Difference between revisions of "Part:BBa K2273000"
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The most important promoter regulated by ComA and involved in competence development is the promoter of the <i>srfA</i> operon (P<sub><i>srfA</i></sub>). This operon contains not only genes for the production of the antibiotic surfactin <b>(e)</b> but also for ComS <b>(f)</b>, another small peptide that prevents the degradation of the autoregulated transcription factor ComK <b>(g)</b>. Since the promoter is not only dependent on quorum sensing but also on nutritional conditions, we evaluated the influence of different media (Figure 2). We tested full medium (LB) as well as minimal media (MNGE, MCSE).</p><figure style="padding-right:10%; padding-left:10%"><img style="width:80%" src="https://static.igem.org/mediawiki/parts/1/11/T--TU_Dresden--P_Communication_Psrf_Media.png"><figcaption><b>Figure 2: Growth (A) and promoter activity of P<sub><i><b>srfA</b></i></sub> (B) in different media.</b> Wild type (WT, pink) and <i>comX</i>-knockout strains (<i>ΔcomX</i>, dark blue) contain a P<sub><i>srfA</i></sub> <i>luxABCDE</i> fusion. </figcation></figure></figure> | The most important promoter regulated by ComA and involved in competence development is the promoter of the <i>srfA</i> operon (P<sub><i>srfA</i></sub>). This operon contains not only genes for the production of the antibiotic surfactin <b>(e)</b> but also for ComS <b>(f)</b>, another small peptide that prevents the degradation of the autoregulated transcription factor ComK <b>(g)</b>. Since the promoter is not only dependent on quorum sensing but also on nutritional conditions, we evaluated the influence of different media (Figure 2). We tested full medium (LB) as well as minimal media (MNGE, MCSE).</p><figure style="padding-right:10%; padding-left:10%"><img style="width:80%" src="https://static.igem.org/mediawiki/parts/1/11/T--TU_Dresden--P_Communication_Psrf_Media.png"><figcaption><b>Figure 2: Growth (A) and promoter activity of P<sub><i><b>srfA</b></i></sub> (B) in different media.</b> Wild type (WT, pink) and <i>comX</i>-knockout strains (<i>ΔcomX</i>, dark blue) contain a P<sub><i>srfA</i></sub> <i>luxABCDE</i> fusion. </figcation></figure></figure> | ||
| − | <p align="justify">Furthermore, we studied the influence of ComX-overproduction on the promoter activity by integrating an inducible copy of <i>comX<i>.</p> | + | <p align="justify">Furthermore, we studied the influence of ComX-overproduction on the promoter activity by integrating an inducible copy of <i>comX</i>.</p> |
| − | <figure style="padding-left:35%; padding-right:35%;"><img src="https://static.igem.org/mediawiki/parts/a/a3/T--TU_Dresden--P_Communication_Psrf_Induction.png" width="100%"><figcaption><b>Growth (A) and promoter activity of P<sub><i><b>srfA</b></i></sub> (B) in dependence of xylose-induction.</b> Wild type (WT, pink and light blue) and <i>comX</i>-knockout strain (Δ<i>comX</i>, black and dark blue) contain a P<sub><i>srfA</i></sub>- <i>luxABCDE</i>fusion. After 1 hour of incubation (dashed line) the cultures were induced with 1% xylose (light blue and black) or with distilled water (dH2O, pink and dark blue).</figcation></figure> | + | <figure style="padding-left:35%; padding-right:35%;"><img src="https://static.igem.org/mediawiki/parts/a/a3/T--TU_Dresden--P_Communication_Psrf_Induction.png" width="100%"><figcaption align="justify"><b>Growth (A) and promoter activity of P<sub><i><b>srfA</b></i></sub> (B) in dependence of xylose-induction.</b> Wild type (WT, pink and light blue) and <i>comX</i>-knockout strain (Δ<i>comX</i>, black and dark blue) contain a P<sub><i>srfA</i></sub>- <i>luxABCDE</i>fusion. After 1 hour of incubation (dashed line) the cultures were induced with 1% xylose (light blue and black) or with distilled water (dH2O, pink and dark blue).</figcation></figure> |
<b>The promoter was created and used by <a target="_blank" href="http://2017.igem.org/Team:TU_Dresden/Project/Communication">TU Dresden iGEM team</a></b> | <b>The promoter was created and used by <a target="_blank" href="http://2017.igem.org/Team:TU_Dresden/Project/Communication">TU Dresden iGEM team</a></b> | ||
Revision as of 20:03, 30 October 2017
PsrfA: a ComA-dependent promoter of Bacillus subtilis
Usage and Biology
This promoter is controlled by the well-studied regulatory system for competence development in Bacillus subtilis (Figure 1).
B. subtilis constantly secretes the ComX pheromone (BBa_K2273000), a 9- to 10-amino acid oligopeptide, as a signalling molecule (a). By rising cell-density, the ComX-concentration in the surrounding medium increases until it reaches a threshold and activates ComP, a membrane-spanning protein kinase (b). This mechanism is called quorum sensing.
The kinase reacts to the accumulation of ComX by phosphorylating the response regulator ComA (c) which then works as a transcription factor by binding to several promoters and enhancing their activity (d).
The most important promoter regulated by ComA and involved in competence development is the promoter of the srfA operon (PsrfA). This operon contains not only genes for the production of the antibiotic surfactin (e) but also for ComS (f), another small peptide that prevents the degradation of the autoregulated transcription factor ComK (g). Since the promoter is not only dependent on quorum sensing but also on nutritional conditions, we evaluated the influence of different media (Figure 2). We tested full medium (LB) as well as minimal media (MNGE, MCSE).
Furthermore, we studied the influence of ComX-overproduction on the promoter activity by integrating an inducible copy of comX.
Sequence and Features
- 10COMPATIBLE WITH RFC[10]
- 12COMPATIBLE WITH RFC[12]
- 21COMPATIBLE WITH RFC[21]
- 23COMPATIBLE WITH RFC[23]
- 25COMPATIBLE WITH RFC[25]
- 1000COMPATIBLE WITH RFC[1000]