Probably the toxic component of a type II toxin-antitoxin (TA) system. An RNase (By similarity). Its cognate antitoxin is VapB27. Interacts with cognate antitoxin VapB27. Following 6 weeks of nutrient starvation. Belongs to the PINc/VapC protein family. Bioinformatics programs predicts this could have a signal sequence.