"
Team:LMU-Munich/Data/Anderson
From 2012.igem.org
| Line 8: | Line 8: | ||
===Anderson Promoters=== | ===Anderson Promoters=== | ||
| - | |||
<br> | <br> | ||
| + | ===Luminescence measurements=== | ||
| + | |||
<p align="justify"> | <p align="justify"> | ||
Eleven of the nineteen promoters of the [http://partsregistry.org/Part:BBa_J23100 '''Anderson collection'''] (J23100, J23101, J23102, J23103, J23106, J23107, J23113, J23114, J23115, J23117, J23118) were evaluated. Therefore, we used the reporter vector pSB<sub>''Bs''</sub>3C-''luxABCDE'' from the BioBrickBox containing the ''lux'' operon [[File:Lux operon.png|100px]] as a reporter for promoter activity. The promoter activity leads to the expression of the ''lux'' operon and to the production of the enzyme luciferase. The luminescence, which is produced by the luciferase, can be measured with the plate reader ''Synergy2'' (BioTek) ('''Fig.1''').</p> | Eleven of the nineteen promoters of the [http://partsregistry.org/Part:BBa_J23100 '''Anderson collection'''] (J23100, J23101, J23102, J23103, J23106, J23107, J23113, J23114, J23115, J23117, J23118) were evaluated. Therefore, we used the reporter vector pSB<sub>''Bs''</sub>3C-''luxABCDE'' from the BioBrickBox containing the ''lux'' operon [[File:Lux operon.png|100px]] as a reporter for promoter activity. The promoter activity leads to the expression of the ''lux'' operon and to the production of the enzyme luciferase. The luminescence, which is produced by the luciferase, can be measured with the plate reader ''Synergy2'' (BioTek) ('''Fig.1''').</p> | ||
Revision as of 17:19, 25 September 2012
The LMU-Munich team is exuberantly happy about the great success at the World Championship Jamboree in Boston. Our project Beadzillus finished 4th and won the prize for the "Best Wiki" (with Slovenia) and "Best New Application Project".
[ more news ]
Anderson Promoters
Luminescence measurements
Eleven of the nineteen promoters of the [http://partsregistry.org/Part:BBa_J23100 Anderson collection] (J23100, J23101, J23102, J23103, J23106, J23107, J23113, J23114, J23115, J23117, J23118) were evaluated. Therefore, we used the reporter vector pSBBs3C-luxABCDE from the BioBrickBox containing the lux operon 
as a reporter for promoter activity. The promoter activity leads to the expression of the lux operon and to the production of the enzyme luciferase. The luminescence, which is produced by the luciferase, can be measured with the plate reader Synergy2 (BioTek) (Fig.1).
|
All clones show a usual growth behaviour. The activity of the promoters increases during transition from log to stationary phase. The maximum (t=1h) reaches from 200Lumi/OD600 (promoter J23115) to a maximum of 1500 Lumi/OD600 for the strongest promoter (J23101). Afterwards the activity goes down to the beginning level (t=2h). The oscillation of luminescence (Lumi/OD600) in the beginning of the curves are due to the small OD600 values and do not mean high promoter activity. One clone of J23107 and J23114 shows significantly lower promoter activity. Therefore, additional clones should be measured. In comparison to all the other evaluated Bacillus promoters, these Anderson promoters showed a very low acitivity in B. subtilis.
β-galactosidase assay
To evaluate the activity not only with the lux reporter operon, four promoters of the Anderson collection were cloned into the reporter vector pSBBs1C-lacZ 
to do β-galactosidase assays and then to compare the results of the strength of these promoters in B. subtilis (Fig. 2). The results were compared to the results from the luminescence measurements.
|
In this result at least some of the Anderson promoters do not seem so weak as in the results of the luminescence measurements (Fig. 1). This experiment should be repeated where we measure a constitutive promoter e.g. PliaG in the same experiment. The luminescence measurements are in this case more reliable because they were repeated three times with two independent clones.
