Part:BBa_K1926021

The SNAP-VIKA UNIT

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
  INCOMPATIBLE WITH RFC[25]

  Illegal NgoMIV site found at 419
  
• 1000
  COMPATIBLE WITH RFC[1000]

This part is the SNAP-VIKA UNIT of cyclebow including a SNAP UNIT and a VIKA UNIT. The SNAP UNIT, which can be cut off by CRE, includes an sv40 nuclear location sequence (NLS), a covalent labeling of fusion proteins named SNAP-tag® and an sv40 terminator flanked by homodromous recognition site of recombinase CRE named loxP. The VIKA UNIT, which can be cut off by VIKA, includes an sv40 nuclear location sequence (NLS), a recombinase gene named VIKA and an sv40 terminator flanked by homodromous recognition site of recombinase VIKA named Vox.

Figure 1: The map of the SNAP-VIKA UNIT.

Usage

You may use this part to:

1) Test the cut-off efficiency of recombinase CRE and VIKA by qRT-PCR;

2) Estimate the time needed for genome repair because VIKA can only be expressed after the cut off of SNAP UNIT and genome repair;

3) Fast cut off this part by transient transfecting recombinase gene into nucleus;

4) When there is no CRE, you can use this part as the SNAP UNIT, which can help localize proteins in vivo with BLOCK and dye from NEB company.

Source

The SNAP-tag® was brought from NEB company. NLS and sv40 terminator were got from commercial plasmid: pentry nls GFP/pcdna3.1. The recombinase gene VIKA and its RTS Vox were got through denovo synthesis.

Construction Design

The SNAP-tag® and VIKA with tags and RTSs are constructed using PCR and oligonucleotide ligation by the following procedure. Our UNITs all contain XbaI and SpeI enzyme sites, so we can easily line up the UNITs using 3A assembly.

Figure 2: Three steps to construct our UNITs using PCR and oligonucleotide ligation.

Gel analysis after EcoR1 digestion

The length of our biobricks are confirmed by gel analysis after EcoR1 digestion. The biobrick BBa_R0040, which is the negative control in 2016’s interlab, was used as a control because it only have a 54 bp part.

Figure 3: AGE image of biobricks BBa_K1926001-BBa_K1926003. The samples were pre dyed with gelred