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The ZSWIM8 ubiquitin ligase mediates target-directed microRNA degradation
Charlie Y Shi1,2,3, Elena R Kingston1,2,3, Benjamin Kleaveland4
1Howard Hughes Medical Institute, Whitehead Institute for Biomedical Research, Cambridge, MA 02142, USA.
Science (New York, N.Y.)
|November 13, 2020
Summary
Target-directed miRNA degradation (TDMD) requires the ZSWIM8 E3 ubiquitin ligase, exposing miRNAs for breakdown. This mechanism shapes microRNA levels across many animals.
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- MicroRNAs (miRNAs) regulate gene expression by associating with Argonaute (AGO) proteins.
- While AGO binding typically protects miRNAs, certain target RNA interactions can lead to miRNA degradation.
Purpose of the Study:
- To elucidate the mechanism of target-directed miRNA degradation (TDMD).
- To identify the molecular players involved in TDMD and their role in miRNA stability.
Main Methods:
- Investigated the role of the ZSWIM8 Cullin-RING E3 ubiquitin ligase in TDMD.
- Conducted loss-of-function studies in mammalian, fly, and nematode cells.
Main Results:
- TDMD requires the ZSWIM8 Cullin-RING E3 ubiquitin ligase.
- A model was proposed where target-directed AGO proteolysis exposes miRNAs for degradation.
- ZSWIM8 accelerates the degradation of many short-lived miRNAs in bilaterian animals.
Conclusions:
- The ZSWIM8 E3 ubiquitin ligase is a key regulator of TDMD.
- This pathway significantly influences miRNA half-lives and gene regulation in animals.
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