Component of antiviral defense system Zorya type II, composed of ZorA, ZorB and ZorE. Expression of Zorya type II in E.coli (strain MG1655) confers resistance to phages SECphi7 and T7. While most T7 infected Zorya-containing cells undergo abortive infection, a minority produce viable phage progeny. These eventually accumulate to a high multiplicity of infection, leading to culture collapse by 170 minutes after initial infection (PubMed:29371424). ZorA and ZorB probably assemble in the cell inner membrane and exert their effect there. This may be a nuclease (Probable).