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Volume 140, Issue 6

Linear DNA plasmids from and Free

Abstract

Linear DNA plasmids were found in the following yeasts: four strains of , one of , one of and four of . In each case, the plasmids were present as a pair of DNA molecules of different sizes. The plasmids of strains were associated with a killer activity and their structure was similar to the known killer plasmids pGKL1 and 2. The plasmids from the other three species were different from pGKL plasmids and showed no killer activity against the yeast species tested so far. In all cases, the linear molecules possessed terminal (probably inverted) repeats and their 5′ ends had a protected structure insensitive to λ exonuclease, while the 3′ ends were accessible to exonuclease III. All these strains could be efficiently cured of the plasmids by ultraviolet irradiation. The plasmids from (pDH1 A and B) and from (pWR1A and B) shared related sequences with some of the killer plasmid genes (encoding the supposed DNA polymerases, RNA polymerase and the chitinase), suggesting related genome organization of these plasmids. The pair of plasmids from (pPE1 A and B) appear to be a distantly related member of the group. This pair showed no sequence homology with other plasmids, except weak homology with the putative RNA polymerase gene of pGKL2. None of the plasmids contained the sequences homologous to ORF3 and ORF4 of pGKL1 encoding the toxin resistance determinant and the toxin γ subunit, respectively.

  • Received:
  • Accepted:
  • Revised:
  • Published Online:
Keyword(s): Debanowyces hansenii , linear DNA plasmids , Pichia etchellsii , Wingea robertsiae and yeast plasmids
© Society for General Microbiology 1994
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1994-06-01
2024-12-10
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/content/journal/micro/10.1099/00221287-140-6-1327
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Linear DNA plasmids from Pichia etchellsii, Debaryomyces hansenii and Wingea robertsiae
Microbiology 140, 1327 (1994); https://doi.org/10.1099/00221287-140-6-1327
/content/journal/micro/10.1099/00221287-140-6-1327
/content/journal/micro/10.1099/00221287-140-6-1327
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