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- W2367681582 abstract "We have shown previously that the M1 dou- ble-stranded (ds) RNA (i.e., the killer plasmid (KIL-kl)) that codes for a protein toxin requires spermidine or spermine for its replication. We now report that replication of two other ds RNA plasmids of yeast also requires polyamines: (i) M2 ds RNA ((KIL-k2)) and (ii) L-A-E, a ds RNA plasmid carrying the non-Mendelian genetic element (EXL). Putrescine alone is sufficient to maintain L-A-E but is not sufficient to maintain either M1 ds RNA or M2 ds RNA, which require either spermi- dine or spermine. Once M1 or M2 or L-A-E is lost, it cannot be restored by the addition of polyamines. In contrast, L-A-HN, a ds RNA molecule that carries the cytoplasmic genes (HOK) and (NEX), is not lost during polyamine deprivation. It is striking that polyamine deprivation differentially affects L-A- E and L-A-HN, even though these two ds RNA molecules have more than 99% homology. L-C, which is the same size as L-A but very different in sequence, is also not lost on polyamine starvation. It is difficult to study the role of polyamines in virus or plas- mid replication in most eukaryote cells largely because, in most such systems, genetic studies of the host cell are diffi- cult. Consequently, we have been studying the role of poly- amines in the maintenance of some double-stranded (ds)" @default.
- W2367681582 created "2016-06-24" @default.
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- W2367681582 date "2016-01-01" @default.
- W2367681582 modified "2023-09-27" @default.
- W2367681582 title "Saccharomyces cerevisiae (killer plasmids/double-stranded RNA replication/putrescine/spermi" @default.
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