Difference between revisions of "Part:BBa K1632011:Design"

Revision as of 23:57, 18 September 2015

fimE (wild-type)

2008_Caltech FimE(BBa_K137007) didn’t match the nucleotide sequence of fimE of wild type. So, we designed fimE(wild-type) (BBa_K1632011) which completely match the nucleotide sequence of fimE of wild type. Compared with these two parts, two differences were confirmed. First, fimE of 2008_Caltech lacks the nucleotide sequence of N-terminal 15 residues. Second, fimE of 2008_Caltech is different from the nucleotide sequence of C-terminal 2 residues as shown as below.
2008_Caltech : 5’-...-TAA-TAA-Suffix-3’
2015_TokyoTech : 5’-...-GTT-TGA-Suffix-3’

Design Notes

sequence confirmed

Materials and Methods

Construction

All the samples were DH5alpha strain with antibiotic resistance to ampicillin and kanamycin.

A. PBAD/araC_fimE(wild-type) (pSB6A1) + fim switch[default ON](wild-type)_rbs_gfp (pSB3K3)
B. PBAD/araC_fimE(wild-type) (pSB6A1) + fim switch[default OFF](wild-type)_rbs_gfp (pSB3K3)
C. pSB6A1 + fim switch[default ON](wild-type)_rbs_gfp (pSB3K3) …positive control 1
D. pSB6A1 + fim switch[default OFF](wild-type)_rbs_gfp (pSB3K3) …negative control 1
E. PBAD/araC_fimE(wild-type) (pSB6A1) + J23119_rbs_gfp (pSB3K3) …positive control 2
F. PBAD/araC_fimE(wild-type) (pSB6A1) + rbs_gfp (pSB3K3) …negative control 2

Fig. 1. Plasmids

Flow cytometer

Assay protocol

1. Prepare overnight cultures for each sample in 3 mL of LB medium containing ampicillin (50 microg / mL), kanamycin (30 microg / mL)　and glucose (final concentration is 1.0 %) at 37 ℃ for 12h.
2. Make a 1:100 dilution in 3 mL of fresh LB containing Amp, Kan and glucose (final concentration is 1.0 %).
3. Incubate the cells at 37 ℃, shaking at 180 rpm until the observed OD590 reaches 0.4 (Fresh Culture).
4. After the incubation, take 1 mL of the samples, and centrifuge at 5000x g, 1 min, 25 ℃
5. Remove the supernatant.
6. Suspend the pellet in 1 mL of LB containing Amp and Kan, and centrifuge at 5000x g, 1 min, 25 ℃
7. Remove the supernatant.
8. Suspend the pellet in 1 mL of LB containing Amp and Kan, and centrifuge at 5000x g, 1 min, 25 ℃
9. Remove the supernatant.
10. Suspend the pellet in 1mL of LB containing Amp and Kan.
11. Add 30 microL of suspension in the following medium.
① 3 mL of LB containing Amp, Kan, glucose (final concentration of glucose is 1.0 %) and 30 microL sterile water
② 3 mL of LB containing Amp, Kan and 30 microL of 500 microM　arabinose (final concentration of arabinose is 5 microM)
③ 3 mL of LB containing Amp, Kan and 30 microL of 1 mM arabinose (final concentration of arabinose is 10 microM)
④ 3 mL of LB containing Amp, Kan and 30 microL of 2 mM arabinose (final concentration of arabinose is 20 microM)
※ As for C and D, the suspension were added only in medium ① and ④.
12. Incubate the samples at 37 ℃ for 6 hours, shaking at 180 rpm. (Measure the OD590 of all the samples every hour.)
13. After the incubation, take the samples, and centrifuge at 9000x g, 1min, 4℃.
14. Remove the supernatant.
15. Add 1 mL of filtered PBS (phosphate-buffered saline) and suspend. (The ideal of OD is 0.3)
16. Dispense all of each suspension into a disposable tube through a cell strainer.
17. Use flow cytometer to measure the fluorescence of GFP. (We used BD FACSCaliburTM Flow Cytometer of Becton, Dickenson and Company.)

Results

Fig. 2. The histograms of the samples measured by flow cytometer

Supplemental experiments

Assay protocol

1. After the assay of “Arabinose dependent FimE expression”, miniprep cell culture ((1)-①, (1)-③, (2)-①　and　(2)-③) of leftover as here.
(https://parts.igem.org/Help:Protocols/Miniprep) 2. Turn on water bath to 42℃.
3. Take competent DH5alpha strain from -80℃ freezer and leave at rest on ice.
4. Add 3 µl of each plasmids in a 1.5 ml tube.
5. Put 25 µl competent cell into each 1.5 ml tubes with plasmid.
6. Incubate on ice for 15 min.
7. Put tubes with DNA and competent cells into water bath at 42℃ for 30 seconds.
8. Put tubes back on ice for 2 minutes.
9. Add 125 µl of SOC medium. Incubate tubes for 30 minutes at 37℃.
10. Make a 1:5 dilution in 150 µl of fresh SOC medium.
11. Spread about 100 µl of the resulting culture of LB plate containing kanamycin.
12. Incubate LB plate for 14-15 hours at 37℃.
13. Set the plate reader to measure GFP.
14. Scan the each plates with the plate reader. (We used FujiFilm FLA-5100 Fluorescent Image Analyzer from FUJIFilm Life Science.)
15. Analyze the scanning data by changing the scale type (Bezier) and adjusting the range. (We analyzed by using the software, Multi Gauge ver. 2.0 from FUJIFilm Life Science.)
16. Counted out the all colonies and those with fluorescence.
17. Prepare three overnight cultures for each sample in 3 mL of LB medium containing kanamycin (30 microg / mL) shaking at 180 rpm for 12h.
18. Miniprep each samples and ask DNA sequencing of each samples for Biomaterial Analysis Center, Technical Department.

Results

Fig. 3. The histograms of the samples measured by flow cytometer

Fig. 4. The histograms of the samples measured by flow cytometer

Source

PCR from MG1655

===References===