Difference between revisions of "Part:BBa K4414037"

 
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<partinfo>K4414037 short</partinfo>
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This composite part consists of a C-terminal tetR(BBa_K4414009) domain and an NR3C1 LBD(BBa_K4414000) domain fused with NES(BBa_K4414003). It is designed to sense glucocorticoids and activates the transcription of the reporter gene.
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==Usage and Biology==
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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. This part consists of a tetR DNA binding domain, which binds to the TCE promoter (BBa_K4016011) consisting of seven direct 19-bp tet operator sequence (tetO) repeats. The NR3C1 LBD domain on the N terminal 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.[1] NES is a nuclear export signal which can translocate protein from the nucleus into the cytosol .
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<figure class="figure">
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<img src="https://static.igem.org/mediawiki/parts/1/17/T--NUDT_CHINA--Part_PixD-PixE_Schematic.png" class="figure-img img-fluid rounded"  height="250px">
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Figure1. Schematic figure of PixE-PixD interaction under blue light stimulation
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Respond to stimuli.
 
  
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===Usage and Biology===
 
  
 
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<partinfo>BBa_K4414037 parameters</partinfo>
 
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===Method===
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<figure class="figure">
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<img src="https://static.igem.org/mediawiki/parts/6/65/T--NUDT_CHINA--Part_Validation_SEAP_PixE-PixD.png
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" class="figure-img img-fluid rounded"  height="350px">
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HEK-293T cells were co-transfected with plasmids encoding both BBa_K4414044 and TCE-SEAP. Cells were treated with 100 nM Glucocorticoids 6 h post-transfection. Cells without glucocorticoid treatment were used as control. Culture medium was collected at 24 h or 48 h post glucocorticoids treatment. SEAP activity was measured according to a published protocol. [2]
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===Result===
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<figure class="figure">
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<img src="https://2021.igem.org/wiki/images/d/d6/T--NUDT_CHINA--Part_Result_00-01_.png
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Figure 2 Result of SEAP test. The SEAP activity was calculated at 24h and 48h after transfection.
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Results showed significantly increased SEAP expression in glucocorticoid-treated cells compared to the non-treated control. A dose dependence was observed within 0-100 nM of glucocorticoid (Figure 1).
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===Reference===
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[1]Weikum ER, Knuesel MT, Ortlund EA, Yamamoto KR. Glucocorticoid receptor control of transcription: precision and plasticity via allostery. Nat Rev Mol Cell Biol. 2017 Mar;18(3):159-174. doi: 10.1038/nrm.2016.152. Epub 2017 Jan 5. PMID: 28053348; PMCID: PMC6257982.
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[2]Shao J, Qiu X, Xie M. Engineering Mammalian Cells to Control Glucose Homeostasis. Methods Mol Biol. 2021;2312:35-57. doi: 10.1007/978-1-0716-1441-9_3. PMID: 34228283.

Revision as of 16:30, 8 October 2022


TetR-GSG-NES-GSG-LBD

This composite part consists of a C-terminal tetR(BBa_K4414009) domain and an NR3C1 LBD(BBa_K4414000) domain fused with NES(BBa_K4414003). It is designed to sense glucocorticoids 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. This part consists of a tetR DNA binding domain, which binds to the TCE promoter (BBa_K4016011) consisting of seven direct 19-bp tet operator sequence (tetO) repeats. The NR3C1 LBD domain on the N terminal 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.[1] NES is a nuclear export signal which can translocate protein from the nucleus into the cytosol .

Figure1. Schematic figure of PixE-PixD interaction under blue light stimulation



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]




Method

HEK-293T cells were co-transfected with plasmids encoding both BBa_K4414044 and TCE-SEAP. Cells were treated with 100 nM Glucocorticoids 6 h post-transfection. Cells without glucocorticoid treatment were used as control. Culture medium was collected at 24 h or 48 h post glucocorticoids treatment. SEAP activity was measured according to a published protocol. [2]

Result

Figure 2 Result of SEAP test. The SEAP activity was calculated at 24h and 48h after transfection.

Results showed significantly increased SEAP expression in glucocorticoid-treated cells compared to the non-treated control. A dose dependence was observed within 0-100 nM of glucocorticoid (Figure 1).


Reference

[1]Weikum ER, Knuesel MT, Ortlund EA, Yamamoto KR. Glucocorticoid receptor control of transcription: precision and plasticity via allostery. Nat Rev Mol Cell Biol. 2017 Mar;18(3):159-174. doi: 10.1038/nrm.2016.152. Epub 2017 Jan 5. PMID: 28053348; PMCID: PMC6257982. [2]Shao J, Qiu X, Xie M. Engineering Mammalian Cells to Control Glucose Homeostasis. Methods Mol Biol. 2021;2312:35-57. doi: 10.1007/978-1-0716-1441-9_3. PMID: 34228283.