Abstract
DNase I footprinting experiments showed that binding activities of Sp1 and of GHF-1 to its distal site on the human growth hormone gene promoter are mutually exclusive. The kinetics of GHF-1 binding were indicative of positive cooperativity. The Sp1 site did not affect promoter activity in cell-free transcription. Still, Sp1 could compensate partially for the decreased stimulation of transcription seen at low GHF-1 concentrations.
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