Difference between revisions of "Part:BBa K3089034"
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<partinfo>BBa_K3089034 parameters</partinfo> | <partinfo>BBa_K3089034 parameters</partinfo> | ||
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+ | |||
+ | <html> | ||
+ | |||
+ | |||
+ | <h3>Introduction</h3> | ||
+ | <p> | ||
+ | This composite part is meant to express csgA-linker-mfp5-linker-sfGFP fusion genes under the T7 promoter. CsgA is an amyloid-like protein encoded on genome of E.coli MG1655 providing cohesive mechanical strength. | ||
+ | |||
+ | Mfp5 is mussel foot proteins from Mytilus galloprovincialis responsible for interface adhesion. Compared to T7 promoter+csga-linker-mfp5-linker-His(BBa_K3089021), we have added sfGFP to characterise the expression of the recombinant protein. It is a robustly folded version of GFP, called ‘super folder’ GFP, that folds well even when fused to poorly folded polypeptides (Waldo et al., 2006). | ||
+ | </p> | ||
+ | |||
+ | <h3>Characterization</h3> | ||
+ | |||
+ | |||
+ | <h3> Protein expression </h3> | ||
+ | |||
+ | <html> | ||
+ | <Figure> | ||
+ | <img width="60 | ||
+ | 0px" src="https://2019.igem.org/wiki/images/5/52/T--Greatbay_SCIE--P--034-Figure_1.png"> | ||
+ | </figure> | ||
+ | |||
+ | <figcaption> The circuit of the protein BBa_K30889034 </figcaption> | ||
+ | |||
+ | <p> | ||
+ | The predicted size of rBalcp19k-linker-mfp5 is 28.17 kDa, and the isoelectric point is 10.41. rBalcp19k-linker-mfp5 was cloned into pET28b and expressed in E.coli BL21(DE3) Rosetta by 500μM IPTG for 5h at 37℃. | ||
+ | To detect its expression, whole cells were collected after induction by centrifuging and prepared for SDS-PAGE. Results showed that no protein bands of rBalcp19k-linker-mfp5(~28 kDa) could be observed on lane rBalcp19k-mfp5 compared with lane pET28b (pET28b empty vector)(Figure 1A), which means the expression of this protein is not well in BL21(DE3) Rosetta. | ||
+ | We can get the same results using quantitative densitometry analysis of SDS-PAGE gels (Figure 1B). | ||
+ | </p> | ||
+ | |||
+ | <Figure> | ||
+ | <img width="450px" src="https://2019.igem.org/wiki/images/5/52/T--Greatbay_SCIE--P--034-Figure_1.png"> | ||
+ | </figure> | ||
+ | |||
+ | <figcaption> Figure 2 Detection of the expression level of all recombinant proteins by SDS-PAGE.(A) SDS-PAGE of whole-cell lysates of all recombinant proteins. Red arrows show the predicted place of certain proteins. (B) Protein SDS-PAGE bands optical densities were measured by quantitative densitometry of SDS-PAGE of whole-cell aliquots. </figcaption> | ||
+ | |||
+ | <h3> Protein purification </h3> | ||
+ | |||
+ | <p> | ||
+ | Barnacle cement proteins are very promising in making biomedical bio-glues. rBalcp19K from Balanus albicostatus had the properties of both self-assembly and adhesion. | ||
+ | It also could function in more basic condition than Mfps. Thus we also designed a novel recombinant protein by combining it with Mfp5. We expected rBalcp19k-Mfp5 would perform better adhesive ability to solidify our idea of modularisation of Mfp5. | ||
+ | We tried to purify it under native conditions, and we found bands of rBalcp19K-linker-mfp5 appeared between 25kDa and 35kDa on 12% SDS-PAGE gel(Figure 2), which meant it was successfully expressed and purified under native condition(see details on our methods). | ||
+ | Protein concentrations of rBalcp19k-linker-mfp5 were measured by BCA assay, and its yield is 1mg/L. | ||
+ | |||
+ | <html> | ||
+ | <Figure> | ||
+ | <img width="450px" src="https://static.igem.org/mediawiki/parts/d/d9/T--Greatbay_SCIE--SDS-PAGE_of_rBalcp19k-mfp5.png"> | ||
+ | </figure> | ||
+ | |||
+ | <figcaption> | ||
+ | Figure 3. SDS-PAGE of purified rBalcp19k-mfp5 by affinity chromatography under native conditions. | ||
+ | Lanes: M, protein molecular weight marker; NC, whole-cell sample of pET28b empty vector; WC, whole-cell sample of recombinant protein rBalcp19K; S, soluble cell fraction; W1, fraction. | ||
+ | </figcaption> | ||
+ | |||
+ | <h3> Surface coating analysis </h3> | ||
+ | <p> | ||
+ | After obtaining a small number of recombinant proteins, surface coating analysis for qualitatively assessing the surface adsorption ability of recombinant proteins was conducted on two of most commonly used bio-related surfaces: hydrophilic glass slides and hydrophobic polystyrene tissue culture plates. | ||
+ | As shown in Figure3, rBalcp19k-linker-mfp5 recombinant protein showed higher surface absorption abilities on both different substrates than rBalcp19k without fusion of mfp5 on its C-terminal. | ||
+ | It’s suggested that Mfp improves the coating ability of rBalcp19k-linker-mfp5 fusion proteins. The In-vitro DOPA modification by mTyr-CNK tyrosinase significantly improved its surface absorption abilities, which suggested the positive contribution of DOPA in adhesive protein performances. | ||
+ | </p> | ||
+ | |||
+ | <Figure> | ||
+ | <img width="450px" src="https://static.igem.org/mediawiki/parts/8/8e/T--Greatbay_SCIE--P--Surface_coating.jpeg"> | ||
+ | </figure> | ||
+ | |||
+ | <figcaption> | ||
+ | Figure 4. Surface coating analysis of recombinant proteins on hydrophilic glass slides (left) and hydrophobic polystyrene (PS) plates (right). | ||
+ | </figcaption> |
Revision as of 07:57, 20 October 2019
T7 promoter+csgA-linker-mfp5-linker-sfGFP
T7 promoter+csgA-linker-mfp5-linker-sfGFP, sfGFP as marker
Sequence and Features
- 10INCOMPATIBLE WITH RFC[10]Illegal XbaI site found at 47
Illegal PstI site found at 400 - 12INCOMPATIBLE WITH RFC[12]Illegal PstI site found at 400
- 21INCOMPATIBLE WITH RFC[21]Illegal BamHI site found at 585
- 23INCOMPATIBLE WITH RFC[23]Illegal XbaI site found at 47
Illegal PstI site found at 400 - 25INCOMPATIBLE WITH RFC[25]Illegal XbaI site found at 47
Illegal PstI site found at 400 - 1000INCOMPATIBLE WITH RFC[1000]Illegal SapI.rc site found at 780
Introduction
This composite part is meant to express csgA-linker-mfp5-linker-sfGFP fusion genes under the T7 promoter. CsgA is an amyloid-like protein encoded on genome of E.coli MG1655 providing cohesive mechanical strength. Mfp5 is mussel foot proteins from Mytilus galloprovincialis responsible for interface adhesion. Compared to T7 promoter+csga-linker-mfp5-linker-His(BBa_K3089021), we have added sfGFP to characterise the expression of the recombinant protein. It is a robustly folded version of GFP, called ‘super folder’ GFP, that folds well even when fused to poorly folded polypeptides (Waldo et al., 2006).
Characterization
Protein expression
![](https://2019.igem.org/wiki/images/5/52/T--Greatbay_SCIE--P--034-Figure_1.png)
The predicted size of rBalcp19k-linker-mfp5 is 28.17 kDa, and the isoelectric point is 10.41. rBalcp19k-linker-mfp5 was cloned into pET28b and expressed in E.coli BL21(DE3) Rosetta by 500μM IPTG for 5h at 37℃. To detect its expression, whole cells were collected after induction by centrifuging and prepared for SDS-PAGE. Results showed that no protein bands of rBalcp19k-linker-mfp5(~28 kDa) could be observed on lane rBalcp19k-mfp5 compared with lane pET28b (pET28b empty vector)(Figure 1A), which means the expression of this protein is not well in BL21(DE3) Rosetta. We can get the same results using quantitative densitometry analysis of SDS-PAGE gels (Figure 1B).
![](https://2019.igem.org/wiki/images/5/52/T--Greatbay_SCIE--P--034-Figure_1.png)
Protein purification
Barnacle cement proteins are very promising in making biomedical bio-glues. rBalcp19K from Balanus albicostatus had the properties of both self-assembly and adhesion.
It also could function in more basic condition than Mfps. Thus we also designed a novel recombinant protein by combining it with Mfp5. We expected rBalcp19k-Mfp5 would perform better adhesive ability to solidify our idea of modularisation of Mfp5.
We tried to purify it under native conditions, and we found bands of rBalcp19K-linker-mfp5 appeared between 25kDa and 35kDa on 12% SDS-PAGE gel(Figure 2), which meant it was successfully expressed and purified under native condition(see details on our methods).
Protein concentrations of rBalcp19k-linker-mfp5 were measured by BCA assay, and its yield is 1mg/L.
Surface coating analysis
After obtaining a small number of recombinant proteins, surface coating analysis for qualitatively assessing the surface adsorption ability of recombinant proteins was conducted on two of most commonly used bio-related surfaces: hydrophilic glass slides and hydrophobic polystyrene tissue culture plates. As shown in Figure3, rBalcp19k-linker-mfp5 recombinant protein showed higher surface absorption abilities on both different substrates than rBalcp19k without fusion of mfp5 on its C-terminal. It’s suggested that Mfp improves the coating ability of rBalcp19k-linker-mfp5 fusion proteins. The In-vitro DOPA modification by mTyr-CNK tyrosinase significantly improved its surface absorption abilities, which suggested the positive contribution of DOPA in adhesive protein performances.
![](https://static.igem.org/mediawiki/parts/8/8e/T--Greatbay_SCIE--P--Surface_coating.jpeg)