Difference between revisions of "Part:BBa K1412010:Experience"

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''E.coli'' make use of the EnvZ/OmpR system to mediate signal transduction in response to environmental osmolarity changes. EnvZ, a histidine kinase, undergoes trans-autophosphorylation, then the high energy phosphoryl group is subsequently transferred to OmpR, a response regulator.
 
''E.coli'' make use of the EnvZ/OmpR system to mediate signal transduction in response to environmental osmolarity changes. EnvZ, a histidine kinase, undergoes trans-autophosphorylation, then the high energy phosphoryl group is subsequently transferred to OmpR, a response regulator.
 
In the system, OmpR-controlled promoter (PompC) is involved in. The expression strength of PompC is depending upon the medium osmolarity. When medium osmolarity is increasing, the EnvZ will phosphorylate more OmpR into phosphorylated OmpR (OmpR-P), and more OmpR-P will result in stronger expression strength of PompC. In our circuitry design, ''CheZ'' is upstream regulated by PompC. As the osmotic pressure is increasing, the motile ability of the engineered E.coli keeps growing, resulting in it's suicide.
 
In the system, OmpR-controlled promoter (PompC) is involved in. The expression strength of PompC is depending upon the medium osmolarity. When medium osmolarity is increasing, the EnvZ will phosphorylate more OmpR into phosphorylated OmpR (OmpR-P), and more OmpR-P will result in stronger expression strength of PompC. In our circuitry design, ''CheZ'' is upstream regulated by PompC. As the osmotic pressure is increasing, the motile ability of the engineered E.coli keeps growing, resulting in it's suicide.
 +
 +
We use semi-solid medium culture with gradient concentration of sucrose to characterize the device (BBa_K1412010). Setting the motile ability is proportional to the moving radius. From the plot, when no sucrose added in, the motile ability is the weakest. The motile ability keeps growing while the concentration of sucrose increased from 0 to 4%. Then the motile ability went down slightly as the sucrose concentration increased from 4% to 10%, but is still stronger than that at concentration 0. We can make the conclusion that our device is working as expectation, the motile ability went down because of the inhibition from hyperosmotic pressure. Besides, for even at the inhibiting osmotic pressure, the motile ability is still stronger than that without any inducer, reprogrammed CL-1 may even swim to killing osmotic pressure which will kill bacteria itself.
 
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Revision as of 15:49, 10 October 2014

This experience page is provided so that any user may enter their experience using this part.
Please enter how you used this part and how it worked out.

Applications of BBa_K1412010

chemotaxis towards hyperosmotic pressure, a new killing device.


User Reviews

UNIQ9888cc0158d27cb0-partinfo-00000000-QINU

XMU-China iGEM 2014

BBa K1412010-2.png

The plot of Moving radius versus Sucrose concentration. The four curves were measured after 10h, 11h, 12h and 16.5h respectively.


E.coli make use of the EnvZ/OmpR system to mediate signal transduction in response to environmental osmolarity changes. EnvZ, a histidine kinase, undergoes trans-autophosphorylation, then the high energy phosphoryl group is subsequently transferred to OmpR, a response regulator. In the system, OmpR-controlled promoter (PompC) is involved in. The expression strength of PompC is depending upon the medium osmolarity. When medium osmolarity is increasing, the EnvZ will phosphorylate more OmpR into phosphorylated OmpR (OmpR-P), and more OmpR-P will result in stronger expression strength of PompC. In our circuitry design, CheZ is upstream regulated by PompC. As the osmotic pressure is increasing, the motile ability of the engineered E.coli keeps growing, resulting in it's suicide.

We use semi-solid medium culture with gradient concentration of sucrose to characterize the device (BBa_K1412010). Setting the motile ability is proportional to the moving radius. From the plot, when no sucrose added in, the motile ability is the weakest. The motile ability keeps growing while the concentration of sucrose increased from 0 to 4%. Then the motile ability went down slightly as the sucrose concentration increased from 4% to 10%, but is still stronger than that at concentration 0. We can make the conclusion that our device is working as expectation, the motile ability went down because of the inhibition from hyperosmotic pressure. Besides, for even at the inhibiting osmotic pressure, the motile ability is still stronger than that without any inducer, reprogrammed CL-1 may even swim to killing osmotic pressure which will kill bacteria itself.

UNIQ9888cc0158d27cb0-partinfo-00000001-QINU

References

[1][http://onlinelibrary.wiley.com/doi/10.1111/j.1365-2958.2006.05048.x/abstract;jsessionid=DB389E887A1738CF004BAD1B61A6D336.f01t01 Batchelor, Eric, and Mark Goulian. "Imaging OmpR localization in Escherichia coli." Molecular Microbiology 59.6(2006):1767–1778.]

[2][http://www.ncbi.nlm.nih.gov/pmc/articles/PMC216723/ Kawaji, H., T. Mizuno, and S. Mizushima. "Influence of molecular size and osmolarity of sugars and dextrans on the synthesis of outer membrane proteins O-8 and O-9 of Escherichia coli K-12." Journal of bacteriology 140.3 (1979): 843-847.]