Difference between revisions of "Part:BBa K1632004:Design"

Revision as of 07:36, 17 September 2015

fim switch[default ON](wild-type)

Design Notes

sequence confirmed

Materials and Methods

Invertion assay with FimB

1. Construction

All the samples were DH5α strain with antibiotic resistance to ampicillin and kanamycin.

(1) PBAD/araC_fimB (pSB6A1) + fim switch[default ON](wild-type)_rbs_gfp (pSB3K3)
(2) PBAD/araC_fimB (pSB6A1) + fim switch[default OFF](wild-type)_rbs_gfp (pSB3K3)
(3) pSB6A1 + fim switch[default ON](wild-type)_rbs_gfp (pSB3K3) …positive control 1
(4) pSB6A1 + fim switch[default OFF](wild-type)_rbs_gfp (pSB3K3) …negative control 1
(5) PBAD/araC_fimB (pSB6A1) + J23119_rbs_gfp(pSB3K3) …positive control 2
(6) PBAD/araC_fimB (pSB6A1) + rbs_gfp(pSB3K3) …negative control 2

Fig. 1. Plasmids

2. Assay protocol

1. Prepare overnight cultures for the each sample in 3 mL of LB medium containing ampicillin (50 microg / mL), kanamycin (30 microg / mL)　and glucose (final concentration of mass of glucose is 0.5 %) at 37 ℃ for 12h.
2. Make a 1:100 dilution in 3 mL of fresh LB containing Amp, Kan and glucose (final concentration of mass of glucose is 0.5 %).
3.Grow the cells at 37 ℃, shaking at 180 rpm until the observed OD590 reaches 0.4 (Fresh Culture).
4. After incubation, take 1 mL of the samples, and centrifuge at 5000x g, 1 min, 25 ℃
5. Remove the supernatant.
6. Add 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. Add 1 mL of LB containing Amp and Kan, and suspend.
11. Add 30 microL of suspension in the following medium.
① 3 mL of LB containing Amp, Kan, glucose (final concentration of mass of glucose is 0.5 %) and 30 microL of sterile water
② 3 mL of LB containing Amp, Kan and 30 microL of 2 mM　arabinose (final concentration of arabinose is 20 microM)
③ 3 mL of LB containing Amp, Kan and 30 microL of 20 mM arabinose (final concentration of arabinose is 200 microM)
④ 3 mL of LB containing Amp, Kan and 30 microL of 500 mM arabinose (final concentration of arabinose is 5 mM)
※ As for C and D, the suspension were added only in medium ① and ④.
12. Incubate the samples at 37 ℃, shaking at 180 rpm for 6.5 hours. (Measure 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.)

Source

Gene synthesis by eurofins

References

Ian C. Blomfield et al. (1997) Integration host factor stimulates both FimB- andFimE-mediated site-specific DNA inversion that controlsphase variation of type 1 fimbriae expression in Escherichia coli. Molecular Microbiology 23(4), 705–717

John M. Abraham et al. (1985) An invertible element of DNA controls phase variation of type 1 fimbriae of Escherichia coli. Proc Natl Acad Sci U S A 82(17):5724-7

Matthew P. McCusker et al. (2008) DNA sequence heterogeneity in Fim tyrosine-integrase recombinase-binding elements and functional motif asymmetries determine the directionality of the fim genetic switch in Escherichia coli K-12. Molecular Microbiology 67(1): 171–187