Difference between revisions of "Part:BBa K2507013"

Latest revision as of 13:19, 1 November 2017

J23109-ttrR-PttrB185-sfGFP

Usage and Biology

E. coli-codon-optimized TtrS(BBa_K2507002) and TtrR (BBa_K2507003) are two basic parts which are derived from the two-component system of the marine bacterium Shewanella baltica. TtrS is the membrane-bound sensor kinase (SK) which can sense tetrathionate outside the cell, and TtrR is the DNA-binding response regulator (RR). PttrB185-269 (BBa_K2507019) is a minimal TtrR-activated promoter which is activated when TtrR is phosphorylated by TtrS after TtrS senses tetrathionate.

Winter et al. have shown that reactive oxygen species (ROS) produced by the host during inflammation convert thiosulfate into tetrathionate, which this pathogen consumes to establish a beachhead for infection (Winter et al, 2010). Thus, tetrathionate may correlate with pro-inflammatory conditions and can therefore be used as a sensor for intestinal inflammation.

Sequence and Features

Assembly Compatibility:

10
COMPATIBLE WITH RFC[10]
12
INCOMPATIBLE WITH RFC[12]
Illegal NheI site found at 11
Illegal NheI site found at 34
21
COMPATIBLE WITH RFC[21]
23
COMPATIBLE WITH RFC[23]
25
INCOMPATIBLE WITH RFC[25]
Illegal AgeI site found at 318
1000
INCOMPATIBLE WITH RFC[1000]
Illegal SapI.rc site found at 1063

Characterization

We first validated that this system can function as a tetrathionate sensor and reporter in the laboratory strains Escherichia coli Top10 and E. coli Nissle 1917.

Figure1

Figure 1. Schematic diagram of ligand-induced signaling through TtrS/R and plasmid-borne implementation of the sensor components. TtrS/R was tested with BBa_K2507006 integrated into the pSB4K5 backbone and BBa_K2507013 into the pSB1C3 backbone. We submitted all parts to the iGEM registry in pSB1C3.

Figure2

Figure 2. As a result, the Tetrathionate system does not work well.

Figure3

Figure3. We cultivated E. coli Nissle 1917 overnight under aerobic or anaerobic conditions. Ths/R-sfGFP seems to act better under anaerobic conditions. However, TtrS/R-sfGFP performed much worse than ThsS/R. We therefore replaced the gfp gene in the TtrS/R system, with the vioABDE operon (BBa_K2507017). It worked better. So in TtrS/R system, we replaced gfp gene by vioABDE(BBa_K2507017). It worked better.

Reference

Daeffler, K. N., Galley, J. D., Sheth, R. U., Ortiz‐Velez, L. C., Bibb, C. O., & Shroyer, N. F., et al. (2017). Engineering bacterial thiosulfate and tetrathionate sensors for detecting gut inflammation. Molecular Systems Biology, 13(4), 923.

@@ Line 4: / Line 4: @@
 ==Usage and Biology==
-E.coli codon optimized TtrS(BBa_K2507002) and TtrR(BBa_K2507003) are two basic parts which belong to the two-component system from marine Shewanella baltica. TtrS is the membrane-bound sensor kinase(SK) which can sense tetrathionate outside the cell and TtrR is the DNA-binding response regulator(RR).PttrB185-269 (BBa_K2507019) is a minimal TtrR activated promoter when TtrR is phosphorylated by TtrS after TtrS sensing tetrathionate.
+<i>E. coli</i>-codon-optimized TtrS(BBa_K2507002) and TtrR (BBa_K2507003) are two basic parts which are derived from the two-component system of the marine bacterium <i>Shewanella baltica.</i> TtrS is the membrane-bound sensor kinase (SK) which can sense tetrathionate outside the cell, and TtrR is the DNA-binding response regulator (RR). PttrB185-269 (BBa_K2507019) is a minimal TtrR-activated promoter which is activated when TtrR is phosphorylated by TtrS after TtrS senses tetrathionate.
-Winter et.al have shown that reactive oxygen species (ROS) produced by the host during inflammation convert thiosulfate to tetrathionate, which this pathogen consumes to establish a startpoint for infection (Winter et al, 2010).Thus, tetrathionate may correlate with pro-inflammation conditions and can be used as gut inflammation sensor.
+Winter et al. have shown that reactive oxygen species (ROS) produced by the host during inflammation convert thiosulfate into tetrathionate, which this pathogen consumes to establish a beachhead for infection (Winter et al, 2010). Thus, tetrathionate may correlate with pro-inflammatory conditions and can therefore be used as a sensor for intestinal inflammation.
 <!-- Add more about the biology of this part here
 ===Usage and Biology===
@@ Line 16: / Line 18: @@
 ==Characterization==
-After validate this system in laboratory Escherichia coli Top10 and E.coli Nissle 1917, this system can function as a tetrathionate sensor and reporter.
+We first validated that this system can function as a tetrathionate sensor and reporter in the laboratory strains <i>Escherichia coli</i> Top10 and <i>E. coli</i> Nissle 1917.
-Figure 1. Schematic of ligand-induced signaling through TtrS/R and plasmid design of the sensor components. TtrS/R were tested under the situation BBa_K2507006 was in pSB4K5 backbone and BBa_K2507013 was in pSB1C3 backbone. We submitted the parts all to the iGEM registry in pSB1C3.
+[[File: SHSBNU 17 40a14.jpg|600px|thumb|center|Figure1]]
-图2
+Figure 1. Schematic diagram of ligand-induced signaling through TtrS/R and plasmid-borne implementation of the sensor components. TtrS/R was tested with BBa_K2507006 integrated into the pSB4K5 backbone and BBa_K2507013 into the pSB1C3 backbone. We submitted all parts to the iGEM registry in pSB1C3.
+[[File: SHSBNU 17 40a23.jpg|600px|thumb|center|Figure2]]
+Figure 2. As a result, the Tetrathionate system does not work well.
+[[File: SHSBNU 17 40a24.jpeg|600px|thumb|center|Figure3]]
+Figure3. We cultivated <i>E. coli</i> Nissle 1917 overnight under aerobic or anaerobic conditions. Ths/R-sfGFP seems to act better under anaerobic conditions. However, TtrS/R-sfGFP performed much worse than ThsS/R. We therefore replaced the <i>gfp</i> gene in the TtrS/R system, with the <i>vioABDE</i> operon (BBa_K2507017). It worked better.
+So in TtrS/R system, we replaced <i>gfp</i> gene by <i>vioABDE</i>(BBa_K2507017). It worked better.
 ==Reference==