Part:BBa_K3989010
plant immune elicitor flg22 fused with ClyA for OMV display
In this construct, outer membrane-associated protein ClyA (Part:BBa_K811000) is used to display the plant immune elicitor flg22 (Part:BBa_K3286138) on the surface of bacterial outermembrane vesicles (OMVs) to trigger plant immune responses. To make flg22 better recognized by plant immune receptor FLS2, we put mutiple linkers and a 3×FLAG tag between ClyA and flg22 to minimize the steric hindrance.
By doing western blot using anti-FLAG antibody, we proved that ClyA-elicitor fusion proteins indeed exist in OMVs (Figure 1).
Figure 1. ClyA protein with or without elicitor fused exists in outer membrane vesicles of E. coli omp8 strain.
The immunogenicity of engineered OMVs was tested by Seedling Growth Inhibition (SGI) assay (Figure 2 & 3）, in which lower seedling weight means higher immune responses are triggered (due to the trade-off between immunity and growth). Two OMV-producing E. coli<i> strains were used, omp8 and <i>tolB<i>. In both strain, ClyA-flg22 and ClyA-elf18 can trigger stronger immune responses.
Figure 2.
Figure 3.
Sequence and Features
- 10INCOMPATIBLE WITH RFC[10]Illegal PstI site found at 1105
- 12INCOMPATIBLE WITH RFC[12]Illegal PstI site found at 1105
- 21COMPATIBLE WITH RFC[21]
- 23INCOMPATIBLE WITH RFC[23]Illegal PstI site found at 1105
- 25INCOMPATIBLE WITH RFC[25]Illegal PstI site found at 1105
Illegal NgoMIV site found at 1099
Illegal AgeI site found at 1063 - 1000COMPATIBLE WITH RFC[1000]
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