| Abstract: | The properties of a teichoic acid degrading enzyme (teichoicase) isolated from Bacillus subtilis Marburg are described. The purified enzyme showed phosphodiesterase activity but not phosphomonoesterase activity, and it had an absolute substrate specificity for alpha-glucosylated glycerol teichoic acid, the endogenous cell wall teichoic acid of the enzyme-producing cell. The substrate was degraded by an exo-mechanism yielding the monomer alpha-D-glucose 1 leads to 2 (sn)glycero-3-phosphate. When B. subtilis Marburg was grown in a rich medium, enzyme activity was detected in extracts from sporulating cells. Teichoicase activity was present in a mutant blocked in stage II of the sporulation process but was absent in a mutant blocked in stage O. It was concluded that teichoicase is active on enzyme-producing cells since the reaction product could be detected in their culture supernatant. Attempts to demonstrate analogous enzyme activity in other Bacillus strains failed. The enzyme could be used for the rapid detection of alpha-glucosylated glycerol teichoic acid and for the controlled alteration of native bacterial cell surfaces exhibiting the appropriate structure. |
