Part:BBa_K2582018

lpp promoter-tRNALys3-Spinach2.1

This part is a constitutive expression cassette of a RNA reporter that can be used to measure promoter activity directly. It contains the light-up RNA Aptamer K1330000in the human tRNALys3 scaffold.

Usage and Biology

The Spinach aptamer and its derivatives allow the docking of fluorogen 3,5-difluoro-4-hydroxybenzylidene imidazolinone (DFHBI) and increases its quantum yields by hundreds of folds. By surrounding it with a tRNA scaffold, its folding in cell can be enhanced and its expression level can be stabilized.

Characterization

This aptamer can be expressed in E. coli DH5a under a constitutive lpp promoter. Comparing the 3 RNA reporters we constructed and the pre-existed Spinach2.1, Spinach2.1 is moderately less bright.

Fluorescence data obtained from plate reader. DH5a transformed with pSB1C3-lpp-Spinach2.1 or other Spinach variants were incubated overnight at 37 degrees Celsius. Overnight culture was normalized to OD=0.2 and incubated in 200uM DFHBI for 45 minutes. N=1. More replicates are needed.

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]