Part:BBa_K1825004

35s CaMV

This is the 35s Cauliflower mosaic virus promoter (35 CaMV), a strong constitutive promoter used in eukaryotes. The 35s CaMV promoter is nothing new to the registry, but since this sequence is different from the already existing biobricks, we had to add it to the registry because we used this exact sequence to make a composite part (BBa_K1825006). This exact sequence has also been experimentially validated as follows below.

The 35s CaMV promoter was a part of a larger construct used for transforming moss Physcomitrella patens. We transformed this promoter into Physcomitrella patens as a part of a larger DNA construct (fig. 1). This DNA construct contained in the following order. A homologous region to the 108 locus on the moss genome (to ensure stable integration into P. patens genome), the nptII-resistance gene driven by the 35s cauliflower mosaic virus, the Zea mays ubiquitin promoter driving the antifreeze protein (AFP) linked to yellow fluorescent protein (YFP) with the LP4 linker sequence, terminator and lastly another 108 region.

Figure 1) Gene construct with a gene encoding for an antifreeze protein. The nptII-gene is expressed with the 35s Cauliflower Mosaic virus promoter

Our moss was able to grow from single transformed protoplasts to full clumps on media containing kanamycin (50 mg/ml), which suggests that the nptII-resistance cassette provides P.Patens with resistance to kanamycin (fig. 2).

Figure 2) Moss protoplast a few days after transformation and one month later when grown on kanamycin

To further validate this, we outlined an additional experiment where we grew wild type (WT) moss on either nonselective PhyB-media (3 plates) or PhyB-media containing kanamycin 50 mg/ml (3 plates). After 7 days, there was a visible difference in growth between WT on nonselective media and WT on kanamycin plates (fig. 3). The WT moss planted on kanamycin containing plates grew very little or not at all and is seen under the microscope as withering (fig. 3 B2). This is a stark contrast to our transformed moss that was able to grow from protoplasts to full clumps and the more vibrant WT without kanamycin (fig. 3 A2). This experiment validates the function of the the 35s Cauliflower mosaic virus promoter in P. patens.

Figure 3) Wild type P.patens grown on PhyB-edia with or without kanamycin (50 mg/ml). A) Wild type moss on media without kanamycin. B) Wild type moss grown on kanamycin containing plates (50 mg/ml). C) Wild type moss without kanamycin on top and with kanamycin on bottem. Photo taken 8 days after the moss was planted.

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]