Part:BBa_K2915225:Experience

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Applications of BBa_K2915225 : TAL1

IPTG inducible promoter (T7) with RBS – TAL1-HisTag- TEV site

The promoter T7 and RBS (Bba_K525998) are regulator that are assembled with TAL1, which allows the production TAL1 with its HisTag using E.coli DH5-alpha bacteria. This part can bind itself with a DNA sequence of 5’ CTGATC 3’ (BM1). 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, NG, NN, NI, NG and HD are the two amino that are changed in the CTGATC 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 TAL1, 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 TAL1, 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 TAL1. 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.

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