Part:BBa_K2279001
AimP
AimP encodes a signal peptide.
Sequence and Features
- 10COMPATIBLE WITH RFC[10]
- 12COMPATIBLE WITH RFC[12]
- 21COMPATIBLE WITH RFC[21]
- 23COMPATIBLE WITH RFC[23]
- 25INCOMPATIBLE WITH RFC[25]Illegal NgoMIV site found at 58
- 1000COMPATIBLE WITH RFC[1000]
Plasmid construction
We used PCR to produce AimP gene fragment.
Then we inserted this gene to plasmid pSB1C3. We transformed this recombinant plasmid (one contains gene AimP) into strain DH5α (E. coli). Then we picked some colonies for cultivation and extracted the recombinant plasmid, which was verified by PCR and sequencing. From the result of electrophoresis, we confirmed the transformation of AimP was success.
Biological Function
The B.subtilis bacteriophage phi3T employs the AimR-AimP QS system to make the lysis-lysogeny decision. AimP is the pre-pro-peptide. It is 43aa long. The mature signal peptide of AimP is SAIRGA. Binding of the mature signal peptide to AimR will disrupt the dimer forms of AimR. After that, the AimR can no longer bind to the promoter of AimX, a potential non coding RNA involved in the process of lysis-lysogeny.
Design
By combining the expression of AimR and AimP components, we want to develop a synthetic QS system in B.subtilis for target gene autoinhibition.
Figure 1. The design of autoinhibiton system
A synthetic communication pathway between B.subtilis strains by co-culturing AimP-producing “sender” cells with AimR-sensing “receiver” cells to inhibit gene expression was also designed.
Figure 2. The design of AimR-AimP based Sender and Receiver cells.
Reference
[1] Erez, Z., Steinberger-Levy, I., Shamir, M., Doron, S., Stokar-Avihail, A., Peleg, Y., Melamed, S., Leavitt, A., Savidor, A., Albeck, S., et al. (2017). Communication between viruses guides lysis-lysogeny decisions. Nature 541, 488-493.
Improvement by Evry_Paris-Saclay 2018
This part is not functional in Escherichia coli even after it has been codon-optimized for it (BBa_K2675001): when expressed in E. coli as the composite part BBa_K2675041, it was not able to produce and release detectable levels the mature hexapeptide SAIRGA in the culturing media of E. coli cells.
This part has been improved to be functional in E. coli: produce and secrete the mature arbitrium peptide of phage phi3T (SAIRGA). For this, the signal secretion of AimP was replaced by the OmpA secretion signal (BBa_K2675002). When expressed in E. coli as the composite part BBa_K2675042, the mature hexapeptide SAIRGA was produced and released in the culturing media of E. coli cells.
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