Probable toxic component of a putative type VII toxin-antitoxin (TA) system, probably an RNase. Probably neutralized by cognate antitoxin TTE0751. Neutralization may be due to AMPylation by TTE0751. Homodimer, probably forms a complex with cognate antitoxin TTE0751. Modified by cognate antitoxin TTE0751; probably at least 2 successive AMPylation events occur on Tyr-81. Belongs to the HepT RNase toxin family.