Team:LMU-Munich/Project

From 2012.igem.org

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=== Promoter Evaluation ===
=== Promoter Evaluation ===
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To get a set of promoters with different strength we chose several promoters. They can be divided in three different groups: the constitutive promoters from the Anderson collection from the partsregistry, the constitutive promoters P''liaG'', P''veg'' and P''lepA'' from ''B. subtilis'' as well as the inducible promoter P''liaI'' from ''B. subtilis''. For the characterization of the different promoters they were all cloned upstream of reporter genes (lux operon, lacZ) to measure their activity in ''B. subtilis'' by regarding the gene expression of the reporter gene.
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To get a set of promoters with different strength we chose several promoters. They can be divided in three different groups: the constitutive promoters from the [http://partsregistry.org/Part:BBa_J23100 Anderson collection] from the partsregistry, the constitutive promoters P''liaG'', P''veg'' and P''lepA'' from ''B. subtilis'' as well as the inducible promoter P''liaI'' from ''B. subtilis''. For the characterization of the different promoters they were all cloned upstream of reporter genes (lux operon, lacZ) to measure their activity in ''B. subtilis'' by regarding the gene expression of the reporter gene.
====Anderson promoters====
====Anderson promoters====
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The first group of promoters evaluated are the promoters of the Anderson collection which we call ''Anderson promoters''. They have already been measured in ''Escherichia coli'' and they all showed a constitutive behaviour but with a different strength. In this project these Anderson promoters were measured in ''B. subtilis''. As they have already been evaluated in ''E. coli'', they were already in the partsregistry in the vector where they are fused to the so-called ''Red fluorescent protein'' (RFP). For evaluation they were cut out of the vector and then first cloned in BioBrick standard in the empty vector pSB1C3 to send them to the registry. In addition eleven (J23100,J23101, J23102, J23103, J23106, J23107, J23113, J23114, J23115, J23117, J23118) of the nine-teen promoters of the Anderson collection were successfully cloned in the expression vector pSB<sub>Bs</sub>3C-<i>luxABCDE</i> from the BioBrickBox containing the ''lux'' operon as a reporter for promoter activity. The gene expression which correlates to the promoter activity leads to the expression of the ''lux'' operon with the luciferase. The luminescence which is produced by the luciferase can be measured with the plate reader (BioTek). To measure the activity not only with the lux reporter operon four promoters were cloned into the reporter vector pSB<sub>Bs</sub>1C-''lacZ'' to do beta-galactosidase assays and then to compare the results of the strength of these promoters in ''B. subtilis''.
+
The first group of promoters evaluated are the promoters of the Anderson collection which we call ''Anderson promoters''. They have already been measured in ''Escherichia coli'' and they all showed a constitutive behaviour but with a different strength. In this project, these Anderson promoters were measured in ''B. subtilis''. As they have already been evaluated in ''E. coli'', they were already in the partsregistry in the vector where they are fused to the ''Red fluorescent protein'' (RFP). For evaluation they were cut out of the vector and then first cloned in BioBrick standard in the empty vector pSB1C3 to send them to the registry. In addition, eleven (J23100,J23101, J23102, J23103, J23106, J23107, J23113, J23114, J23115, J23117, J23118) of the nineteen promoters of the Anderson collection were successfully cloned in the expression vector pSB<sub>Bs</sub>3C-<i>luxABCDE</i> from the BioBrickBox containing the ''lux'' operon as a reporter for promoter activity. The gene expression which correlates to the promoter activity leads to the expression of the ''lux'' operon with the luciferase. The luminescence which is produced by the luciferase can be measured with the plate reader (BioTek). To measure the activity not only with the lux reporter operon, four promoters were cloned into the reporter vector pSB<sub>Bs</sub>1C-''lacZ'' to do beta-galactosidase assays and then to compare the results of the strength of these promoters in ''B. subtilis''.
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====Inducible promoters from ''B. subtilis''====
====Inducible promoters from ''B. subtilis''====
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The last group of promoters consists of inducible promoters of ''B. subtilis'' e.g. P''<sub>liaI</sub>''. They are useful to decide when to turn on gene expression because these promoters need an inducer to start transcription. P''<sub>liaI</sub>'' can be induced by antibiotics which interact with the lipidII cycle, e.g. bacitracin. In this project this promoter is evaluated like the constitutive promoters with the reporter vector pSB<sub>Bs</sub>3C-<i>luxABCDE</i> which contains the ''lux'' operon as a reporter and with the vector pSB<sub>Bs</sub>1C-''lacZ'' which conatins the ''lacZ'' reporter gene. Therefore the promoters will be amplified from the genom of ''B. subtilis'' with primers that conatin the restriction sites of the BioBrick standard. Then these inducible promoters will be cloned into the empty vector pSB1C3 to send them to the registry as well as the two reporter vectors to evaluate their strength in ''B. subtilis''. To turn the promoter on we have to add an inducer.
+
The last group of promoters consists of inducible promoters of ''B. subtilis'' e.g. P''<sub>liaI</sub>''. They are useful to decide when to turn on gene expression because these promoters need an inducer to start transcription. P''<sub>liaI</sub>'' can be induced by antibiotics which interact with the lipidII cycle, e.g. bacitracin. In this project this promoter is evaluated like the constitutive promoters with the reporter vector pSB<sub>Bs</sub>3C-<i>luxABCDE</i> which contains the ''lux'' operon as a reporter and with the vector pSB<sub>Bs</sub>1C-''lacZ'' which conatins the ''lacZ'' reporter gene. Therefore the promoters will be amplified from the genom of ''B. subtilis'' with primers that conatain the restriction sites of the BioBrick standard. Then these inducible promoters will be cloned into the empty vector pSB1C3 to send them to the registry as well as the two reporter vectors to evaluate their strength in ''B. subtilis''. To turn the promoter on we have to add an inducer.

Revision as of 19:48, 20 August 2012

iGEM Ludwig-Maximilians-Universität München Beadzillus

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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".

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