Could be a lytic transglycosylase. Required for spore cortex hydrolysis during germination. Interacts strongly but noncovalently with spore components. Expressed in the forespore and then transported across the inner forespore membrane and deposited on the outside of the cortex. Expressed during sporulation and active during germination. Exists as mature but inactive form in the dormant spore. Expression is sigma G-dependent. B.subtilis SleB could not be detected with anti-B.cereus SleB antiserum and vice versa. Belongs to the SleB family.