A novel endoribonuclease lock: finding the key

Endoribonucleases are critical enzymes that mediate RNA cleavage, playing a central role in gene regulation and cellular defense. Their activity must be precisely controlled to remove harmful RNAssuch as those derived from viruses and transposonswithout unintentionally degrading essential transcripts. In the germline, transposon silencing is vital for genome stability and fertility. The nematode C. elegans provides a powerful model to study this process, with RDE-8 functioning as a key endoribonuclease that targets transposon-derived RNAs. Loss of RDE-8 results in transposon mobilization, leading to genomic instability and sterility. My postdoctoral research investigates the molecular mechanisms that govern RDE-8 specificity and regulation. Using biochemical and structural approaches (cryo-EM, X-ray crystallography) complemented by computational modeling, I have identified a mechanism that maintains RDE-8 in an inactive state to prevent aberrant RNA cleavage. My current work focuses on elucidating how protein cofactors facilitate RDE-8s activation with spatiotemporal precision. Orthologous endoribonucleases in humans also contribute to cellular defense. Understanding how RDE-8 is regulated in C. elegans could reveal conserved principles of nuclease control with broader implications for RNA metabolism and genome stability.