Part:BBa_K4244012

Rhamose inducible sfGFP with SEC-N22 secretion tag

sfGFP BBa_K4244004 was fused to SEC-N22 BBa_K2895007 (fused at the N-terminus) to secrete sfGFP and use it as an extracellular reporter. It is under an inducible promoter BBa_K914003. For better titration using BBa_K914003 we introduced the plasmid in a Δ rhaB,Δ rhaT strain [1].

Secretion assay

Figure 1: End point measurement of total, pellet and supernatant fraction of sfGFP under the SEC-N22 signal peptide expressed with rhamnose inducible promoter. Measurement was performed 5 hours after rhamnose induction at 500 μM. No significant fluorescence was detected in the supernatant fraction.

Discussion

No secretion was observed in Escherichia coli Nissle 1917. This experiment still need adjustment and fine tuning to prove the secretion of sfGFP.

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]

References

1. Hjelm A, Karyolaimos A, Zhang Z, Rujas E, Vikström D, Slotboom DJ, et al. Tailoring Escherichia coli for the l -Rhamnose PBAD Promoter-Based Production of Membrane and Secretory Proteins. ACS Synth Biol. 2017;6(6):985–94.