Part:BBa_K1916118

Ara-Inducible CBCR8 Expression System

A GAF domain of a cyanobacteriochrome (CBCR) designated CBCR8, found through metagenomic mining and predicted to appear yellow by the 2016 Davis team's CBCR color predictive program, with an intein/chitin-binding domain fused to the C-terminus for purification. Expression regulated by a pBAD promoter. Cells did not appear to express photoactive proteins, suggesting that the protein requires a different organic co-factor other than phycocyanobilin.

Characterization

The ara-inducible system was cloned into pSB1C3 and co-transformed into DH5-alpha cells along with a plasmid containing heme oxygenase and PcyA. After growing the cells to OD=0.9-1 in Terrific Broth, the cultures were induced to a final culture concentration of 1mM arabinose to study the color of the cells once harvested (Fig.1).

Fig.1 Comparison of pellets from a negative control strain (left) and from cells spun down 4 hrs after being induced (right).

Fig.2 Absorbance spectra of the CBCR8 protein extracted from the cells. No peak absorbance was observed.

Sequence and Features

Assembly Compatibility:

• 10
  INCOMPATIBLE WITH RFC[10]

  Illegal XbaI site found at 131
  Illegal SpeI site found at 743
  
• 12
  INCOMPATIBLE WITH RFC[12]

  Illegal NheI site found at 125
  Illegal SpeI site found at 743
  
• 21
  INCOMPATIBLE WITH RFC[21]

  Illegal BamHI site found at 65
  
• 23
  INCOMPATIBLE WITH RFC[23]

  Illegal XbaI site found at 131
  Illegal SpeI site found at 743
  
• 25
  INCOMPATIBLE WITH RFC[25]

  Illegal XbaI site found at 131
  Illegal SpeI site found at 743
  Illegal NgoMIV site found at 1239
  Illegal AgeI site found at 1329
  
• 1000
  COMPATIBLE WITH RFC[1000]