Protein_Domain

Part:BBa_K909007

Designed by: Gintautas Vainorius   Group: iGEM12_ETH_Zurich   (2012-09-23)

TetR DNA binding domain containing BamHI site for protein fusions


Truncated version of tetracycline repressor TetR, consisting of 1 – 127 amino acids, containing DNA binding domain. The rest of the protein, responsible for tetR dimerization, were removed. Without dimerization domain, tetR-DBD fails to bind TetR responsive promoter efficiently and unable to repress transcription of reporter protein (see figure). However, TetR-DBD fusion with dimerazing proteins, e.g. UVR8 protein (BBa_K909008), restores TetR-DBD promoter binding.

GFP repression (reporter) by full length TetR, TetR-DBD and dimerizing TetR-DBD-UVR8 fusion

Usage and Biology

We introduced BamHI site at C terminus of tetR-DBD for an easy in frame fusions with other proteins. This can easily be used as a two hybrid system to detect homo/heterodimers in E. coli, and, in principle, one can use these fusions to turn protein-protein interaction into the repression of transcription. Furthermore, inducible dimerization can lead to a novel switch like behaviors of the system (e.g. ETH Zurich 2012 team created a novel UV-B inducible-ON switch).


Sequence and Features


Assembly Compatibility:
  • 10
    COMPATIBLE WITH RFC[10]
  • 12
    COMPATIBLE WITH RFC[12]
  • 21
    INCOMPATIBLE WITH RFC[21]
    Illegal BamHI site found at 382
  • 23
    COMPATIBLE WITH RFC[23]
  • 25
    COMPATIBLE WITH RFC[25]
  • 1000
    COMPATIBLE WITH RFC[1000]



Functional Parameters: Austin_UTexas

BBa_K909007 parameters

Burden Imposed by this Part:

Burden Value: -2.9 ± 1.8%

Burden is the percent reduction in the growth rate of E. coli cells transformed with a plasmid containing this BioBrick (± values are 95% confidence limits). This BioBrick did not exhibit a burden that was significantly greater than zero (i.e., it appears to have little to no impact on growth). Therefore, users can depend on this part to remain stable for many bacterial cell divisions and in large culture volumes. Refer to any one of the BBa_K3174002 - BBa_K3174007 pages for more information on the methods, an explanation of the sources of burden, and other conclusions from a large-scale measurement project conducted by the 2019 Austin_UTexas team.

This functional parameter was added by the 2020 Austin_UTexas team.

[edit]
Categories
//proteindomain/dnabinding
Parameters
None