Part:BBa_K1949050:Experience

Materials and Methods

Construction

-strain

All the sample were XL1-Blue strain.

-Plasmids

A. PBAD - rbs - amiE (pSB6A1)

B. Ptet - rbs - luxR - tt - Plux - rbs - gfp (pSB6A1)

C. Ptet - rbs - rhlR - tt - Prhl - rbs - gfp (pSB6A1)

Assay Protocol

1. Inoculate A in 3 mL LB medium ampicillin (50 microg / mL), and add glucose so that the final concentration becomes 0.2%.Inoculate B and C in LB medium containing ampicillin (50 microg / mL).

2. Incubate all samples at 37°C, 180rpm for 12 h.

3. Dilute the overnight culture of A so that the turbidity becomes about 0.05.

4. Incubate at 37°C, 180rpm so that turbidity becomes about 0.05.

5. Add arabinose into test tube (ⅰ) and (ⅱ) so that the final concentration becomes 0.2%.

6. 2 h after adding arabinose, add 60 microL of 3OC12HSL (500 microM) into test tube (ⅰ) and (ⅲ), and add 200 microL of 3OC12HSL (500 microM) into test tube (ⅱ) and (ⅳ).

7. 5 h after adding AHLs, dispense the fresh cultures into 1.5 mL tubes, and centrifuge in duplicate for 2 min at 18000G.

8. Transfer supernatant to another 1.5 mL tube.

9. Add each 10 microL overnight culture for B and C into 800 microL LB medium containing ampicillin (50 microg / mL). Also, add each 10 microL overnight culture for B and C into 1 mL LB medium containing ampicillin (50 microg / mL) for controls. (B: a, c, e, g),(C: b, d, f, h)

10. After 1.5 h, add 200 microL supernatants of A into (ⅰ), (ⅱ), (ⅲ), and (ⅳ), and add 4 microL 3OC12HSL into tube (e), 13.3 microL C4HSL into tube (f), 4 microL DMSO into tube (g), 13.3 microL DMSO into tube (h) for controls.

11. incubate at 37°C, 180 rpm for 4 h.

12. Measure RFU of GFP and the terbidity.

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