Part:BBa_K346002:Experience

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Applications of BBa_K346002

By annealing PmerT-forward (5’-3’) and PmerT-reverse (5’-3’) primers, PTPCAD carrying a sticky end of EcoRI and SpeI was cloned upstream of BBa_E0840, a GFP generator. With exogenous expression of MerR in bacteria, GFP’s expression could be induced by Hg (II) in a dose response manner. The PTPCAD-E0840 was then cloned into pSB3K3 backbone and the BBa_J23103 (constitutive promoter)-merR into pSB1A3.

Protocols for promoter characterization

1.An overnight culture of bacteria carrying the two plasmids pSB3K3 and pSB1A3 were grown in LB broth with ampicillin and kanamycin at 37°C was reactivated by diluting the culture in a ratio of 1:100 with fresh LB.

2.When OD600 reached 0.4-0.6, the bacteria was disposed to several EP tubes, each owning 500uL, and different dose of Mercuric chloride solution was spplied with 3 duplicates and the final concentration varied from 0 to 1.0E-6 mol/L. 100uL of the 500uL was added to the black-96-well plates for GFP intensity’s measurement and another 100uL was added to the transparent-96-well plates for OD600 measurement.

3.In-plate culture fluorescence and OD600 was recorded at 20min intervals from 0 to 275min and the GFP intensity of 20min before inducement was also measured. Temperature was constant at 37°C.

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