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1998 | 45 | 4 |

Tytuł artykułu

RNA recombination in brome mosaic virus, a model plus strand RNA virus

Warianty tytułu

Języki publikacji

EN

Abstrakty

EN
Studies on the molecular mechanism of genetic recombination in RNA viruses have progressed at the time when experimental systems of efficient recombination crossovers were established. The system of brome mosaic virus (BMV) represents one of the most useful and most advanced tools for investigation of the molecular aspects of the mechanism of RNA-RNA recombination events. By using engineered BMV RNA components, the occurrence of both homologous and nonhomologous crosses were demonstrated among the segments of the BMV RNA genome. Studies show that the two types of crossovers require different RNA signal sequences and that both types depend upon the participation of BMV replicase proteins. Mutations in the two BMV-encoded replicase polypeptides (proteins 1a and 2a) reveal that their different regions participate in homologous and in nonhomologous crossovers. Based on all these data, it is most likely that homologous and nonhomologous recombinant crosses do occur via two different types of template switching events (copy-choice mechanism) where viral replicase complex changes RNA templates during viral RNA replication at distinct signal sequences. In this review we discuss various aspects of the mechanism of RNA recombination in BMV and we emphasize future projections of this research.

Wydawca

-

Rocznik

Tom

45

Numer

4

Opis fizyczny

p.847-868,fig.

Twórcy

  • Polish Academy of Sciences, Poznan, Poland

Bibliografia

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