Part:BBa_K4488011

Fusion of free-use GFP with CBDclos (cellulose-binding domain) at the C-terminal end with a linker

The construct can be cloned into an expression vector such as pET28c in E.coli to produce a fusion protein of fuGFP with CBDclos. The fuGFP sequence is towards the N terminus of the protein with CBDclos (BBa_K4488022 ) downstream followed by a stop codon. Recognition sites for BamHI and BsaI are present before the RBS allowing golden gate cloning. XhoI and BsaI are also present downstream of the stop codon.

Usage and Biology

Our project provided preliminary evidence that CBD and cellulose can be used to purify proteins by using fuGFP-linker-CBDclos.

Figure 1: Fluorescence measurements of filter paper binding test with fuGFP-linker-CBDs. 200 uL of TOP10-pUS250v3-fuGFP-CBD cell lysate was added to a 5 mm diameter paper filter disk and incubated for 1 h before washing with 200 uL NT buffer. Fluorescence measurements show that lysate with fusion proteins with the added linker exhibit more fluorescence than control cell lysate and makes the filter disks fluorescent.. fuGFP-linker-CBDcipA causes the greatest gain in fluorescence by paper filter disks.

The linker improved the solubility and fluorescence of the sequence. Below is the fluorescence assay depicting a higher reading compared to our previous construct BBa_K44880007 :

Figure 2: Fluorescence readings of fuGFP-linker-CBDs compared to fuGFP-CBDs in different E.coli plasmids. The uninduced and induced plasmids are also compared.

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 AgeI site found at 163
  
• 1000
  COMPATIBLE WITH RFC[1000]