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Updated: Jan 10, 2026
Nephrotic Syndrome I : Introduction
Published on: June 19, 2025
Long-range interaction between two promoters: activation of the leu-500 promoter by a distant upstream promoter
1Department of Pharmacology, School of Medicine, Wayne State University, Detroit, Michigan 48201, USA.
Abstract:
The leu-500 mutation can be suppressed in S. typhimurium topA. Previous studies have demonstrated that the plasmid-borne leu-500 minimal promoter cannot be activated in topA mutants unless adjacent (< 250 bp) transcription occurs away from the leu-500 promoter (short-range promoter interaction). To search for a potential upstream promoter responsible for activation of leu-500 in the chromosomal context, we have identified the ilvlH promoter, located 1.9 kb upstream of leu-500 (long-range promoter interaction). Different from short-range promoter interaction, which is abolished by DNA sequence insertions, the long-range promoter interaction is mediated by the intervening DNA sequence. These studies suggest that the long-range interaction between a pair of divergently arrayed promoters is probably mediated by a complex process involving relay of DNA supercoiling by the DNA sequence located between the two promoters.
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