Part:BBa_K2447500:Experience

BBA_K2447500 is characterised using BBa_K2447501. In construct BBa_K2447501, the photosensitive bacterial protein is constitutively produced. In the presence of blue light, EL222 is activated via dimerisation and is able to bind upstream of the pLuxI promoter, thereby allowing the recruitment of RNA polymerase to activate expression of RFP. In the absence of blue light, EL222 does not dimerise and is unable to bind DNA; hence showing minimal RFP expression.

Usage and Characterisation

BBa_K2447501 is inserted into pBbE8k backbone and subsequently characterized in E. coli 10Beta and MG 1655. These cells are grown in LB medium (with kanamycin) at 37 degrees to reach OD600 of 0.1 before blue light is administered for 7 hours. For every hour, RFP readings were obtained and cross-compared with the control (no blue light).

Figure 2: Incubator-shaker used in the blue light experiment.

Figure 3: Blue light being shone on one plate while no light condition was ensured with the covering of a black cloth.

Strong RFP expression was shown from both cell types (under blue-light condition) as compared to the control condition where no light was administered. By the 6th hour onwards, RFP productions had tripled for both cell types when compared to the control condition.

In short, this construct could prove useful for any group seeking to elucidate gene expression based on blue light as a physical stimulus.

Figure 4: MG 1655 under blue light and no light conditions.

Figure 5: 10Beta under blue light and no light conditions.

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