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The linear dsDNA plasmids, pGKL1 (8.9 kb) and pGKL2 (13.4 kb) discovered in Kluyveromyces lactis, confer killer and immunity characteristics upon various yeast strains. We have devised an immunity assay and have been able to show the expression of an immunity phenotype in the K. lactis transformants harbouring conventional circular plasmids which contain DNA fragments of pGKL1. Using this expression system, the immunity determinant on pGKL1 was identified as ORF5. In addition, the presence of pGKL2 was proved to be essential for the expression of the immunity phenotype. This is the first demonstration of this new pGKL2 function, as distinct from its known functions for the replication and maintenance of pGKL1 in yeast cells.

Expression and identification of immunity determinants on linear DNA killer plasmids pGKL1 and pGKL2 inKluyveromyces lactis