Part:BBa_K2915275:Experience

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Applications of BBa_K2915275: TAL2

IPTG inducible promoter (T7) with RBS – TAL2-HisTag- TEV site

The promoter T7 and RBS (Bba_K525998) are regulator that are assembled with TAL2, which allows the production TAL2 with its HisTag using E.coli DH5-alpha bacteria. This part can bind itself with a DNA sequence of 5’ CCGCTG 3’ (BM2). This engineered TAL consist of repeat domain has a primary structure with two amino acids that differs in each domain, those two amino acids are a code for one nucleotide of the binding sequence selected. HD, HD, NN, HD, NG and NN are the two amino that are changed in the CCGCTG sequence, respectfully.

Usage and Biology

This Transcription Activator-Like (TAL) is a specific DNA binding protein, that is designed to recognize a specific DNA binding motif (BM1). This BM1 are present on the DNA that are amplify by PSR.

Production

To verify the production of TAL2, an SDS PAGE was performed and stained with Coomassie blue. Different growing conditions were tested to determine the best growing conditions. The production was also tested two types E.coli bacteria : -DH5a -BL21 DE3

Figure 1. SDS-PAGE of the production in DH5a of TAL, well 1, 2 and 3 are not induced of TAL1, TAL2 clone1 and TAL2 clone2, respectively. Well 4, 5 and 6 are induced at 30°C with 0.1M IPTG for 3 hours of TAL1, TAL2 clone1 and TAL2 clone2, respectively.

T--Aix-Marseille--TAL2 production 1 picture.png

Fig 2. SDS-PAGE of the production in BL21 DE3 of TAL. Well 1, 3 and 5 are induced at 30°C with 0.1M IPTG for 3 hours of TAL1, TAL2 clone1 and TAL2 clone2, respectively. Well 2,4 and 6 are induced at 16°C with 0.1M IPTG overnight.

Purification

We were able to purify our protein using the HisTag on the C-terminal of our protein. We used a histidine tagged protein purification columns. To verify our purification, we performed a Western Blot analysis with a Red Ponceau staining.

T--Aix-Marseille--TAL2 WB purif picture.png

Fig 3. Western Blot analysis of TAL1 after purification with HisTag column. LD= loading sample, NR= non-restraint, E1 to E5 correspond to the eluted fractions.

Activity test

To verify the functionality of this part we did an electrophoretic mobility shift assay (EMSA) also none as a gel shift assay, which is a method that’s able to analyze the potential interaction protein-DNA. We used the gel shift assay in order to study our proteins for the respectively targeted DNA amplicons.

Fig 4. Activity test of TAL2 in the presence/absence of the DNA amplify. Description of the test activity for TAL2, see experiments page.

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