Difference between revisions of "Part:BBa K1949104:Design"

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Ptet-RBS-mazE

Design Notes

sequence confirmed

Materials and Methods

Construction

-Strain

All the plasmids were prepared in XL1-Blue strain.

Ⅰ.Adjustment of MazF Expression

-Plasmids

E. coli A: Pcon - rbs - gfp (pSB6A1), Plac - rbs (pSB3K3)

E. coli B: PBAD - rbs - mazF - tt - Pcon - rbs - gfp (pSB6A1), Plac - rbs (pSB3K3)

Ⅱ.mazEF System Assay ~Stop & GO~

-Plasmids

E. coli C: PBAD - rbs (pSB6A1), Plac - rbs (pSB3K3)

E. coli A: Pcon - rbs - gfp (pSB6A1), Plac - rbs (pSB3K3)

E. coli D: PBAD - rbs - mazF - tt - Pcon - rbs - gfp (pSB6A1), Plac - rbs - mazE (pSB3K3)

E. coli B: PBAD - rbs - mazF - tt - Pcon - rbs - gfp (pSB6A1), Plac - rbs (pSB3K3)

Ⅲ.mazEF System Assay ~Go & Stop~

-Plasmids

E. coli C: PBAD - rbs (pSB6A1), Plac - rbs (pSB3K3)

E. coli A: Pcon - rbs - gfp (pSB6A1), Plac - rbs (pSB3K3)

E. coli G: PBAD - rbs - mazF - tt - Pcon - rbs - gfp (pSB6A1), Pcon - rbs(weak) - mazE (pSB3K3)

E. coli F: PBAD - rbs - mazF - tt - Pcon - rbs - gfp (pSB6A1), Pcon - rbs - mazE (pSB3K3)

E. coli E: PBAD - rbs - mazF - tt - Pcon - rbs - gfp (pSB6A1), vector (pSB3K3)

Ⅳ.Control of Cell Growth

-Plasmid

E. coli I: PBAD - rbs (pSB6A1), Plac - rbs (pSB3K3)

E. coli D: PBAD - rbs - mazF (pSB6A1), Plac - rbs - mazE (pSB3K3)

E. coli H: PBAD - rbs - mazF(pSB6A1), Plac - rbs (pSB3K3)

Assay protocol

Ⅰ.Adjustment of mazF Expression

Pre-culture

1)Suspend colonies on a master plate into LB medium containing ampicillin (50 microg / mL) and kanamycin (50 microg / mL).

2)Incubate with vigorous shaking for 12 h.

Incubation and Assay

1)Measure the turbidity of the pre-cultures.

2)Dilute the pre- cultures to 1 / 30 into LB medium containing 4 mL ampicillin and kanamycin.

3)Incubate with vigorous shaking so that the turbidity becomes 0.03.

4)Add arabinose so that the final concentration becomes 0.2%, 0.02%, 0.002% 0.0002% and 0%.

5)Incubate with vigorous shaking for 24 h, and measure the turbidity and the RFU of GFP.

Ⅱ.mazEF System Assay ~Stop & GO~

Pre-culture

1)Suspend colonies on a master plate into LB medium containing ampicillin (50 microg / mL) and kanamycin (50 microg / mL).

2)Incubate with vigorous shaking for 12 h.

Incubation and Assay

1)Measure the turbidity of the pre-cultures.

2)Dilute the pre-cultures to 1 / 30 into LB medium containing 4 mL ampicillin and kanamycin.

3)Incubate with vigorous shaking so that turbidity becomes 0.03.

4)Add arabinose so that the final concentration becomes 0.02%.

5)Add IPTG until the concentration becomes 2 mM after adding arabinose.

6)Incubate with vigorous shaking for 24 h, and measure turbidity and RFU of GFP at the proper time.

Ⅲ.mazEF System Assay ~Go & Stop~

Pre-culture

1)Suspend colonies on a master plate into LB medium containing ampicillin (50 microg / mL) and kanamycin (50 microg / mL).

2)Incubate with vigorous shaking for 12 h.

Incubation and Assay

1)Measure the turbidity of the pre-cultures.

2)Dilute the pre-cultures to 1 / 30 into LB medium containing 4 mL ampicillin and kanamycin.

3)Incubate with vigorous shaking so that the turbidity becomes 0.03.

4)Add arabinose so that the final concentration becomes 0.02%.

5)Incubate with vigorous shaking for 24 h, and measure the turbidity and the RFU of GFP at proper times.

Ⅳ.mazEF System Assay on the LB Agar Plate(Queen's Caprice)

1)Making LB agar medium(see Table 1.).

Fig. 1. Overview of the experiment

2)E. coli are applied at 3 agar medium (in arabinose, in IPTG, in arabinose and IPTG)(Fig. 1.).

3)Overnight culture at 37°C for 24 h.

4)To confirm TA system, inoculate colonies of E. coli having plasmids at agar medium containing arabinose and IPTG.

5)Overnight culture at 37°C for 24 h.

6)Inoculate colonies of E. coli into agar medium containing arabinose.

7)Overnight culture at 37°C for 24 h.

8)Inoculate colonies of E. coli into agar medium in arabinose and IPTG.

9)Overnight culture at 37°C for 24 h.

References

1)Hazan, R., B. Sat, and H. Engelberg-Kulka. Escherichia coli mazEF mediated cell death is triggered by various stressful conditions. J. Bacteriol.186:3663–3669.