Difference between revisions of "Part:BBa K4414025"
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Figure 1. Schematic figure of BBa_K4414025) and ([[Part:BBa_K4414041]]).
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Figure 1. Schematic figure of BBa_K4414025 and ([[Part:BBa_K4414041]]).
  
  

Revision as of 09:13, 11 October 2022


LBD-GGGGGSG-tetR-GGGSG--NLS-vp64

This part is an integrated tool for the perception of cortisol stimulation and activates the transcription of the reporter gene.


Usage and Biology

As a glucocorticoid sensor, this part is designed to enter the nucleus upon glucocorticoid stimulation and bind to the TCE promoter to activate downstream transcription. The NR3C1 LBD domain on the N terminus is the ligand binding domain of the glucocorticoid receptor (GR). This LBD domain can translocate the fusion protein into the nucleus upon glucocorticoid stimulation. It also has a transactivating domain 2 (τ2) and an activation function domain 2 (AF2) which activates downstream gene expression.(Weikum et al., 2017). GGGSG linker, owning some flexibility and allowing the proteins on both sides to complete their own independent functions. Tet R in our design provides DNA binding domain tightly binding to the downstream gene, which binds to the TCE promoter (Part:BBa_K4016011) consisting of seven direct 19-bp Tet operator sequence (Teto) repeats. NLS (nuclear localization signal) helps the nucleophilic proteins better move into the nucleus. VP64 is a transcriptional activator composed of four tandem copies of VP16 connected with glycine-serine (GS) linkers. 



Figure 1. Schematic figure of BBa_K4414025 and (Part:BBa_K4414041).


Sequecing

The plasmid was sequenced correct.

Sequence and Features


Assembly Compatibility:
  • 10
    COMPATIBLE WITH RFC[10]
  • 12
    COMPATIBLE WITH RFC[12]
  • 21
    COMPATIBLE WITH RFC[21]
  • 23
    COMPATIBLE WITH RFC[23]
  • 25
    COMPATIBLE WITH RFC[25]
  • 1000
    COMPATIBLE WITH RFC[1000]



Functional test

To test the ability of this part to respond to glucocorticoids, HEK-293T cells were co-transfected with plasmids encoding both LBD-GGGGGSG-Tet R-GGGSG-NLS-VP64 BBa_K4414025 and TCE-SEAP(Part:BBa_K4414041).

Method

Cells were treated with 0 or 100 nm Glucocorticoids 6h post-transfection. Cells without glucocorticoid treatment were used as control. Culture medium was collected at 24 h post glucocorticoids treatment. SEAP activity was measured according to a published protocol.(Shao et al., 2021)

Figure2.Schematic representation of the experimental process of validation for BBa_K4414025 and (Part:BBa_K4414041).


Result

Results showed similar SEAP expression in glucocorticoid-treated cells compared to the non-treated control (1.49 folds).

Figure3.Glucocorticoid-stimulated transcriptional activation of SEAP mediated by BBa_K4414025.


Reference

1. Weikum, E. R., Knuesel, M. T., Ortlund, E. A., & Yamamoto, K. R. (2017). Glucocorticoid receptor control of transcription: precision and plasticity via allostery. Nature reviews. Molecular cell biology, 18(3), 159–174. https://doi.org/10.1038/nrm.2016.152

2.Shao, J., Qiu, X., & Xie, M. (2021). Engineering Mammalian Cells to Control Glucose Homeostasis. Methods in molecular biology, 2312, 35-57 .