Probable N-acetylmuramyl-L-alanine amidase. Required for spore cortex hydrolysis during germination. May form a complex with some hydrophobic spore component, leading to a stabilization of the enzyme in a spore-bound form (By similarity). Expressed in the forespore and then transported across the inner forespore membrane and deposited on the outside of the cortex. Belongs to the SleB family.