Abstract:
:RNase III enzymes cleave double stranded (ds)RNA. This is an essential step for regulating the processing of mRNA, rRNA, snoRNA and other small RNAs, including siRNA and miRNA. Arabidopsis thaliana encodes nine RNase III: four DICER-LIKE (DCL) and five RNASE THREE LIKE (RTL). To better understand the molecular functions of RNase III in plants we developed a biochemical assay using RTL1 as a model. We show that RTL1 does not degrade dsRNA randomly, but recognizes specific duplex sequences to direct accurate cleavage. Furthermore, we demonstrate that RNase III and dsRNA binding domains (dsRBD) are both required for dsRNA cleavage. Interestingly, the four DCL and the three RTL that carry dsRBD share a conserved cysteine (C230 in Arabidopsis RTL1) in their dsRBD. C230 is essential for RTL1 and DCL1 activities and is subjected to post-transcriptional modification. Indeed, under oxidizing conditions, glutathionylation of C230 inhibits RTL1 cleavage activity in a reversible manner involving glutaredoxins. We conclude that the redox state of the dsRBD ensures a fine-tune regulation of dsRNA processing by plant RNase III.
journal_name
Nucleic Acids Resjournal_title
Nucleic acids researchauthors
Charbonnel C,Niazi AK,Elvira-Matelot E,Nowak E,Zytnicki M,de Bures A,Jobet E,Opsomer A,Shamandi N,Nowotny M,Carapito C,Reichheld JP,Vaucheret H,Sáez-Vásquez Jdoi
10.1093/nar/gkx820subject
Has Abstractpub_date
2017-11-16 00:00:00pages
11891-11907issue
20eissn
0305-1048issn
1362-4962pii
4158473journal_volume
45pub_type
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