What does Dicer do to dsRNA?
Dicer processes long double-stranded RNA (dsRNA) and pre-microRNAs to generate the functional intermediates (short interfering RNAs and microRNAs) of the RNA interference pathway.
How does Dicer recognize dsRNA?
The helicase domain of Dicer-2 recognizes dsRNA termini to initiate processive cleavage by a threading mechanism. Dicer ribonucleases cleave double-stranded RNA (dsRNA) precursors to generate microRNAs (miRNAs) and small interfering RNAs (siRNAs) (1, 2).
What is the function of the PAZ domains in Dicer and Argonaute proteins?
What is the function of the PAZ domains in Dicer and Argonaute proteins? In both proteins, the PAZ domains recognize and bind the 5′ end of a double-stranded RNA molecule. In Dicer, PAZ has RNase III activity used to cleave a double-stranded pre-miRNA.
What does the enzyme Dicer cuts dsRNA into?
Being part of the RNase III family, Dicer cleaves double-stranded RNA (dsRNA) and pre-microRNA (pre-miRNA) into short double-stranded RNA fragments called small interfering RNA and microRNA, respectively.
What are the function of Dicer in the RNA interference pathway?
Abstract. In antiviral RNA interference (RNAi), Dicer plays a primary role in processing double-stranded RNA (dsRNA) molecules into small-interfering RNAs (siRNAs) that guide Argonaute effectors to posttranscriptional suppression of target viral genes.
What do Paz domains do?
The function of the domains is unknown but has been suggested to mediate complex formation between proteins of the Piwi and Dicer families by hetero-dimerisation. The three-dimensional structure of this domain has been solved. The PAZ domain is composed of two subdomains.
What do Argonaute proteins do?
The highly conserved Argonaute protein family members play a central role in the regulation of gene expression networks, orchestrating the establishment and the maintenance of cell identity throughout the entire life cycle, as well as in several human disorders, including cancers.
What is Dicer function?
Dicer plays a pivotal role in the initiation of RNA silencing by recognizing double-stranded RNAs (dsRNAs) and cleaving them into small RNAs using its RNase III-like double-stranded RNA-specific nuclease activities. Small RNAs are largely classified into two groups: small-interfering RNAs (siRNAs) and microRNAs.
How does a Dicer work?
Dicer antiviral function. Antiviral RNAi is a powerful mechanism to protect against viral infections. Specific features of viral RNA are sensed as foreign, and Dicer cleaves the double-stranded viral RNA into viral siRNA [10,131–134].