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We have used yeast strains containing a disrupted positive (GAL4) and/or a disrupted negative (GAL80) regulatory gene to investigate the relationship of these regulatory proteins to the hypersensitive sites upstream of their target genes, GAL1-10. We find that neither of these regulatory proteins is required for the formation of the hypersensitive region. There is positive regulatory protein (dependent) binding to a portion of the hypersensitive region when GAL1 and 10 are expressed. However, similar binding can also occur under conditions in which the genes are not expressed. Thus, such binding is necessary but not sufficient for expression of GAL1 and 10 and control of GAL1-10 expression must also include processes which occur subsequent to GAL4/DNA binding. The negative regulatory protein GAL80 plays a significant role in these processes.

The relationship of regulatory proteins and DNase I hypersensitive sites in the yeastGAL1-10genes