Part:BBa_R0061

Promoter (HSL-mediated luxR repressor)

This part involves the -10 binding site, the -35 binding site, and the twenty nucleotides between that constitute the lux box. With this part, LuxR functions as a acyl-homoserine lactone-dependent repressor. LuxR resonds to the HSL produced by LuxI, N-(3-oxohexanoyl)-HSL. The Lux box is positioned such that it partially overlaps the consensus -35 and -10 hexamers of an RNA polymerase binding site.

Usage and Biology

A quorum-sensing system involving LuxR, the transcriptional activator, and an acyl-homserine lactone signal regulate the lux operon in vibrio fischeri. In vibrio fischeri, the lux box, which is a 20-base inverted repeat unit, is positioned 42.5 bases upstream of the transcriptional start of the lux operon and is required for transcriptional activation. Egland and Greenberg constructed an artificial lacZ promoter with the lux box positioned between and overlapping the -35 and -10 hexamers of the RNA polymerase binding site was constructed, and LuxR functioned as an acyl-homoserine lactone-dependent repressor at this promoter. It was found that full-length LuxR by itself can bind to lux box-containing DNA. (see reference below)

Sequence and Features

Assembly Compatibility:

• 10
  COMPATIBLE WITH RFC[10]
• 12
  COMPATIBLE WITH RFC[12]
• 21
  COMPATIBLE WITH RFC[21]
• 23
  COMPATIBLE WITH RFC[23]
• 25
  COMPATIBLE WITH RFC[25]
• 1000
  COMPATIBLE WITH RFC[1000]

Functional Parameters

biology	-NA-
direction	Forward
negative_regulators	1
positive_regulators	-NA-