Difference between revisions of "Part:BBa K823000"

Revision as of 11:14, 22 September 2012

P_liaG

Promoter of the liaG gene of Bacillus subtilis, weak constitutive.

Usage and Biology

P_liaG is a weak, constitutive promoter from B. subtilis. It is responsible for the transcription of the last four genes of the liaIHGFSR locus and therefore for the production of the components of the LiaRS system, which is important for the detection of cell wall antibiotics [http://www.ncbi.nlm.nih.gov/pubmed?term=Journal%20of%20Bacteriology%2C%20188%20%2814%29%3A%205153%E2%80%935166: (Jordan et al., 2006)]. P_liaG was evaluated with the lux operon as an reporter as well as the reporter gene lacZ. For more Details visit the [http://2012.igem.org/Team:LMU-Munich/Data Data] page of the LMU-Munich Team 2012 .

Evaluation

β-galactosidase assay and growth curve of strains carrying the promoters P_liaG (black) and P_veg (grey) fused to lacZ. β-galactosidase activity (Miller Units)and the growth curve values are the average of two independant clones with their standard deviation that were measured during the same experiment. Experiment shows representative data which was obtained in the same way from three independent experiments.

The two constitutive promoters P_liaG and P_veg were evaluated with the reporter lacZ. Promoter activity leads to the expression of the β-galactosidase which directly correlates to the promoter activity. The β-galactosidase assay of the constitutive Bacillus promoters P_veg and P_liaG was repeated three times. Data show one representative result. In the beginning of the growth curve both promoters show only low activity. But then it increases to a maximum before it decreases to the begininng level after about seven hours (Data not shown). Summing up the course of activity of both promoters P_veg and P_liaG is very similar based on the growth curve. The highest β-galactosidase activity and therefore the highest activity of the promoter P_veg with a maximum of 65 Miller units can be found during the transition from the logarithmic to the stationary phase. This is about five times higher than the acitivity of the promoter P_liaG with a maximum activity of about 12 Miller Units.

Sequence and Features