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. 1974 Sep;14(3):412–420. doi: 10.1128/jvi.14.3.412-420.1974

Adenovirus DNA Replication I. Requirement for Protein Synthesis and Isolation of Nuclear Membrane Fractions Containing Newly Synthesized Viral DNA and Proteins

Tadashi Yamashita a,1, Maurice Green a
PMCID: PMC355532  PMID: 4850436

Abstract

Nuclear membrane fractions were prepared by two procedures from KB cells pulse labeled with [3H]thymidine for 5 min late after infection with adenovirus 2: (i) the M-band technique, which yields a sharp peak containing most of the newly synthesized viral DNA, and (ii) the discontinuous sucrose gradient method, which yields three membrane fractions, one which bands at the interface between sucrose layers at density 1.18 and 1.20 g/ml and contains most of the newly synthesized viral DNA. Studies using cycloheximide to inhibit protein synthesis showed that proteins whose synthesis begins early after infection and occurs in the absence of viral DNA replication are required for viral DNA synthesis late after infection. To study the nature of these proteins, nuclear membrane fractions were isolated from cells labeled with [3H]leucine from 6 to 24 h postinfection in the presence of arabinosyl cytosine to block viral DNA replication, and were analyzed by electrophoresis in sodium dodecyl sulfate polyacrylamide gels. Two proteins of molecular weights 75,000 and 45,000 were the major labeled polypeptides in the nuclear membrane fractions prepared from infected cells both by the M-band and the discontinuous sucrose gradient methods. These two proteins were not found in nuclear membrane fractions from uninfected cells. It is suggested that the 75,000 and 45,000 proteins may be early viral gene products that may play a role in the viral DNA replication.

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Selected References

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