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Immunization of the industrial fermentation starter culture strain of Saccharomyces cerevisiae to a contaminating killer toxin-producing Candida tropicalis
Date
2004-12-01
Author
Izgu, F
Altinbay, D
Derinel, Y
Metadata
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K3 killer trait was introduced into the fermentation starter strain of Saccharomyces cerevisiae BSP 1 in order to construct immune industrial strain that produces K3 type killer toxin and was resistant to Candida tropicalis (K+) contamination. Protoplasts of respiration-deficient Rhodegrees strain of S. cerevisiae NCYC 761 (K3) and S. cerevisiae BSP 1 were fused. The resulting respiration-competent hybrid with K3 type killer activity was selected on media containing a non-fermentable carbon source and by a killer zone assay in a plate test, respectively. The fusant was similar to the parent strain in its fermentation and sugar utilization patterns, growth rate, dough-raising properties and osmotolerance. The newly constructed S. cerevisiae BSP 1 (K3) inhibited the growth of C tropicalis in a pH range from 3.5 to 5.0 and over a temperature range of 20-30degreesC.
Subject Keywords
Food Science
,
Microbiology
,
General Medicine
URI
https://hdl.handle.net/11511/67248
Journal
FOOD MICROBIOLOGY
DOI
https://doi.org/10.1016/j.fm.2004.03.012
Collections
Department of Biology, Article
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The yeast contaminating the starter cultures of Saccharomyces cerevisiae fermentation strains BSP 1-4, used in the Turkish baking industry, was identified as Candida tropicalis with a killer phenotype. The activity of the killer toxin against the industrial strains was optimum at pH 3.9 and 4.1 at 22-25 degrees C. The activities of some killer toxin-producing yeasts of known phenotypes against C. tropicalis were determined. Among the yeasts tested S. cerevisiae K3 and Hansenula anamola K8 were inhibitory to...
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F. Izgu, D. Altinbay, and Y. Derinel, “Immunization of the industrial fermentation starter culture strain of Saccharomyces cerevisiae to a contaminating killer toxin-producing Candida tropicalis,”
FOOD MICROBIOLOGY
, pp. 635–640, 2004, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/67248.