Difference between revisions of "Part:BBa K1632023:Experience"
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====Results==== | ====Results==== | ||
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| + | [[Image:Tokyo_Tech Pcon_rbs_rhlR_TT_Plux_rbs_cmRssrA.png|thumb|center|550px|<b>Fig. 2.</b> The cells growth with Cm]]<br> | ||
====Discussion==== | ====Discussion==== | ||
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| + | <span style="margin-left: 10px;">The cells which have ''rbs-cmR'' without an ssrA degradation tag showed active growth. It showed leaky expression of CmR. Because of them, cells grew actively even in the absence of AHL. But compared with circuits without an ssrA tag, our improved BBa_K1632022 indeed showed much slower growth.<br> | ||
| + | <span style="margin-left: 10px;">From the results above, we can say that the leaked CmR protein was degraded immediately because of the ssrA tag added right after the CmR protein. These results show the improved function of AHL-dependent CmR expression. | ||
===More information=== | ===More information=== | ||
Revision as of 12:34, 18 September 2015
J23100_rbs_rhlR_TT_Plux_rbs_CmRssrA
Contents
Materials and Methods
Construction
All the samples were JM2.300 strain with antibiotic resistance to ampicillin and kanamycin.
(1) J23100_rhlR_TT_Plux_CmR (pSB6A1) + Plac_lasI (pSB3K3)
(2) J23100_rhlR_TT_Plux_CmR (pSB6A1) +promotor_lasI (pSB3K3)
(3) J23100_rhlR_TT_promotor_CmR (pSB6A1) + Plac_lasI (pSB3K3)…Negative control #1
(4) J23100_rhlR_TT_promotor_CmR (pSB6A1) +promotor_lasI (pSB3K3)…Negative control #2
(5) J23100_rhlR_TT_Plux_CmRssrA (pSB6A1) + Plac_lasI (pSB3K3)
(6) J23100_rhlR_TT_Plux_CmRssrA (pSB6A1) +promotor_lasI (pSB3K3)
Assay protocol
1.Prepare overnight cultures for the samples in 3 mL LB medium, containing ampicillin (50 microg/mL) and kanamycin (30 microg/mL) at 37°C for 12 hours.
2.Make a 1:100 dilution in 3 mL of fresh LB containing antibiotic and grow the cells at 37°C until the observed OD590 reaches 0.5.
3.Centrifuge 1 mL of the sample at 5000g, RT for 1 minute.
4.Suspend the pellet in 1mL of LB containing Amp and Kan.
5.Add 30 microL of suspension in the following medium.
a)LB (3 mL) + antibiotics (Amp 50 microg/mL + Kan 30 microg/mL) + 500 microL C4HSL (3 microL) + 99.5% ethanol (3 microL)
b)LB (3 mL) + antibiotics (Amp 50 microg/mL + Kan 30 microg/mL) + DMSO (3 microL) + 99.5% ethanol (3 microL)
c)LB (3 mL) + antibiotics (Amp 50 microg/mL + Kan 30 microg/mL) + 500 microL C4HSL (3 microL) + 100 mg/mL Chloramphenicol (3 microL)
d)LB (3 mL) + antibiotics (Amp 50 microg/mL + Kan 30 microg/mL) + DMSO (3 microL) + 100 mg/mL Chloramphenicol (3 microL)
6.Grow the samples of cells at 37°C for more than 8 hours.
7.Measure optical density every hour. (If the optical density is over 0.9, dilute the cell medium to 1/5.)
Results
Discussion
The cells which have rbs-cmR without an ssrA degradation tag showed active growth. It showed leaky expression of CmR. Because of them, cells grew actively even in the absence of AHL. But compared with circuits without an ssrA tag, our improved BBa_K1632022 indeed showed much slower growth.
From the results above, we can say that the leaked CmR protein was degraded immediately because of the ssrA tag added right after the CmR protein. These results show the improved function of AHL-dependent CmR expression.
More information
For more information, see [http://2015.igem.org/Team:Tokyo_Tech/Project our work in Tokyo_Tech 2015 wiki].
More information
For more information, see [http://2015.igem.org/Team:Tokyo_Tech/Project our work in Tokyo_Tech 2015 wiki].
Applications of BBa_K1632023
User Reviews
UNIQ2fb4872c812a70fe-partinfo-00000001-QINU UNIQ2fb4872c812a70fe-partinfo-00000002-QINU