A 5' RNA element promotes dengue virus RNA synthesis on a circular genome.

Abstract:

:The mechanisms of RNA replication of plus-strand RNA viruses are still unclear. Here, we identified the first promoter element for RNA synthesis described in a flavivirus. Using dengue virus as a model, we found that the viral RdRp discriminates the viral RNA by specific recognition of a 5' element named SLA. We demonstrated that RNA-RNA interactions between 5' and 3' end sequences of the viral genome enhance dengue virus RNA synthesis only in the presence of an intact SLA. We propose a novel mechanism for minus-strand RNA synthesis in which the viral polymerase binds SLA at the 5' end of the genome and reaches the site of initiation at the 3' end via long-range RNA-RNA interactions. These findings provide an explanation for the strict requirement of dengue virus genome cyclization during viral replication.

journal_name

Genes Dev

journal_title

Genes & development

authors

Filomatori CV,Lodeiro MF,Alvarez DE,Samsa MM,Pietrasanta L,Gamarnik AV

doi

10.1101/gad.1444206

subject

Has Abstract

pub_date

2006-08-15 00:00:00

pages

2238-49

issue

16

eissn

0890-9369

issn

1549-5477

pii

gad.1444206

journal_volume

20

pub_type

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