Part:BBa_K863005:Experience

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UNIQ4015819e3793c850-partinfo-00000000-QINU UNIQ4015819e3793c850-partinfo-00000001-QINU

••••• Slovenia_HS

Slovenia HS characterized this part in 2015. Escherichia coli BL21 (DE3) bacteria were transformed with the expression plasmids (BBa_K863005 and BBa_K863010) and grown in 10 ml at 37 °C in LBC medium overnight. To express both recombinant proteins, 10 ml of overnight cultures shaker cultures were grown at 37 °C in LB broth supplemented with 30 µg/ml chloramphenicol and shaking with 225 rpm. Expression of the recombinant protein was induced by addition of IPTG to a final concentration of 1 mM, when the cell density reached an OD600 of 0.8. After induction, cells were grown for 5 h and then collected by centrifugation at 6000g for 10 min. The cell pellet collected from 400 ml of bacterial culture was resuspended in 20 ml of resuspension buffer (50 mM HEPES pH 7.5, 500 mM NaCl, 20 mM imidazole) and sonified 3 × 6 min on ice. Following centrifugation at 30 000 × g for 10 min to remove insoluble debris, the supernatant was applied to a Ni-NTA Superflow Cartridge (Qiagen) connected to ÄKTA FPLC system, washed with the resuspension buffer and eluted in the same buffer, but containing 250 mM imidazole. The peak fractions were collected and 15 µl of each fraction was collected and resolved on 12 % SDS-PAGE. We found that while BBa_K863005 shows excellent activity, BBa_K863010 shows no activity under the same conditions.

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••••• University College London 2012

As part of our collaboration with Bielefeld-Germany, we have characterised their Laccase BioBrick utilising a Syringaldazine assay to determine their Laccase activity. Syringaldazine is oxidised by Laccase, causing a colourmetric change that can be observed by a spectrophotometer at 530nm. As seen in the graph below, the highest rate of Laccase production is in transformed BL21 cells - this is to be expected due to the T7 promoter, which requires the T7 RNA polymerase that BL21 produces. However, expression in transformed W3110, which does not produce T7 RNA polymerase, is still elevated above that of untransformed E. coli, though not at the level of expression of transformed BL21. We hence conclude that Bielefeld-Germany's Laccase BioBrick is working as expected.

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