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Arginine incorporation into proteins by supernatant fractions of rat liver and Novikoff hepatoma.

Summary The rat liver cell soluble fraction can incorporate arginine into proteins in absence of ribosomes. A similar system from Novikoff hepatoma is described. General properties of the tumor system were found to be the same as those of normal rat liver: arginine was specifically incorporated, arginyl-tRNA was an intermediate in the transfer of arginine to acceptor proteins, and the incorporated arginine had a free amino group. However, due to the high arginase content of normal rat liver and the absence of this enzyme in Novikoff hepatoma, the incorporation of arginine into proteins could reach, in vitro , a much higher level in tumor supernatant.