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RDR6-mediated synthesis of complementary RNA is terminated by miRNA stably bound to template RNA

Rajeswaran, R. and Pooggin, M. M.. (2012) RDR6-mediated synthesis of complementary RNA is terminated by miRNA stably bound to template RNA. Nucleic Acids Research, 40 (2). pp. 594-599.

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Official URL: http://edoc.unibas.ch/dok/A6070633

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Abstract

RNA-dependent RNA polymerase RDR6 is involved in the biogenesis of plant trans-acting siRNAs. This process is initiated by miRNA-directed and Argonaute (AGO) protein-mediated cleavage of TAS gene transcripts. One of the cleavage products is converted by RDR6 to double-stranded (ds) RNA, the substrate for Dicer-like 4 (DCL4). Interestingly, TAS3 transcript contains two target sites for miR390::AGO7 complexes, 50-non-cleavable and 3'-cleavable. Here we show that RDR6-mediated synthesis of complementary RNA starts at a third nucleotide of the cleaved TAS3 transcript and is terminated by the miR390:: AGO7 complex stably bound to the non-cleavable site. Thus, the resulting dsRNA has a short, 2-nt, 3'-overhang and a long, 220-nt, 5'-overhang of the template strand. The short, but not long, overhang is optimal for DCL4 binding, which ensures dsRNA processing from one end into phased siRNA duplexes with 2-nt 3'-overhangs.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Botanik > Pflanzenphysiologie Pathogenabwehr (Boller)
UniBasel Contributors:Pooggin, Mikhail and Rajeswaran, Rajendran
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:Oxford University Press
ISSN:0305-1048
e-ISSN:1362-4962
Note:Publication type according to Uni Basel Research Database: Journal article
Language:English
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Last Modified:10 Oct 2017 08:40
Deposited On:01 Mar 2013 11:12

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