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Bacterial Artificial Chromosomes: A Functional Genomics Tool for the Study of Positive-strand RNA Viruses

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Published on: December 29, 2015

Functional RNA elements in the dengue virus genome.

Leopoldo G Gebhard¹, Claudia V Filomatori, Andrea V Gamarnik

¹Fundación Instituto Leloir-CONICET, Avenida Patricias Argentinas 435, C1405BWE, Buenos Aires, Argentina. lgebhard@leloir.org.ar

|October 14, 2011

Summary

Dengue virus (DENV) RNA replication relies on dynamic viral genome structures. These structures, including the 5' promoter, interact with the NS5 polymerase to regulate viral RNA synthesis and life cycle progression.

Keywords:

NS5 protein RNA structures dengue virus flavivirus RNA genome cyclization viral RNA replication viral RdRp

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Published on: November 1, 2011

Area of Science:

Virology
Molecular Biology
Structural Biology

Background:

Dengue virus (DENV) genome amplification involves viral RNA, proteins, and cellular membranes.
The viral RNA actively participates in replication, acting as promoters, enhancers, and silencers.
RNA elements modulating replication are found in UTRs and coding sequences.

Purpose of the Study:

To describe elements in the stem loop A (SLA) promoter and other RNA signals involved in NS5 polymerase binding and activity.
To propose new ideas on how dynamic secondary and tertiary structures of the viral RNA participate in the DENV life cycle.

Main Methods:

Analysis of RNA elements and structures involved in DENV replication.
Investigation of interactions between viral RNA elements and the NS5 polymerase.
Exploration of dynamic RNA conformations during the viral life cycle.

Main Results:

The promoter for DENV RNA synthesis is a 5' stem loop structure interacting with NS5 polymerase.
Long-range RNA-RNA interactions mediate a circularized viral genome conformation.
Alternative, mutually exclusive RNA structures highlight the genome's flexibility and conformational diversity.

Conclusions:

Dynamic secondary and tertiary structures of the DENV RNA are crucial for its life cycle.
Understanding these RNA structures and their interactions with NS5 provides insights into DENV replication.
Further research into RNA conformational dynamics can reveal new therapeutic targets for dengue.