Interferon action—sequence specificity of the ppp(A2′p)nA-dependent ribonuclease

Abstract
The sequence specificities of the 2-5A-dependent RNases in extracts of rabbit reticulocytes, mouse ascites tumor cells and human lymphoblastoid cells were investigated in conditions of partial digestion using terminally labeled RNA substrates [La crosse virus and influenza virus genomes]. The enzymes cleaved on the 3''-side of UN sequences to yield UpNp terminated products. Cleavage was observed predominantly at UA and UU sequences.