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Related Experiment Videos

Essential role of cyclization sequences in flavivirus RNA replication.

A A Khromykh1, H Meka, K J Guyatt

  • 1Sir Albert Sakzewski Virus Research Centre, Royal Children's Hospital, University of Queensland, Herston Rd., Herston, Brisbane, QLD 4029, Australia. a.khromykh@mailbox.uq.edu.au

Journal of Virology
|June 20, 2001
PubMed
Summary

Flavivirus RNA replication requires base-pairing interactions between conserved 5' and 3' terminal sequences. Disrupting these interactions prevents RNA replication, while restoring complementarity allows it, confirming their essential role.

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Replication and gene function in Kunjin virus.

Current topics in microbiology and immunology·2002

Area of Science:

  • Virology
  • Molecular Biology
  • RNA Biology

Background:

  • Flavivirus RNA replication involves interactions between conserved complementary sequences at the 5' and 3' ends.
  • Previous studies suggested a role for these cyclization sequences but lacked in vivo experimental validation.

Purpose of the Study:

  • To investigate the in vivo role of base-pairing interactions between conserved 5' and 3' terminal sequences in Flavivirus RNA replication.
  • To experimentally validate predicted RNA secondary structures and base-pairing interactions.

Main Methods:

  • Utilized M-fold program for RNA secondary structure prediction of viral genomic regions.
  • Employed site-directed mutagenesis in Kunjin virus replicon RNA to disrupt and restore complementary cyclization sequences.
  • Assessed RNA replication competence through immunofluorescence for NS3 protein and Northern blot analysis.

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Main Results:

  • M-fold predicted base-pairing between conserved 5' and 3' terminal regions in mosquito-borne Flaviviruses.
  • Mutations disrupting base-pairing in Kunjin virus replicon RNA abolished replication.
  • Compensatory mutations restoring complementarity rescued RNA replication.
  • Identified novel conserved complementary sequences in tick-borne Flaviviruses with significant base-pairing stability.

Conclusions:

  • Base-pairing between 5' and 3' terminal sequences, not the specific nucleotide sequence, is critical for Flavivirus RNA replication.
  • Multiple pairs of cyclization sequences may be involved in the replication of tick-borne Flaviviruses.