Role of RNA Structure in Non-homologous Recombination Between Genomic Molecules of Brome Mosaic Virus

Overview

Journal Nucleic Acids Res

Publisher Oxford University Press

Specialty Biochemistry

Date 2000 Mar 29

PMID 10734190

Citations 16

Authors

M Figlerowicz

Affiliations

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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.

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