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Argonaute regulation: two roads to the same destination
Judith Hauptmann1, Gunter Meister
1Biochemistry Center Regensburg (BZR), Laboratory for RNA Biology, University of Regensburg, Universitätsstrasse 31, 93053 Regensburg, Germany.
Developmental Cell
|June 29, 2013
Summary
Two studies reveal how Argonaute protein levels and activity are regulated. MicroRNA availability controls Argonaute protein levels, while phosphorylation affects its loading.
Area of Science:
- Molecular Biology
- Biochemistry
- Genetics
Background:
- Argonaute (Ago) proteins are central to RNA silencing pathways, including microRNA (miRNA)-mediated gene regulation.
- Understanding the regulation of Ago protein levels and activity is crucial for comprehending gene expression control.
Purpose of the Study:
- To elucidate the mechanisms governing Argonaute protein regulation.
- To investigate the impact of microRNA availability and protein phosphorylation on Ago function.
Main Methods:
- Analysis of Argonaute protein levels in response to varying microRNA availability.
- Investigation of epidermal growth factor receptor (EGFR)-mediated phosphorylation of Ago2.
- Assessment of Ago2 phosphorylation's effect on its loading with small RNAs.
Main Results:
- Smibert et al. demonstrated that microRNA availability directly influences the stability and levels of Argonaute proteins.
- Shen et al. identified that phosphorylation of Ago2, mediated by the epidermal growth factor receptor, impacts its ability to load with guide RNAs.
- These findings highlight distinct regulatory inputs controlling Ago protein homeostasis and function.
Conclusions:
- Argonaute protein regulation is multifaceted, involving both post-transcriptional control of protein levels and post-translational modification affecting activity.
- MicroRNA biogenesis and signaling pathways are intertwined with the regulation of the core RNA-induced silencing complex machinery.
- These regulatory mechanisms provide insights into the dynamic control of gene silencing by Argonaute proteins.
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