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- W1693558038 abstract "An improved assay for phosphomannanase (an enzyme required for the preparation of yeast protoplasts) has been developed based on the release of mannan from yeast cell walls. A procedure for the growth of Bacillus circulans on a large scale for maximal production of the enzyme is described. The culture medium containing the secreted enzyme was concentrated, and the enzyme was purified by protamine sulfate treatment, ammonium sulfate fractionation, gel filtration on P-100, and isoelectric density gradient electrophoresis. Although the enzyme was purified to apparent homogeneity, it still contained laminarinase activity which could not be separated by size or charge. The two enzymatic activities also exhibited two isoelectric points ( p H 5.9 and 6.8) on ampholine electrophoresis. The laminarinase was not active on yeast glucan. The enzyme preparation was shown to remove mannan from yeast without removing glucan. Electron microscopic observation supports the idea that this mannan is the outer layer of the yeast wall. Phosphomannanase will produce protoplasts from yeast when supplemented with relatively low amounts of snail enzyme. This activity is present in snail enzyme but appeares to be rate-limiting when snail enzyme alone is used. Phosphomannanase has proven useful for studying the macromolecular organization of polymers in the yeast cell wall." @default.
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- W1693558038 date "1970-04-01" @default.
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- W1693558038 title "Purification of Phosphomannanase and Its Action on the Yeast Cell Wall" @default.
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- W1693558038 doi "https://doi.org/10.1128/jb.102.1.261-270.1970" @default.
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