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Ribosomal RNA (rRNA) in intact ribosomes is cleaved into discrete products on incubation of reticulocyte lysates or L-cell extracts with ppp(A2'p)3A. Cleavage of rRNA may, therefore, provide a useful assay for 2-5A (ppp)A2'p)nA; n = 2 to 4) or for the presence of a 2-5A-dependent nuclease. The results with reticulocyte lysates differed from those obtained in the L-cell-free system in that (a) a different RNA cleavage pattern was produced (with added L-cell ribosomes) and (b) cleavage was fully activated by the analogue ppp(A2'p)3A3'pCp. As might be expected from the relatively high levels of 2-5A present in interferon-treated, encephalomyocarditis virus (EMC)-infected L-cells, rRNA extracted from these cells was also cleaved. The cleavage pattern observed overlapped with that obtained on incubation of an L-cell-free system with 2-5A. Thus, not only is 2-5A present, but the 2-5A-dependent nuclease also appears to be active, in interferon-treated, EMC-infected L-cells.

Ribosomal RNA cleavage, nuclease activation and 2-5A (ppp(A2′p)nA) in interferon-treated cells

Ribosomal RNA cleavage, nuclease activation and 2-5A (ppp(A2′p)_nA) in interferon-treated cells