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Regulation of RNA decay and cellular function by 3'-5' exoribonuclease DIS3L2.
RNA Biology 2019 January 14
DIS3L2, in which mutations have been linked to Perlman syndrome, is an RNA-binding protein with 3'-5' exoribonuclease activity. It contains two CSD domains and one S1 domain, all of which are RNA-binding domains, and one RNB domain that is responsible for the exoribonuclease activity. The 3' polyuridine of RNA substrates can serve as a degradation signal for DIS3L2. Because DIS3L2 is predominantly localized in the cytoplasm, it can recognize, bind, and mediate the degradation of cytoplasmic uridylated RNA, including pre-microRNA, mature microRNA, mRNA, and some other non-coding RNAs. Therefore, DIS3L2 plays an important role in cytoplasmic RNA surveillance and decay. DIS3L2 is involved in multiple biological and physiological processes such as cell division, proliferation, differentiation, and apoptosis. Nonetheless, the function of DIS3L2, especially its association with cancer, remains largely unknown. We summarize here the RNA substrates degraded by DIS3L2 with its exonucleolytic activity, together with the corresponding biological functions it is implicated in. Furthermore, we discuss whether DIS3L2 can function independently of its 3'-5' exoribonuclease activity, as well as its potential tumor-suppressive or oncogenic roles during cancer progression.
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