Part:BBa_K5267049
P_min->IgK->Nluc->bGH_polyA
As a blank control
Sequence and Features
- 10COMPATIBLE WITH RFC[10]
- 12COMPATIBLE WITH RFC[12]
- 21COMPATIBLE WITH RFC[21]
- 23COMPATIBLE WITH RFC[23]
- 25INCOMPATIBLE WITH RFC[25]Illegal NgoMIV site found at 153
- 1000COMPATIBLE WITH RFC[1000]
Usage and Biology
CRE(cAMP response element)play an important role as the binding site of CREB(cAMP response element binding protein) ,which is typically found within 100 nucleotides of the TATA Box. CREB binds to cAMP response elements and recruits transcriptional coactivators (such as CBP/p300) to form transcription complexes that initiate transcription of target genes.[1]
TATA Box is one of the components that constitute the promoter of eukaryotes. The consistent order is TATA(A/T)A(A/T) (non-template chain sequence). It is about -30bp (-25~-32bp) upstream of the transcription starting point of most eukaryotic genes, and is basically composed of A-T base pairs, which determines the selection of gene transcription and is one of the binding sites of RNA polymerase. RNA polymerase can only start transcription after firmly binding to the TATA Box. The ability of CRE sequences to mediate transcriptional activation in response to cAMP appears to be somewhat promoter dependent[1],in this experiment, TATA box of the commonly used CMV promoter was selected to minimize to the minimum amount of nucleotides for transcription and named Pmin.
The activity of CREB is modulated by a plethora of signaling cascades, including three downstream pathways that are activated by the melatonin receptor MT1/2 in response to melatonin stimulation: the cAMP/PKA pathway, the calcium (Ca2+) signaling pathway, and MAPK/ERK pathway.[2] Consequently, CRE can be employed as a diagnostic element to assess the successful activation of the melatonin receptor's downstream signaling pathways.
In part 4xCRE- >IgK->Nluc->bGH_polyA(BBa_K5267040) We design a reporter plasmid vector for the melatonin receptor pathway .This part is designed to function as a control group. Pmin (Bba_K3064030) is loaded into the vector as a diagnostic element to assess the successful activation of the receptor's downstream signaling pathways., IgK (BBa_K3117006)is a signaling sequence, directing the protein into the secretory pathway , Nluc(BBa_K2728003) is engineered for optimal performance as a luminescent reporter to detect cAMP concentration [3]. If it is successfully expressed, the cell will glow blue fluorescence. bGH_polyA (BBa_K1313006)is a terminator, controlling the cessation of gene expression .
Based on the composition of this part, it functions as a cAMP concentration detection platform. Howerer，since there is no response element upstream, the Gene expression should be low.
Special design
In order to verify the influence of CRE（cAMP response element） sequence on downstream pathway, we constructed Pmin using TATA box and GC box of CMW promoter. The Pmin is a low expression synthetic promoter in mammalian cells. CRE sequences can be placed upstream of this promoter to produce high expression of downstream genes
Function test
Method
Forskolin (Coleonol) is a potent adenylate cyclase activator with an IC50 of 41nM and an EC50 of 0.5μM for type I adenylyl cyclase[4], which can stimulate cAMP concentration to increase.</p>
To validate this part, initiating transcriptional activation, Weconstructed pNC005 pLM010, a plasmid carrying 4xCRE_Pmin- IgK->Nluc->bGH_polyA (BBa_K5267040) and Pmin _IgK->Nluc->bGH_polyA (BBa_K5267049). When When transfected cells were stimulated by Forskolin causing intracellular cAMP concentration increased, the two groups are reciprocally used as control groups.
result
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