菌体外プロテアーゼ生産酵母の分布 (酵母の菌体外プロテアーゼに関する研究-1,2-)

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Of some 230 strains of yeast belonging to over 120 species, the extracellular production of protease was tested and found in 61 strains there of. Some strains of Endomycopsis, Pichia, Cryptococcus, Candida, Trichosporon, Rhodosporidium, Rhodotorula and Sporobolomyces produced extracellular protease, whereas no activity was observed in the representatives of Saccharomyces, Hansenula, Schizosaccharomyces and Kloekera. Rhodotorula glutinis, Rhodotorula rubra, Rhodosporidium sphaerocarpum, Torulopsis ingeniosa, Cryptococcus albidus, etc., for example, did produce some acid protease when they were cultured at initial pH value of 3. 0, but at pH 6. 5 the production was negligible. Some acid protease, however, was produced by Endomycopsis fibuligera in the medium of pH 6.5. Neutral proteases were produced by Candida lipolytica, Cryptococcus dimennae, etc. but its activity was slight.
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