[A replication enhancer of viral origin increases the mitotic stability of yeast transformants].

It is shown in this paper that a DNA fragment of Hepatitis B virus possessing structural features of yeast replication enhancer increases the mitotic stability of yeast transformants containing hybrid plasmids of episomal and replicative types. The mitotic stability of transformants with plasmid of the replicative type and with the replication enhancer increases only in [cir+] cells. Comparison of primary sequences of HBV DNA of different subtypes revealed that only DNA has unique structural features of the yeast enhancer of replication.