This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Reprints and Permissions Copyright Information Books from ASM Press MicrobeWorld Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Simmons, D T Search for Related Content PubMed PubMed Citation Articles by Simmons, D T

 Previous Article  |  Next Article 

J Virol. 1986 March; 57(3): 776-785

DNA-binding region of the simian virus 40 tumor antigen.

ABSTRACT

The simian virus 40 (SV40) tumor (T) antigen was purified by immunoaffinity chromatography and cleaved with small amounts of trypsin, and the resulting fragments were subjected to SV40 DNA cellulose chromatography. A 44,000-molecular-weight fragment (44K fragment) from the left end of the molecule and a 30K fragment mapping from approximately Lys 131 to Lys 371 bound to the column and were eluted with 1 M NaCl. In a second series of experiments, T antigen was immunoprecipitated with hamster anti-T serum or various monoclonal antibodies and partially digested with trypsin. Fragments that were solubilized by this treatment were tested for DNA-binding activity by using an SV40 DNA fragment-binding assay. A 17K fragment which originated from the amino-terminal region of the polypeptide had no apparent binding activity in this assay. On the other hand, larger fragments (76K, 46K, and 30K) whose amino termini were mapped around Lys 131 did display DNA-binding activity. Finally, complexes consisting of SV40 DNA and T-antigen fragments were precipitated in the DNA-binding assay with monoclonal antibodies that recognize the central region of the protein; however, antibodies with specificities to the amino- or carboxy-terminal regions were inactive. These results strongly suggest that the DNA-binding region of T antigen lies approximately between Lys 131 and Lys 371, corresponding to 0.51 and 0.37 map units on the DNA.

This article has been cited by other articles:

• Jiao, J., Simmons, D. T. (2003). Nonspecific Double-Stranded DNA Binding Activity of Simian Virus 40 Large T Antigen Is Involved in Melting and Unwinding of the Origin. J. Virol. 77: 12720-12728 [Abstract] [Full Text]  
• Gai, D., Roy, R., Wu, C., Simmons, D. T. (2000). Topoisomerase I Associates Specifically with Simian Virus 40 Large-T-Antigen Double Hexamer-Origin Complexes. J. Virol. 74: 5224-5232 [Abstract] [Full Text]  
• Campbell, K S, Mullane, K P, Aksoy, I A, Stubdal, H, Zalvide, J, Pipas, J M, Silver, P A, Roberts, T M, Schaffhausen, B S, DeCaprio, J A (1997). DnaJ/hsp40 chaperone domain of SV40 large T antigen promotes efficient viral DNA replication.. Genes Dev. 11: 1098-1110 [Abstract]