Part:BBa_K782020
10x[TALA] operator_CMV promoter_fLuciferase
- TALA label represents TAL effector 1257 from zebrafish experiments (Sander et al., 2011).
- DNA binding sites for individual TAL effectors are indicated with square brackets [ ].
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, upstream of a CMV promoter (constitutive promoter for expression in mammalian cells). Downstream of the promoter we cloned fLuciferase (firefly luciferase) to function as a reporter.
Figure 1:Schematic representation of our construct.
Characterisation
HEK293T cells were transfected with the 10x[TALA] operator_CMV promoter_fLuciferase reporter and TALA:NLS:KRAB (Figure 2). Tests showed, successful repression of fLuciferase with TAL repressor. Tests showed that tested construct exhibited over 90% repression of the reporter plasmid (Figure 3).
Figure 2:Schematic representation of repression experiments. A: in the absence of a TALA:NLS:KRAB, fLuciferase is constituitively expressed. B: when a TALA:NLS:KRAB is present, it binds to its binding site upstream of the CMV promoter and represses transcription of fLuciferase with the KRAB domain.
Figure 3:Testing repression of reporter luciferase gene. White column is showing constantly expressed reporter (fLuc), blue column is showing repression with TALA:KRAB.
- fLuciferase was contributed by host lab.
- Binding sites for TAL effectors were ordered from IDT.
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
- 10COMPATIBLE WITH RFC[10]
- 12COMPATIBLE WITH RFC[12]
- 21INCOMPATIBLE WITH RFC[21]Illegal BamHI site found at 914
- 23COMPATIBLE WITH RFC[23]
- 25INCOMPATIBLE WITH RFC[25]Illegal NgoMIV site found at 341
Illegal NgoMIV site found at 701
Illegal NgoMIV site found at 1626
Illegal NgoMIV site found at 2970
Illegal NgoMIV site found at 2991
Illegal NgoMIV site found at 3306
Illegal AgeI site found at 206
Illegal AgeI site found at 541
Illegal AgeI site found at 566
Illegal AgeI site found at 901
Illegal AgeI site found at 2694 - 1000INCOMPATIBLE WITH RFC[1000]Illegal SapI.rc site found at 2876
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