Antitoxin component of a type II toxin-antitoxin (TA) system. Upon expression in M.smegmatis neutralizes the effect of cognate toxin VapC2. The C-terminal helix of the antitoxin may obstruct the toxin's RNA-binding groove, blocking access to the active sites. Additionally, the C-terminal arginine of the antitoxin may remove Mg(2+) ions from the toxin active sites. Forms a homodimer, which binds to a toxin homodimer, which then oligomerizes further to a hetero-octamer. When bound to toxin VapC2 the toxin activity is inhibited; 1 antitoxin may suffice to inhibit toxin.