Difference between revisions of "Part:BBa K4907109"

Revision as of 18:11, 10 October 2023

pVSW-3 (18)-B0034-gfp-B0015

Biology

pVSW-3(18)

Some RNA polymerases of eukaryotes and viruses have domains that specifically recognize DNA base sequences, and they are specifically matched with their corresponding promoters.(1) VSW-3 RNAP is encoded by the chillophilic phage VSW-3 in plateau lakes and has low temperature specificity(2). Hengxia et al. characterized pVSW-3 series promoters for the first time and pVSW-3(18) is one of them.

Usage and design

XMU-China has developed a novel RNA polymerase, VSW-3 RNAP and we characterized its potentially useful promoters in order to construct a matching expression system. pVSW-3(18) is one of the more efficient promoters in the series. BBa_K4907109_pSB3K3 was constructed as a reporting circuit, for comparing with pVSW-3(GGG) and pVSW-3(genome). By characterizing these three promoters, we hope to determine the effect of the 3' terminal structure of the promoter for VSW-3 RNAP on its efficiency, and to identify a VSW-3 expression system that can effectively function in E. coli.

Fig. 1 Gene circuit of BBa_K4907109_pSB3K3 and BBa_K4907122_pSB3K3

Characterization

Agarose gel electrophoresis (AGE)

When we were building this circuit, colony PCR was used to certify the plasmid was correct. We got the target fragment-1220bp (lane K4907109).

Fig. 2 The result of colony PCR. Plasmid BBa_K4907109_pSB3K3

Comparison of series promoters: pVSW-3(GGG), pVSW-3(genome)

In order to find a promoter that can function efficiently in Escherichia coli, we constructed BBa_K4907109_pSB3K3(pVSW-3(18)), BBa_K4907112_pSB3K3(pVSW-3(GGG)) and BBa_K4907122_pSB3K3(pVSW-3(genome)) to explore the effect of the structure of the 3' terminal of the promoter on its efficiency. The results are shown in the figure, with BBa_K4907109_pSB3K3 showing the highest efficiency.

Fig. 3 The comparison of normalized fluorescence intensity the promoters pVSW-3(18), pVSW-3(GGG) and pVSW-3(genome). p-value: 0.0021 (**), 0.0002 (***), <0.0001 (****)

Reference

1.S. Borukhov, E. Nudler, RNA polymerase: the vehicle of transcription. Trends in Microbiology 16, 126-134 (2008).

2. H. Xia et al., Psychrophilic phage VSW-3 RNA polymerase reduces both terminal and full-length dsRNA byproducts in in vitro transcription. RNA Biology 19, 1130-1142 (2022).

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]

@@ Line 10: / Line 10: @@
 XMU-China has developed a novel RNA polymerase, VSW-3 RNAP and we characterized its potentially useful promoters in order to construct a matching expression system. pVSW-3(18) is one of the more efficient promoters in the series.    BBa_K4907109_pSB3K3 was constructed as a reporting circuit, for comparing with pVSW-3(GGG) and pVSW-3(genome).
 By characterizing these three promoters, we hope to determine the effect of the 3' terminal structure of the promoter for VSW-3 RNAP on its efficiency, and to identify a VSW-3 expression system that can effectively function in <i>E. coli</i>.
-<center><html><https://static.igem.wiki/teams/4907/wiki/parts/jincheng/biaozhen/pvsw-3-all-gfp.png" width="400px"></html></center>
+<center><html><img src="https://static.igem.wiki/teams/4907/wiki/parts/jincheng/biaozhen/pvsw-3-all-gfp.png" width="400px"></html></center>
 <center><html><B>Fig. 1 Gene circuit of <partinfo>BBa_K4907109</partinfo>_pSB3K3 and <partinfo>BBa_K4907122</partinfo>_pSB3K3 </B></html></center>