ISSN:
1432-072X
Keywords:
Basidiomycetous yeast
;
Rhodosporidium toruloides
;
Rhodotorucine A
;
Mating pheromone gene
;
Genomic organization
;
Mating types
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract Rhodotorucine A, a lipopeptide mating pheromone, is secreted from mating type A cells of Rhodosporidium toruloides and induces sexual differentiation of the opposite mating type a cells. Genome of A-type cells contains three homologous genes (RHA1, RHA2, and RHA3) encoding rhodotorucine A. Genomic Southern blot analysis using RHA1 DNA as a probe showed that RHA1 strongly hybridize with A-type genomic DNA but weakly with a-type, suggesting that the sequences of RHA genes were dissimilar in the opposite a-type genome. The range of dissimilar regions in a-type genome was searched using RHA-flanking DNA segments as probes. The result suggests that a-type genome lacks sequences coding for rhodotorucine A and its 5′ upstream but contains its 3′ non-coding sequences. The absence of mating pheromone genes in the opposite mating type genome suggests that the expression of mating-type-specific genes in R. toruloides is not controlled trans-criptionally, as shown in the yeast Saccharomyces cerevisiae.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00446934
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