Difference between revisions of "Part:BBa K3089013"
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Revision as of 00:38, 21 October 2019
csgA-linker-mfp5-mfp5-His fusion protein for yeast expression
Introduction
This recombinant protein is our own new design which has a property of both cohesion (CsgA) and adhesion (Mfp5). CsgA is an amyloid-like protein encoded on genome of E.coli MG1655 providing mechanical cohesive strength. Mfp5 is mussel foot proteins from Mytilus galloprovincialis responsible for interface adhesion. By adding two Mfp5s to CsgA, we expect it to have a stronger adhesive property. The results show, this recombinant protein can adhere to plastics and glasses better than any otherparts in our toolbox. The sequence of this composite part is optimized to achieve better expression in Pichia pastoris.
Characterization
Three different experiments were done to characterise the BBa_K3089013 biobrick:
- Molecular cloning
- Protein expression
Molecular cloning
![](https://2019.igem.org/wiki/images/d/d4/T--Greatbay_SCIE--molecular_cloning_of_csgA-linker-mfp5-mfp5.jpeg)
CsgA-linker-mfp5-mfp5-His was synthesized and cloned to yeast Pichia pastoris and 1 strain was verified by gel electrophoresis and sequencing (Figure 2).
![](https://2019.igem.org/wiki/images/a/aa/T--Greatbay_SCIE--gene_insertion_gel_csga-mfp5-mfp5.jpeg)
Protein expression
Proteins were expressed in small scale induced by methanol. Unfortunately, no proteins of interest were found in culture medium of CsgA-Mfp5-Mfp5 after induced expression for 48 hours at 30℃(Figure 3).
![](https://2019.igem.org/wiki/images/1/17/T--Greatbay_SCIE--SDS-PAGE_of_CsgA-mfp5-mfp5.jpeg)