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Occurrence of an endo-1,3-beta-glucanase in culture fluids of the yeast Candida utilis. Purification and characterization of the enzyme activity.

ABSTRACT: The endo-1,3-beta-glucanase (EC 3.2.1.6) secreted into the culture medium by cells of Candida utilis was isolated and purified to homogeneity on polyacrylamide-gel electrophoresis and in ultracentrifugation studies (s20,w = 1.97S). The purified enzyme represented only 0.001% of the total 1,3-beta-glucanase activity, the remainder being due to an exo-1,3-beta-glucanase enzyme, and behaved as an acidic glycoprotein (pI 3.3) in isoelectric-focusing experiments. The mol.wt. was estimated to be 21 000 by gel filtration and polyacrylamide-gel electrophoresis. Studies on the hydrolysis of different substrates showed that the enzyme was only able to break down (1 leads to 3)-beta-linkages, by an endo-splitting mechanism. Glucono-delta-lactone, D-glucoronolactone and heavy metal ions such as Hg2+ were inhibitors of the enzyme activity. The function of this endo-beta-glucanase in C. utilis is discussed.

SUBMITTER: Villa TG

PROVIDER: S-EPMC1186344 | biostudies-other | 1979 Jan

REPOSITORIES: biostudies-other

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Control of β-glucan exposure by the endo-1,3-glucanase Eng1 in Candida albicans modulates virulence.

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