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. 1986 Sep 11;14(17):6871–6884. doi: 10.1093/nar/14.17.6871

Efficient isolation of the linear DNA killer plasmid of Kluyveromyces lactis: evidence for location and expression in the cytoplasm and characterization of their terminally bound proteins.

J C Stam, J Kwakman, M Meijer, A R Stuitje
PMCID: PMC311705  PMID: 3763395

Abstract

Differential centrifugation of an osmotic lysate of K. lactis protoplasts showed that the linear DNA killer plasmids of K. lactis, pGKL1 and pGKL2, are almost exclusively present in the cytoplasmic fraction. This fractionation procedure allows the rapid isolation of large amounts of plasmid DNA without contamination by chromosomal and mitochondrial DNA. With these DNA preparations the size of the terminally bound proteins was estimated to be 28 and 36 kDal for pGKL1 and pGKL2, respectively. The entire pGKL1 sequence (except for 21 base pairs at the right terminus) was cloned in a shuttle vector that permits autonomous replication in the nucleus of K. lactis. However, killer gene expression could not be established in transformants. In connection with the observed cytoplasmic localization, this result suggests that gene expression of the killer DNA plasmids is entirely cytoplasmic.

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