Role of RNA structure in non-homologous recombination between genomic molecules of brome mosaic virus.

Abstract:

:Brome mosaic virus (BMV) is a tripartite genome, positive-sense RNA virus of plants. Previously it was demonstrated that local hybridization between BMV RNAs (RNA-RNA heteroduplex formation) efficiently promotes non-homologous RNA recombination. In addition, studies on the role of the BMV polymerase in RNA recombination suggested that the location of non-homologous crossovers depends mostly on RNA structure. As a result, a detailed analysis of a large number of non-homologous recombinants generated in the BMV-based system was undertaken. Recombination hot-spots as well as putative elements in RNA structure enhancing non-homologous crossovers and targeting them in a site-specific manner were identified. To verify these observations the recombinationally active sequence in BMV RNA3 derivative was modified. The results obtained with new RNA3 mutants suggest that the primary and secondary structure of the sequences involved in a heteroduplex formation rather than the length of heteroduplex plays the most important role in the recombination process. The presented data indicate that the sequences proximal to the heteroduplex may also affect template switching by BMV replicase. Moreover, it was shown that both short homologous sequences and a hairpin structure have to accompany a double-stranded region to target non-homologous crossovers in a site-specific manner.

journal_name

Nucleic Acids Res

journal_title

Nucleic acids research

authors

Figlerowicz M

doi

10.1093/nar/28.8.1714

keywords:

subject

Has Abstract

pub_date

2000-04-15 00:00:00

pages

1714-23

issue

8

eissn

0305-1048

issn

1362-4962

pii

gkd291

journal_volume

28

pub_type

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