DNA MELTING ON YEAST RNA POLYMERASE-II PROMOTERS

Transcription-dependent DNA melting on the yeast GAL1 and GAL10 promot ers was found to be more closely correlated with the TATA box than the transcription start site. On both these genes, melting begins about 2 0 base pairs downstream of the TATA box. Physical and genetic analyses suggest that RNA polymerase II associates with this region. Thus, the distance between promoter melting and the TATA box in yeast may be si milar to that in higher eukaryotes, even though transcription initiate s in a region about 10 to 90 base pairs farther downstream in yeast.