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In abortive infections of monkey cells by Ad2+ND5, the synthesis of the simian virus 40-specific 42,000-molecular-weight (42K) protein was reduced approximately 10-fold compared with a productive coinfection by Ad2+ND5 plus Ad2hr400 and about 20-fold compared with productive infections by Ad2+ND5 plus simian virus 40 or by Ad2+ND2 alone. However, the level of Ad2+ND5-specific mRNA was depressed twofold or less in abortive infections compared with productive infections. Moreover, the 42K mRNA isolated from abortive Ad2+ND5 infections translated in vitro with the same efficiency as the mRNA isolated from productive coinfections. This is analogous to the block to synthesis of the adenovirus fiber polypeptide in monkey cells (Anderson and Klessig, J. Mol. Appl. Genet. 2:31-43, 1983). Also like fiber protein, the increased level of the 42K protein found in productive infections was due to enhanced synthesis, not increased stability of the protein. Our results suggest that the synthesis of the Ad2+ND5-specified 42K protein and the adenovirus fiber protein are regulated in similar posttranscriptional manners.

Synthesis of the Ad2+ND5-specified 42K protein is regulated posttranscriptionally in abortively infected monkey cells