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. 1980 Apr;34(1):213–224. doi: 10.1128/jvi.34.1.213-224.1980

Association of a murine 53,000-dalton phosphoprotein with simian virus 40 large-T antigen in transformed cells.

F McCormick, E Harlow
PMCID: PMC288687  PMID: 6246255

Abstract

Serum raised against a mouse 53,000-dalton (53K) phosphoprotein precipitates both the 53K immunogen and simian virus 40 large-T from lysates of simian virus 40-transformed 3T3 cells. This serum, designated F5, does not recognize antigenic determinants on native or denatured large-T and precipitates large-T because the 53K phosphoprotein forms a stable complex with large-T. This complex sediments at 23S on sucrose density gradients, corresponding to a molecular weight of 600K to 1,000K, and appears to contain only 53K and large-T as major components. It is held together by noncovalent bonds and is located in the cell nucleus. All the 53K immunoprecipitated from cell lysates by F5 is present in the high-molecular-weight complex, but large-T can be separated into a complexed and a free form on sucrose density gradients. The complexed form of large-T is more readily phosphorylated than the free form. We have been unable to detect an association of large-T with comparable host cell proteins during productive infections with simian virus 40.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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