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The simian virus 40 (SV40) enhancer element is constituted of two domains which contain sequences important for late transcription (M. Ernoult-Lange, F. Omilli, D. O'Reilly and E. May, J. Virol. 61, 167-176, 1987). By analysing a series of clustered point mutations generated throughout the enhancer region we mapped domain I from nt 232 to 272 and domain II from nt 184 to 216. These two domains which are required for late promoter activity both in the presence and in the absence of T antigen correspond closely to the domains B and A respectively, identified for enhancer function (M. Zenke, T. Grundström, H. Matthes, M. Wintzerith, C. Schatz, A. Wildeman and P. Chambon, EMBO J., 5, 387-397, 1986). Similarly to the enhancer function the late promoter elements defined by these two domains contain multiple sequence motifs. Moreover there is a striking overlap between the sequence motifs within domain A, active for early enhancer function and those within domain II involved in efficient late transcription.

The sequence motifs that are involved in SV40 enhancer function also control SV40 late promoter activity