Difference between revisions of "Part:BBa K5322000"

Revision as of 10:14, 30 September 2024

Constitutive Mfp3 Expression System

Nitric-oxide-inducible lysis module

Usage and Biology

The plasmid pET29a-J23119-RBS-Mfp3-T7 utilizes the pET29a vector for high-level expression of the mussel foot protein Mfp3 in Escherichia coli. This system is controlled by the strong constitutive promoter J23119, which regulates Mfp3 expression. The ribosome binding site (RBS) ensures efficient translation of the mRNA, while the T7 terminator provides a clean and efficient transcriptional endpoint. This system is designed for the efficient expression of Mfp3 under stable environmental conditions, allowing it to exert its adhesive properties.

Construction of the plasmid

To enable the expression of eukaryotic proteins in prokaryotes, we selected Escherichia coli BL21(DE3) as the host cell. For efficient expression of the adhesin, we chose the strong promoter J23119 as the regulatory element. As shown in Figure 2-1, we designed the plasmid pET29a-J23119-RBS-Mfp3-T7. Through homologous recombination, we integrated this plasmid into BL21(DE3) and selected individual bacterial colonies from several transformation plates for plasmid extraction. We performed PCR verification using specific primers targeting a 422 bp fragment, as depicted in Figure 2-2. The plasmids with correctly sized bands were sequenced, and the sequencing results in Figure 2-3 confirmed the successful construction of the plasmid pET29a-J23119-RBS-Mfp3-T7.

Figure 2-1 Plasmid pET29a-pJ23119-SoxR-T-pSoxS-RBS-Mfp3-T7

Figure 2-2Colony PCR gel electrophoresis of plasmid pET29a-pJ23119-SoxR-T-pSoxS-RBS-Mfp3-T7(422bp)

Figure 2-3Figure 2-3 Sequencing results of plasmid pET29a-J23119-RBS-Mfp3-T7

Protein Expression Validation

We verified the performance of the lysis module through dry experiments and plan to complete wet experimental validation of its lytic function in the future. Through literature review and numerical modeling validation, we found that after inducing the expression of antimicrobial peptides and lysis proteins with NO for twenty minutes, the engineered strain will be lysed by the lysis protein and release the antimicrobial peptides. Mathematical modeling confirmed that at this time, the concentration of antimicrobial peptides is sufficient to reach an effective inhibitory concentration.

Figure 2-1 Plasmid pET29(a)-pJ23119-SoxR-T-pSoxS-RBS-Mfp3-T7

Sequence and Features