Toxic component of a type II toxin-antitoxin (TA) system. An RNase (By similarity). Upon expression in M.smegmatis inhibits translation and colony formation. Its toxic effect on colony formation is neutralized by coexpression with cognate antitoxin VapB22; the effect on translation has not been tested but is probably neutralized also. Following 6 weeks of nutrient starvation. Belongs to the PINc/VapC protein family.