Rate of isomerization from closed to open complex (Kf) of RNAP at lac UV5 promoter

Range 0.012-0.11 Table - link sec^-1
Organism Bacteria Escherichia coli
Reference Buc H, McClure WR. Kinetics of open complex formation between Escherichia coli RNA polymerase and the lac UV5 promoter. Evidence for a sequential mechanism involving three steps. Biochemistry. 1985 May 21 24(11):2712-23. p.2717 table IIPubMed ID3896304
Method Abortive Initiation Assays-In the absence of a complete complement of nucleoside triphosphates, RNA polymerase synthesizes the tetranucleotide ApApUpU at the UV5 promoter. For the activity assays, the number of moles to ApApUpU produced per mole of promoter was determined as a function of the reaction time t under three different conditions. KB and kf were obtained from Tau (average time necessary for open complex formation) plots
Comments The forward and reverse kinetics of open complex formation between Escherichia coli RNA polymerase and the lac UV5 promoter have been studied in the temperature range of 15-42°C. 0.012sec^-1 for 19°C. 0.11sec^-1 for 45°C
Entered by Uri M
ID 105132