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lüll Small tumor antigen of polyomaviruses: role in viral life cycle and cell transformation Khalili K; Sariyer IK; Safak MJ Cell Physiol 2008[May]; 215 (2): 309-19The regulatory proteins of polyomaviruses, including small and large T antigens, play important roles, not only in the viral life cycle but also in virus-induced cell transformation. Unlike many other tumor viruses, the transforming proteins of polyomaviruses have no cellular homologs but rather exert their effects mostly by interacting with cellular proteins that control fundamental processes in the regulation of cell proliferation and the cell cycle. Thus, they have proven to be valuable tools to identify specific signaling pathways involved in tumor progression. Elucidation of these pathways using polyomavirus transforming proteins as tools is critically important in understanding fundamental regulatory mechanisms and hence to develop effective therapeutic strategies against cancer. In this short review, we will focus on the structural and functional features of one polyomavirus transforming protein, that is, the small t-antigen of the human neurotropic JC virus (JCV) and the simian virus, SV40.|Amino Acid Sequence[MESH]|Animals[MESH]|Antigens, Viral, Tumor/genetics/*physiology[MESH]|Cell Transformation, Viral/*physiology[MESH]|Humans[MESH]|JC Virus/immunology/*physiology[MESH]|Molecular Chaperones/physiology[MESH]|Molecular Sequence Data[MESH]|Protein Kinases/metabolism[MESH]|Protein Structure, Tertiary/physiology[MESH]|Reading Frames[MESH]|S Phase/physiology[MESH]|Simian virus 40/immunology/*physiology[MESH]|TOR Serine-Threonine Kinases[MESH]|Tumor Suppressor Protein p53/genetics/metabolism[MESH] |