Part:BBa_K1616023:Experience

Applications of BBa_K1616023

Liquid culture of bacteria transformed with BBa_K325909, BBa_K115900 and BBa_K1616023

Light intensity has been measured 5 hours after induction with arabinose or IPTG depending on the Biobrick, when DO 600 was between 0,6 and 0,8. BBa_K325909 already has the substrate synthesis within its sequence, therefore we only had to measure the kinetic during 5h of induction and took the maximum value. For the others, we added NanoGlow substrate from Promega (ratio 1:1), measured kinetics over 120 min and took the maximum value.

Fig. 1: Relative light unit depending on the concentration of IPTG

We worked in BL21(DE3) bacteria for our plasmid “T7 Nanoluc”. Thus, addition of IPTG activates the induction of the Plac promoter and then expression of T7 RNA polymerase is possible. It results in different light intensities proportional to the concentration of IPTG: the more IPTG you have, the brighter!

Fig. 2: Comparison of the relative light unit using 3 differents Biobricks:Induction of BBa_K325909 and BBa_K1159001 with a solution of arabinose 1%, and a solution of IPTG 1 mM for T7-Nanoluc.

We compared our new T7 Nanoluc to the first Luxbrick created by Cambridge in 2010 (BBa_K325909), and to BBa_K1159001. T7 NanoLuc showed a 1,2 times brighter light intensity (RLU) than BBa_K1159001 and a light intensity approximately 140 times brighter than BBa_K325909.

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