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By using a Brome mosaic virus (BMV)-Saccharomyces cerevisiae system, we previously showed that the cellular Lsm1p-7p/Pat1p/Dhh1p decapping-activator complex functions in BMV RNA translation and replication. As a first approach in investigating whether the corresponding human homologues play a similar role, we expressed human Lsm1p (hLsm1p) and RCK/p54 in yeast. Expression of RCK/p54 but not hLsm1p restored the defect in BMV RNA translation and replication observed in thedhh1Δ andlsm1Δ strains, respectively. This functional conservation, together with the common replication strategies of positive-stranded RNA viruses, suggests that RCK/p54 may also play a role in the replication of positive-stranded RNA viruses that infect humans.

Xenopus Xp54 and Human RCK/p54 Helicases Functionally Replace Yeast Dhh1p in Brome Mosaic Virus RNA Replication