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Conditions for obtaining stable protoplasts from Sclerotium glucanicum and their reversion to hyphal growth were determined. 1,3-beta-Glucan synthase activity was detected in particulate enzyme fractions from mycelium and protoplasts of Scl. glucanicum. UDP-[U-14C]glucose was linearly incorporated into a beta-glucan for about 20 min at 25 degrees C. Optimum pH and temperature values, as well as thermal stabilities of the 1,3-beta-glucan synthase activity, were determined. High concentrations of EDTA were inhibitory. Enzyme activity was stimulated by ATP and GTP. The apparent Km value for UDP-glucose was 0.54 mM. The reaction product was characterized as 1,3-beta-glucan by 13C NMR spectroscopy and hydrolysis products of an exo-1,3-beta-glucanase.

1,3- -Glucan synthase in cell-free extracts from mycelium and protoplasts of Sclerotium glucanicum