Cyclic diguanylic acid stimulates 1,4-μ-glucan synthase fromSaprolegnia monoica

Abstract

Abstract 1,4-μ-Glucan synthase activity, but not 1,3-μ-glucan-synthase activity, from Saprolegnia monoica was stimulated by cyclic-diguanylic acid, an immediate activator of Acetobacter xylinum - cellulose synthase. This activator, which increased the V max without modifying the K m for UDP-glucose, was active on solubilized and partially purified enzymes. These results suggest that the fungal system shares a common regulatory mechanism with the bacterial system.