Reference: Xiao W, et al. (1991) Sequence diversity of yeast 2 microns RAF gene and its co-evolution with STB and REP1. Gene 101(1):75-80

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Abstract


Despite the extensive study of yeast 2 microns plasmid, the exact function of plasmid-encoded RAF gene is not clear. Variants of 2 microns plasmids from industrial Saccharomyces cerevisiae yeasts were isolated and characterized. Sequencing of RAF alleles revealed about 8% nucleotide and 10% amino acid diversities between 2 microns variants of closely related strains, RAF sequence variations were correlated with STB-REP1 sequence diversity. We also used restriction fragment length polymorphism linkage to screen a large number of yeast strains from different fermentation industries. The results clearly show a tight linkage of STB-REP1-RAF variations. Thus, our observations suggest that plasmid-borne cis- and trans-acting elements co-evolved to form an optimal molecular parasite and that RAF may play a role in active plasmid partitioning.

Reference Type
Journal Article | Research Support, Non-U.S. Gov't
Authors
Xiao W, Pelcher LE, Rank GH
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