Difference between revisions of "Part:BBa K1722007"

Revision as of 05:43, 3 September 2015

hUPll+AckRS Composite

hUPll is a bladder tissue-specific promoter being found in human urothelium. Uroplakin II (UPII) has been characterized as a bladder tissue-specific protein^[1] and the expression of uroplakin II was found to be limited to bladder-derived cells.^[2-3] Other members of uroplakins, including uroplakinla(UPla), uroplakinlb(UPlb), and uroplakinlll(UPlll), have also been characterized. Therefore, the promoters that direct the expression of the uroplakins may be useful in constructing tissue-specific vectors for bladder cancer gene therapy. Research shows that most of thecis elements that confer the bladder-specificity and differentiation-dependent expression of the human UPll gene reside in the 2542-bp sequence, and TNF driven by the human UPll(hUPll) promoter is effective in the specific inhibition of bladder cancer growth both in vivo and in vitro. Zhu et al transtected the plasmid phUPll-EGFP containing DNA fragment(hUPll) into bladder cancer(BIU-87), renal carcinoma(GRC-1) and endothelial(EC) cell lines.^[4](Fig. 1)

[[File:HUPll_GFP.png]]

Figure 1. The plasmid phUPII-EGFP containing DNA fragment (hUPII) 2542 bp upstream of the UPII gene was transfected into bladder cancer (BIU-87), renal carcinoma (GRC-1), and endothelial (EC) cell lines. Transient transfection was determined either by confocal microscopy or flow cytometric analysis of GFP expression. (a)The activity of human UPII promoter in BIU-87, GRC-1, and EC cell lines. Positive green signals from UPII were more and stronger in BIU-87 than in EC and GRC-1 cell lines.(b) The GFP activity in BIU-87, GRC-1, and EC was tested by flow cytometry. A positive rate from UPII was higher in BIU-87 than in EC and GRC-1 cell lines. The percentage of GFP-positive cells in BIU-87 cell line, EC cell line, and GRC-1 cell line was 10.1, 1.8, and 0% respectively.^[4]

Ack is a kind of unnatural amino acid(UAA) that is close structural analog of Lysine, a canonocal amino acid. In the orthogonal system of the project of 2015 SZU-iGEM, the construction of our UAA orthogonal system rely on an orthogonal pair of tRNA(CUA) and an AckRS charging the tRNA with Ack. tRNA(CUA) has an anticodon CUA, which can pair with UAG, the amber mutated stop codon, perfectly. With the help of AckRS, the unnatural amino acid Ack can be incorporated into proteins. aaRS functioning in the form of polycomplex in living cells.^[5-6] Research on Structural Biology and Bioinformatics shows that aaRS can combine with other proteins, forming highly organized complex, to be involved in many vital physiological processes.^[5-6] In the last decade, methods for the translational incorporation of UAAs using orthogonal aaRS-tRNA(CUA) pairs were developed. With modified aaRS which can specifically recognise a type of UAA, the UAA can be site-specifically incorporated to produce a protein with new structure and function or to expand the genetic code. The wild-type pyrrolysyl-tRNA synthatase(PylRS) from Methanosarcina mazei readily accepts a number of lysine derivatives as substrates. This enzyme can further be engineered by mutagenesis to utilize a range of UAAs^[7] and the AckRS that we used in our project is one of them.

We constructed hUPll and AckRS in this plasmid to initiate the expression of AckRS inside bladder cells. When both the hUPll and hTERT promoters are activated in bladder cancer cells, the whole orthogonal system that we have constructed can work efficiently.

Sequence and Features

Assembly Compatibility:

10
COMPATIBLE WITH RFC[10]
12
COMPATIBLE WITH RFC[12]
21
INCOMPATIBLE WITH RFC[21]
Illegal XhoI site found at 1622
23
COMPATIBLE WITH RFC[23]
25
INCOMPATIBLE WITH RFC[25]
Illegal NgoMIV site found at 811
1000
COMPATIBLE WITH RFC[1000]

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-Ack is a kind of unnatural amino acid(UAA) that is close structural analog of Lysine, a canonocal amino acid. In the orthogonal system of the project of 2015 SZU-iGEM, the construction of our UAA orthogonal system rely on an orthogonal pair of tRNA(CUA) and an AckRS charging the tRNA with Ack. tRNA(CUA) has an anticodon CUA, which can pair with UAG, the amber mutated stop codon, perfectly. With the help of AckRS, the unnatural amino acid Ack can be incorporated into proteins. aaRS functioning in the form of polycomplex in living cells.<sup>[4-5]</sup> Research on Structural Biology and Bioinformatics shows that aaRS can combine with other proteins, forming highly organized complex, to be involved in many vital physiological processes.<sup>[4-5]</sup> In the last decade, methods for the translational incorporation of UAAs using orthogonal aaRS-tRNA(CUA) pairs were developed. With modified aaRS which can specifically recognise a type of UAA, the UAA can be site-specifically incorporated to produce a protein with new structure and function or to expand the genetic code. The wild-type pyrrolysyl-tRNA synthatase(PylRS) from Methanosarcina mazei readily accepts a number of lysine derivatives as substrates. This enzyme can further be engineered by mutagenesis to utilize a range of UAAs<sup>[6]</sup> and the AckRS that we used in our project is one of them.
+Ack is a kind of unnatural amino acid(UAA) that is close structural analog of Lysine, a canonocal amino acid. In the orthogonal system of the project of 2015 SZU-iGEM, the construction of our UAA orthogonal system rely on an orthogonal pair of tRNA(CUA) and an AckRS charging the tRNA with Ack. tRNA(CUA) has an anticodon CUA, which can pair with UAG, the amber mutated stop codon, perfectly. With the help of AckRS, the unnatural amino acid Ack can be incorporated into proteins. aaRS functioning in the form of polycomplex in living cells.<sup>[5-6]</sup> Research on Structural Biology and Bioinformatics shows that aaRS can combine with other proteins, forming highly organized complex, to be involved in many vital physiological processes.<sup>[5-6]</sup> In the last decade, methods for the translational incorporation of UAAs using orthogonal aaRS-tRNA(CUA) pairs were developed. With modified aaRS which can specifically recognise a type of UAA, the UAA can be site-specifically incorporated to produce a protein with new structure and function or to expand the genetic code. The wild-type pyrrolysyl-tRNA synthatase(PylRS) from Methanosarcina mazei readily accepts a number of lysine derivatives as substrates. This enzyme can further be engineered by mutagenesis to utilize a range of UAAs<sup>[7]</sup> and the AckRS that we used in our project is one of them.
 We constructed hUPll and AckRS in this plasmid to initiate the expression of AckRS inside bladder cells. When both the hUPll and hTERT promoters are activated in bladder cancer cells, the whole orthogonal system that we have constructed can work efficiently.