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<br>3. Aurand TC, March JC. Development of a synthetic receptor protein for sensing inflammatory mediators interferon‐γ and tumor necrosis factor‐α. Biotechnology and Bioengineering. 2016;113(3):492-500. doi:10.1002/bit.25832 | <br>3. Aurand TC, March JC. Development of a synthetic receptor protein for sensing inflammatory mediators interferon‐γ and tumor necrosis factor‐α. Biotechnology and Bioengineering. 2016;113(3):492-500. doi:10.1002/bit.25832 | ||
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===Usage and Biology=== | ===Usage and Biology=== | ||
Revision as of 12:16, 18 October 2021
OmpA/OprF chimeric protein
Description
The OmpA/OprF chimeric protein consists of amino acid sequences from both OmpA transmembrane protein from E. coli and OprF porin protein from P. aeruginosa [1,2]. The newly added loop from OprF allows OmpA/OprF chimeric protein to bind to IFN-γ and initiate a signal transduction to the inner membrane [4].
Biology
Figure 1: Construction of OmpA/OprF chimeric protein
One of the innate functions of OprF is the capability to bind and respond to IFN-γ. Of the four β-barrel loops in OmpA, the first loop is removed and replaced by a loop from OprF, resulting in an OmpA protein with a section of OprF protein. The new extracellular peptides of the OmpA/OprF chimeric protein allows for binding of IFN-γ to the E. coli outer membrane, initiating the phage shock protein (Psp) system and its signal transduction to the inner membrane [3].
Usage
In the IFN-γ sensing system, OmpA/OprF chimeric protein expression is regulated by the ompA promoter. Binding of IFN-γ to the OmpA/OprF chimeric protein activates the pspA promoter, producing the enzyme required for the synthesis of taurine.
Characterization
The ompA/oprF sequence was synthesized by IDT and amplified by PCR. Agarose gel electrophoresis result is shown in Fig. 2.
圖片描述
Expression of OmpA/OprF chimeric protein was confirmed by western blot using anti-OmpA antibody.
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References
1. Wang Y. The Function of OmpA in Escherichia coli. Biochemical and Biophysical Research Communications. 2002;292(2):396-401. doi:10.1006/bbrc.2002.6657 https://pubmed.ncbi.nlm.nih.gov/11906175/
2. Wu L. Recognition of Host Immune Activation by Pseudomonas aeruginosa. Science. 2005;309(5735):774-777. doi:10.1126/science.1112422 https://pubmed.ncbi.nlm.nih.gov/16051797/
3. Aurand TC, March JC. Development of a synthetic receptor protein for sensing inflammatory mediators interferon‐γ and tumor necrosis factor‐α. Biotechnology and Bioengineering. 2016;113(3):492-500. doi:10.1002/bit.25832 Sequence and Features
Assembly Compatibility:
- 10COMPATIBLE WITH RFC[10]
- 12COMPATIBLE WITH RFC[12]
- 21INCOMPATIBLE WITH RFC[21]Illegal BamHI site found at 813
- 23COMPATIBLE WITH RFC[23]
- 25COMPATIBLE WITH RFC[25]
- 1000COMPATIBLE WITH RFC[1000]