Scientific article
Open access

Inhibition of Sendai virus genome replication due to promoter-increased selectivity: a possible role for the accessory C proteins

Published inJournal of Virology, vol. 71, no. 12, p. 9588-9599
Publication date1997

The role of the negative-stranded virus accessory C proteins is difficult to assess because they appear sometimes as nonessential and thereby of no function. On the other hand, when a function is found, as in the case of Sendai virus, it represents an enigma, in that the C proteins inhibit replication under conditions where the infection follows an exponential course. Furthermore, this inhibitory function is exerted differentially: in contrast to the replication of internal deletion defective interfering (DI) RNAs, that of copy-back DI RNAs appears to escape inhibition, under certain experimental conditions (in vivo assay). In a reexamination of the C effect by the reverse genetics approach, it was found that copy-back RNA replication is inhibited by C in vivo as well, under conditions where the ratio of C to copy-back template is increased. This effect can be reversed by an increase in P but not L protein. The "rule of six" was differentially observed in the presence or absence of C. Finally, a difference in the ability of the replicating complex to tolerate promoter modifications in RNA synthesis initiation was shown to occur in the presence or the absence of C as well. We propose that C acts by increasing the selectivity of the replicating complex for the promoter cis-acting elements governing its activity. The inhibitory effect of C becomes the price to pay for this increased selectivity.

  • DNA-Directed RNA Polymerases
  • Defective Viruses/genetics/physiology
  • Genome
  • Viral
  • HeLa Cells
  • Humans
  • Phosphoproteins/genetics/metabolism
  • Promoter Regions
  • Genetic
  • RNA
  • Viral/biosynthesis
  • Respirovirus/genetics/physiology
  • Viral Proteins/genetics/metabolism
  • Virus Replication
Citation (ISO format)
TAPPAREL, Caroline et al. Inhibition of Sendai virus genome replication due to promoter-increased selectivity: a possible role for the accessory C proteins. In: Journal of Virology, 1997, vol. 71, n° 12, p. 9588–9599. doi: 10.1128/JVI.71.12.9588-9599.1997
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Article (Published version)
ISSN of the journal0022-538X

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