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Agric Biol Chem. 1990;54(2):505-9.

Isolation and properties of a chromosome-dependent KHR killer toxin in Saccharomyces cerevisiae.

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1
National Research Institute of Brewing, 2-6-30 Takinogawa, Kita-ku, Tokyo 114, Japan.

Abstract

A strain of the yeast Saccharomyces cerevisiae coding for KHR on the chromosome secreted a toxin that kills sensitive yeasts. The transformants of multicopy vectors carrying the KHR gene could secrete 3-4-fold the killer toxin of the donor strain. This toxic substance was purified 80-fold in specific activity from the culture filtrate by gel filtration and hydrophobic column chromatography. The purified toxin gave a single protein band with molecular mass of 20 kDa on SDS-PAGE and had an isoelectric point of pH 5.3. The toxin had novel killer activity against Candida glabrata and S. cerevisiae, but did not affect bacteria, fungi, or other yeasts.

PMID:
19130676
[Indexed for MEDLINE]
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