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JBC, Vol. 254, Issue 23, 12034-12037, Dec, 1979

2',5'-Oligoadenylate synthetase activity in lymphocytes from normal mouse

N. Shimizu and Y. Sokawa

The activity of 2',5'-oligoadenylate synthetase, an enzyme recently discovered in interferon-treated cells, was found in lymphocytes from normal mouse spleen that had received neither exogenous interferon nor its inducers. The oligoadenylate synthesized by lymphocyte cell extracts inhibited protein synthesis in rabbit reticulocyte lysates. The oligomers were composed mainly of trimer and were resistant to digestion by T2 ribonuclease. The level of the enzyme in lymphocytes was about 20 to 30% of that in L929 cells treated with interferon. The activity of the enzyme was further enhanced in lymphocytes in vitro by addition of interferon. The 2',5'-oligoadenylate synthetase was distributed among several lymphoid tissues, but was not detected in cell extracts from brain or liver. The enzyme may play an important role in the regulation of the immune system.
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