DIS3L2 and LSm proteins are involved in the surveillance of Sm ring-deficient snRNAs

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Authors

ROITHOVA A. FEKETOVÁ Zuzana VAŇÁČOVÁ Štěpánka STANEK D.

Year of publication 2020
Type Article in Periodical
Magazine / Source Nucleic acids research
MU Faculty or unit

Central European Institute of Technology

Citation
Web https://academic.oup.com/nar/article/48/11/6184/5831191
Doi http://dx.doi.org/10.1093/nar/gkaa301
Keywords MESSENGER-RNA; DEGRADATION PATHWAY; NONCODING RNAS; TRANSLATION FACTORS; STRUCTURAL BASIS; TRUNCATED FORMS; QUALITY-CONTROL; CAJAL BODIES; CORE DOMAIN; COMPLEX
Description Spliceosomal small nuclear ribonucleoprotein particles (snRNPs) undergo a complex maturation pathway containing multiple steps in the nucleus and in the cytoplasm. snRNP biogenesis is strictly proof-read and several quality control checkpoints are placed along the pathway. Here, we analyzed the fate of small nuclear RNAs (snRNAs) that are unable to acquire a ring of Sm proteins. We showed that snRNAs lacking the Sm ring are unstable and accumulate in P-bodies in an LSm1-dependent manner. We further provide evidence that defective snRNAs without the Sm binding site are uridylated at the 3' end and associate with DIS3L2 3'-> 5' exoribonuclease and LSm proteins. Finally, inhibition of 5'-> 3' exoribonuclease XRN1 increases association of Delta Sm snRNAs with DIS3L2, which indicates competition and compensation between these two degradation enzymes. Together, we provide evidence that defective snRNAs without the Sm ring are uridylated and degraded by alternative pathways involving either DIS3L2 or LSm proteins and XRN1.
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