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Ultraviolet irradiation gave rise to frequent curing of killer plasmids pGKl1 and pGK12 of Kluyveromyces lactis. Almost all of the nonkillers obtained lost both plasmids, but one of them lost only pGKl1. The disappearance of pGKl1 was accompanied by the simultaneous loss of the killer activity and of the resistance to the killer factor. A new plasmid, pGKl1S, was obtained, which arose from a deletion in the central region of pGKl1. Genetic analysis suggested that pGKl1S has the killer gene lost by the deletion and the resistance gene intact and that pGKl1S shares the same replication control with pGKl1.

Curing of the killer deoxyribonucleic acid plasmids of Kluyveromyces lactis