Send to

Choose Destination
J Gen Virol. 2009 May;90(Pt 5):1238-45. doi: 10.1099/vir.0.009159-0. Epub 2009 Mar 4.

A truncated T antigen expressed from an alternatively spliced BK virus early mRNA.

Author information

Department of Microbiology and Immunology and Comprehensive Cancer Center, University of Michigan Medical School, Ann Arbor, MI 48109-5942, USA.


The early region of BK virus (BKV) is known to encode two well-characterized tumour (T) antigens, large T antigen (TAg) and small T antigen (tAg). In this study, we provide evidence of a third early BKV mRNA that codes for an additional early region product with an apparent molecular mass of 17-20 kDa. This truncated form of TAg (truncTAg) is expressed from an alternatively spliced mRNA that is derived from the excision of a second intron from the mRNA encoding TAg. The first 133 aa of truncTAg are identical to those of TAg but the additional splice results in translation from a different reading frame, adding three new amino acids before reaching a stop codon. TruncTAg is expressed in both BKV-transformed and lytically infected cells and it is found to be primarily localized to the nucleus. The function of BKV truncTAg is likely to be relevant to transformation, similar to the additional T antigens of simian virus 40, JC virus and mouse polyomavirus.

[Indexed for MEDLINE]
Free PMC Article

Supplemental Content

Full text links

Icon for Ingenta plc Icon for PubMed Central
Loading ...
Support Center