Value 
2.7
nM

Organism 
Bacteria Escherichia coli 
Reference 
Bintu L, Buchler NE, Garcia HG, Gerland U, Hwa T, Kondev J, Kuhlman T, Phillips R. Transcriptional regulation by the numbers: applications. Curr Opin Genet Dev. 2005 Apr15(2):12535 fig 6bPubMed ID15797195

Primary Source 
Oehler S, Amouyal M, Kolkhof P, von WilckenBergmann B, MüllerHill B. Quality and position of the three lac operators of E. coli define efficiency of repression. EMBO J. 1994 Jul 1513(14):334855PubMed ID8045263

Method 
The expected foldchange is given by Case 1 (of Table 1 in companion article, pubmed id 15797194) , with [R] = [LacI4], KR = Km and only one unknown parameter, Km, characterizing the effective dissociation constant of the operator Om. Here, it is possible to compute Km directly from the experimental data of Oehler et al. (primary ref) 
Comments 
This mathematical model (see companion article pubmed id 15797194) obtained value differs significantly from the experimentally obtained in vitro value of 0.01 nM 
Entered by 
Uri M 
ID 
103596 