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Bacillus subtilis cell walls can be centrifuged through a linear gradient of 0 to 2m LiCl and 10 to 25% sucrose so that different autolysins are removed by different salt concentrations and banded in separate positions as the walls pass through the gradient. Using this technique we have found thatB. subtilis cell walls are isolated with two autolytic enzymes attached. One autolysin, a glycosidase, can be eluted from walls with 0.5m LiCl, has ap H optimum between 5 and 8, is relatively heat-sensitive, and has a molecular weight of 60,000. The other autolysin, an alanine amidase, can be eluted from walls with 1.5m LiCl, has ap H optimum around 8, is relatively heat-stable, has a molecular weight of 35,000, and is present in quantities ten times greater than the glycosidase.

journal of bacteriology

New Centrifugation Technique for Isolating Enzymes from Large Cell Structures: Isolation and Characterization of Two <i>Bacillus subtilis</i> Autolysins

New Centrifugation Technique for Isolating Enzymes from Large Cell Structures: Isolation and Characterization of Two Bacillus subtilis Autolysins