Part:BBa_K4907042

pVSW-3 (19)

Biology

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 psychrophilic 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(19) is one of them.

Usage and Design

In order to construct a matching expression system of the VSW-3 RNAP, we characterized its potentially useful promoters using RFP (BBa_K4907037) as the reporter. pVSW-3(19) is one of the more efficient promoters in the series. Different sub parts were assembled into pSB3K3 plasmid backbone to get the composite part BBa_K4907110 (Fig. 1). The plasmid was transformed into E. coli DH5α and the positive transformants were confirmed by kanamycin, colony PCR and sequencing.

Fig. 1 Gene circuit of pVSW-3 series promoter reporting circuit

Characterization

Agarose gel electrophoresis (AGE)

When building this circuit, colony PCR was used to certify the plasmid was correct. We got the target fragment-1201 bp (lane K4907130).

Fig. 2 The result of colony PCR. Plasmid BBa_K4907130_pSB3K3

Comparison of series promoters from pVSW-3(19) to pVSW-3(16)

The regulatory plasmid containing VSW-3 RNAP and the expressive plasmids with different promoters were transformed into E. coli BL21(DE3). The correct dual-plasmid system was confirmed by chloramphenicol and kanamycin. We characterized the series promoters from pVSW-3(19) to pVSW-3(16) using RFP under 25 ℃. As shown in Fig. 3, pVSW-3(19), pVSW-3(18), and pVSW-3(17) showed better than pVSW-3(16).

Fig. 3 The comparison of normalized fluorescence intensity the series promoters from pVSW-3(19) to pVSW-3(16).

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]