Yeast plasmids resembling 2 micron DNA: regional similarities and diversities at the molecular level.
The nucleotide sequence of two Zygosaccharomyces plasmids, pSB2 (5,415 base pairs), isolated from Zygosaccharomyces bailii, and pSM1 (5,416 base pairs), isolated from Zygosaccharomyces fermentati Naganishi, was determined. The predicted amino acid sequences of open reading frames among six yeast plasmids that resemble 2 microns DNA indicated regional sequence similarities among FLP proteins. Greater similarities were seen among Zygosaccharomyces plasmids (pSB2, pSB3, pSR1, and pSM1) than other combinations. A putative recognition site for the FLP enzyme of a Zygosaccharomyces plasmid also showed some conservation, especially in the 4 nucleotides flanking the central spacer region. From comparative studies of the sequences of putative genes of each plasmid, we propose an apparent phylogenetic relationship among yeast plasmids resembling 2 micron DNA. Among the Zygosaccharomyces plasmids, pSB2 and pSR1 are most closely related, since not only were the FLP enzymes of these two plasmids most closely related, but also the amino acid sequence of the putative P gene of pSR1 showed clear homology with that of open reading frame B of pSB2.
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