DCL4 targets Cucumber mosaic virus satellite RNA at novel secondary structures

Quan Sheng Du, Cheng Guo Duan, Zhong Hui Zhang, Yuan Yuan Fang, Rong Xiang Fang, Qi Xie, Hui Shan Guo

Research output: Contribution to journalArticle

57 Citations (Scopus)

Abstract

It has been reported that plant virus-derived small interfering RNAs (vsiRNAs) originated predominantly from structured single-stranded viral RNA of a positive single-stranded RNA virus replicating in the cytoplasm and from the nuclear stem-loop 35S leader RNA of a double-stranded DNA (dsDNA) virus. Increasing lines of evidence have also shown that hierarchical actions of plant Dicer-like (DCL) proteins are required in the biogenesis process of small RNAs, and DCL4 is the primary producer of vsiRNAs. However, the structures of such single-stranded viral RNA that can be recognized by DCLs remain unknown. In an attempt to determine these structures, we have cloned siRNAs derived from the satellite RNA (satRNA) of Cucumber mosaic virus (CMV-satRNA) and studied the relationship between satRNA-derived siRNAs (satsiRNAs) and satRNA secondary structure. satsiRNAs were confirmed to be derived from single-stranded satRNA and are primarily 21 (64.7%) or 22 (22%) nucleotides (nt) in length. The most frequently cloned positive-strand satsiRNAs were found to derive from novel hairpins that differ from the structure of known DCL substrates, miRNA and siRNA precursors, which are prevalent stem-loop-shaped or dsRNAs. DCL4 was shown to be the primary producer of satsiRNAs. In the absence of DCL4, only 22-nt satsiRNAs were detected. Our results suggest that DCL4 is capable of accessing flexibly structured single-stranded RNA substrates (preferably T-shaped hairpins) to produce satsiRNAs. This result reveals that viral RNA of diverse structures may stimulate antiviral DCL activities in plant cells.

Original languageEnglish (US)
Pages (from-to)9142-9151
Number of pages10
JournalJournal of Virology
Volume81
Issue number17
DOIs
StatePublished - Sep 1 2007

Fingerprint

Cucumber Mosaic Virus Satellite
Satellite RNAs
satellite RNA
Cucumber mosaic virus
Viral RNA
RNA
Small Interfering RNA
small interfering RNA
Nucleotides
Viruses
Plant Viruses
nucleotides
dsRNA viruses
Double-Stranded RNA
RNA Viruses
Plant Cells
MicroRNAs
stems
Antiviral Agents
plant viruses

ASJC Scopus subject areas

  • Immunology
  • Virology

Cite this

Du, Q. S., Duan, C. G., Zhang, Z. H., Fang, Y. Y., Fang, R. X., Xie, Q., & Guo, H. S. (2007). DCL4 targets Cucumber mosaic virus satellite RNA at novel secondary structures. Journal of Virology, 81(17), 9142-9151. https://doi.org/10.1128/JVI.02885-06

DCL4 targets Cucumber mosaic virus satellite RNA at novel secondary structures. / Du, Quan Sheng; Duan, Cheng Guo; Zhang, Zhong Hui; Fang, Yuan Yuan; Fang, Rong Xiang; Xie, Qi; Guo, Hui Shan.

In: Journal of Virology, Vol. 81, No. 17, 01.09.2007, p. 9142-9151.

Research output: Contribution to journalArticle

Du, QS, Duan, CG, Zhang, ZH, Fang, YY, Fang, RX, Xie, Q & Guo, HS 2007, 'DCL4 targets Cucumber mosaic virus satellite RNA at novel secondary structures', Journal of Virology, vol. 81, no. 17, pp. 9142-9151. https://doi.org/10.1128/JVI.02885-06
Du, Quan Sheng ; Duan, Cheng Guo ; Zhang, Zhong Hui ; Fang, Yuan Yuan ; Fang, Rong Xiang ; Xie, Qi ; Guo, Hui Shan. / DCL4 targets Cucumber mosaic virus satellite RNA at novel secondary structures. In: Journal of Virology. 2007 ; Vol. 81, No. 17. pp. 9142-9151.
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