recurrent in multiple myeloma (approximately 11% of patients) and are implicated in malignancy development, possibly via dysregulation of RNA degradation pathways. Essential for cell viability, DIS3's function intersects with cell cycle regulation, microtubule organization, and immune processes like antibody diversification. Given its central role in RNA metabolism and link to disease, DIS3 is considered a promising but challenging therapeutic target; pharmacological inhibition must be approached with caution due to its essential cellular functions.

Other names

Exosome complex exonuclease RRP44KIAA1008RRP44dis3pEXOSC11Protein DIS3 homologRibosomal RNA-processing protein 44exosome component 112810028N01Rikmitotic control protein dis3 homolog

For hypothetical or experimental modulators: inhibition of exoribonuclease or endoribonuclease activity, primarily affecting RNA decay and processing pathways