Abstract
The acid extraction of the adenovirus type 5 core proteins V, VII, and pVII (the precursor to VII) from infected cells and the subsequent electrophoresis on a 15% acrylamide-2.5 M urea-0.9 N acetic acid (pH 2.7) gel, revealed that peptide VII has a similar electrophoretic mobility to that of histone H1. The core proteins, which are coded by late adenovirus mRNA, continued to be synthesized late in infection when viral DNA synthesis was inhibited either by cytosine arabinoside in wild-type infections or by shifting adenovirus H5 ts 125-infected cells to the nonpermissive temperature (40 degree C). Only the initiation, not the continuation, of viral DNA replication was essential for core protein synthesis. The synthesis of viral core proteins continued for over 8 h after the cassation of DNA synthesis. This was in contrast to the rapid shutdown of cellular histone synthesis in the absence of cellular DNA synthesis.
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