Difference between revisions of "Part:BBa K4765110"
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====Aggregation Assay==== | ====Aggregation Assay==== | ||
| − | We conducted aggregation experiments to validate intimin-LCA's role in mediating the binding of ''E.coli'' and ''Synechococcus elongatus''. Specifically， bacterial solutions of aTc-induced/not-induced intimin-LCA ''E.coli'' + ''Synechococcus elongatus'', were mixed in a 1:1 ratio ( | + | We conducted aggregation experiments to validate intimin-LCA's role in mediating the binding of ''E.coli'' and ''Synechococcus elongatus''. Specifically， bacterial solutions of aTc-induced/not-induced intimin-LCA ''E.coli'' + ''Synechococcus elongatus'', were mixed in a 1:1 ratio (600 μL per strain per tube, independent experiment repeat 3 times) and allowed to settle. Sampling was performed at 0, 2, 6, and 24 hours by collecting 100 μL aliquots from the upper 25% of each mixture (supernatant) in each tube at each time point. These samples were transferred to EP tubes and stored at 4 ℃ until the final sampling. Afterward, they were resuspended and transferred to a 96-well assay plate for OD600 and OD685 measurements. The percentage of bacteria remaining in the supernatant at 6 hours was determined by dividing the bacterial count at 6 hours (as quantified by the OD600 and OD685 measurements) by the bacterial count at 0 hours. |
As shown in Figure 3, at 6 hours, in the aTc-induced ''E. coli'' / ''Synechococcus elongatus'' samples, the bacteria percentage remaining in the supernatant was significantly lower compared to the uninduced samples. As shown in Figure 3, For aTc-induced intimin-LCA ''E.coli'' / ''Synechococcus elongatus'' mixed samples, the bacterial count at 6 hours and 24 hours was significantly lower than the uninduced type. These results suggest that intimin-LCA can facilitate the binding between the two entities and promote biofilm formation. | As shown in Figure 3, at 6 hours, in the aTc-induced ''E. coli'' / ''Synechococcus elongatus'' samples, the bacteria percentage remaining in the supernatant was significantly lower compared to the uninduced samples. As shown in Figure 3, For aTc-induced intimin-LCA ''E.coli'' / ''Synechococcus elongatus'' mixed samples, the bacterial count at 6 hours and 24 hours was significantly lower than the uninduced type. These results suggest that intimin-LCA can facilitate the binding between the two entities and promote biofilm formation. | ||
Revision as of 15:49, 12 October 2023
Twister P1 + T7_RBS + intimin-LCA fusion + stem-loop
Contents
Introduction
We’ve developed an E. coli-cyanobacteria adhesion module by transfecting intimin-LCA fusion. Intimin-LCA fusion is composed of intimin and LCA. LCA is a lectin from Lentils that can recognize α-linked mannose residues. It is a common lectin that can specifically bind to the LPS on the surface of S. elongatus PCC7942. Intimin includes a short N-terminal signal peptide to direct its trafficking to the periplasm, a LysM domain for peptidoglycan binding, and a beta-barrel for transmembrane insertion[1] , possesses the outer membrane anchoring of LCA.
Usage and Biology
This biological component delivers LCA to the surface of E. coli, facilitating adhesion between E. coli, and S. elongatus PCC7942. We envision that the adhesion between cyanobacteria and E. coli can promote the exchange of substances within the biofilm, enhancing the biofilm's survivability.
Characterization
Sequencing map
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| Figure 1. Sequencing map of LCA
Sequencing is performed using the primer：Kan-F: 5-ATTCTCACCGGATTCAGT-3. |
Successful Protein Expression
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| Figure 2. SDS-PAGE electrophoresis of intimin-LCA
We constructed intimin-LCA into the pDSG plasmid and transformed it into E. coli DH5α. Lane 1 to 2 represent intimin-LCA and intimin-LCA + aTc. As indicated by the red arrow, we successfully expressed intimin-LCA. Aggregation AssayWe conducted aggregation experiments to validate intimin-LCA's role in mediating the binding of E.coli and Synechococcus elongatus. Specifically， bacterial solutions of aTc-induced/not-induced intimin-LCA E.coli + Synechococcus elongatus, were mixed in a 1:1 ratio (600 μL per strain per tube, independent experiment repeat 3 times) and allowed to settle. Sampling was performed at 0, 2, 6, and 24 hours by collecting 100 μL aliquots from the upper 25% of each mixture (supernatant) in each tube at each time point. These samples were transferred to EP tubes and stored at 4 ℃ until the final sampling. Afterward, they were resuspended and transferred to a 96-well assay plate for OD600 and OD685 measurements. The percentage of bacteria remaining in the supernatant at 6 hours was determined by dividing the bacterial count at 6 hours (as quantified by the OD600 and OD685 measurements) by the bacterial count at 0 hours. As shown in Figure 3, at 6 hours, in the aTc-induced E. coli / Synechococcus elongatus samples, the bacteria percentage remaining in the supernatant was significantly lower compared to the uninduced samples. As shown in Figure 3, For aTc-induced intimin-LCA E.coli / Synechococcus elongatus mixed samples, the bacterial count at 6 hours and 24 hours was significantly lower than the uninduced type. These results suggest that intimin-LCA can facilitate the binding between the two entities and promote biofilm formation.
Sequence and Features
Assembly Compatibility:
Reference |
- ↑ Piñero-Lambea, C., Bodelón, G., Fernández-Periáñez, R., Cuesta, A. M., Álvarez-Vallina, L., & Fernández, L. Á. (2015). Programming controlled adhesion of E. coli to target surfaces, cells, and tumors with synthetic adhesins. ACS Synthetic Biology, 4(4), 463–473. https://doi.org/10.1021/sb500252a