Difference between revisions of "Part:BBa K782028"

Revision as of 15:23, 26 September 2012

10x[TALA+TALB] operator_minimal promoter_mCitrine

TALA and TALB labels represents TAL effectors 1257 and 1297 from zebrafish experiments (Sander et al., 2011)

Introduction

Transcription activation like (TAL) effectors are DNA binding proteins with a high specifity, built from tandem repeats, with near identical seqences, differing only in two amino acids in each repeat called “repeat variable diresidue” (RVD), which determine the specifity for a single nucleotide.(Scholze and Boch, 2011)

We designed our construct with 10 binding sites for TALA and TALB, upstream of a minimal promoter (like here). Downstream of the promoter we cloned the yellow fluorescent protein mCitrine an easy detectable monomer with excitation maximum at 516 nm and emission maximum at 529 nm.

Figure1:Schematic representation of our construct

Characterisation

HEK293T cells were cotransfected with 10x[TALA+TALB] operator_minimal promoter_mCitrine and either TALA:VP16 or TALB:VP16(Figure 2). All experiments were executed in 3 biological replicates and repeated over 3 times with similar results.

Figure 2:Schematic representation of activation experiments. A: in the absence of a TAL activator, the expression of the reporter gene is repressed. B: when TAL activator is present, it binds to its binding site upstream of the minimal promoter and activates transcription of the reporter gene with the VP16 domain.

Figure 3:Testing activation of reporter gene transcription by addition of TAL activator.

References

Sander, J. D., Cade, L., Khayter, C., Reyon, D., Peterson, R. T., Joung, J. K., and Yeh, J.-R. J. (2011) Targeted gene disruption in somatic zebrafish cells using engineered TALENs. Nature Biotechnology 29, 697–698

Scholze, H., and Boch, J. (2011) TAL effectors are remote controls for gene activation. Curr. Opin. Microbiol. 14, 47-53

Sequence and Features