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The p36 and p95 proteins of Carnation Italian ringspot virus (CIRV), when expressed in Saccharomyces cerevisiae, supported the replication of defective interfering (DI) RNA. Double-label confocal immunofluorescence showed that both proteins localized to mitochondria, independently of each other. DI RNA progeny was localized by in situ hybridization both to mitochondria and to their proximity. Fractionation of cell extracts showed that replicase proteins associated with membranes with a consistent portion of DI RNA. DI RNA transcripts were stabilized more efficiently when co-expressed with both p36 and p95 than with either protein alone. By using the copper-inducible CUP1 promoter, p36 was shown to have an effect on DI RNA stability only above a threshold concentration, suggesting an 'all-or-none' behaviour. Conversely, the stabilizing activity of p95 was proportional to protein concentration in the range examined. Similarly, DI RNA replication level was proportional to p95 concentration and depended on a threshold concentration of p36.

The p36 and p95 replicase proteins of Carnation Italian ringspot virus cooperate in stabilizing defective interfering RNA