Regulatory

Part:BBa_K823003

Designed by: Korinna Kraft   Group: iGEM12_LMU-Munich   (2012-07-16)

Pveg

Pveg is a strong, constitutive promoter of Bacillus subtilis.


Usage and Biology


Pveg is known to show a strong constitutive activity during the vegetative growth phase and sporulation. This promoter is important for the transcription of the veg gene, which plays a role during sporulation (Fukushima et al., 2003). Pveg was measured by using the reporter gene lacZ. For more Details visit the Data of the constitutive promoters of the LMU-Munich Team 2012 or get an overview of our whole project Beadzillus.


Evaluation


This part was also evaluated in the publication The Bacillus BioBrick Box: generation and evaluation of essential genetic building blocks for standardized work with Bacillus subtilis by Radeck et al..

β-galactosidase assay


The two constitutive promoters PliaG and Pveg were evaluated with the reporter vector pSBBs1C-lacZ which contains the lacZ reporter gene (Fig.1).


Englisch Auswertung PliaG Pveg.png

Fig. 1: β-galactosidase assay and growth curve of strains carrying the promoters PliaG (black) and Pveg (grey) fused to lacZ. β-galactosidase activity (Miller Units) and the growth curve values are the average of two independent clones with their standard deviation. Experiment shows representative data from three independent experiments.


Promoter activity leads to the expression of the β-galactosidase. The β-galactosidase assay of the constitutive Bacillus promoters Pveg and PliaG was repeated three times. The graph shows data of one representative experiment. In the beginning of the growth curve both promoters show only low activity before 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 Pveg and PliaG is very similar based on the growth curve. The highest β-galactosidase activity and therefore the highest activity of the promoter Pveg 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 PliaG with a maximum activity of about 12 Miller Units.



Sequence and Features

This part was amplified from the genom of B. subtilis.

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]


[edit]
Categories
//chassis/prokaryote/bsubtilis
//promoter
//regulation/constitutive
//rnap/prokaryote/subtilis/sigmaa
Parameters
None