Team:Washington/Magnetosomes/Magnet Results
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[[File:Washington_Igem2011_mamK_and_I.png|800px|center]] | [[File:Washington_Igem2011_mamK_and_I.png|800px|center]] | ||
- | The results we obtained with our sfGFP fusions inside ''E.coli'' were comparable to those done through other studies in the host organism ''Magnetospirillum magneticum''. Within AMB-1, mamK is a filament which runs through the length of the bacteria. In our image of mamK, a filament is seen running through the length of ''many'' bacteria. In our experimental result, there was an over- expression of mamK which connected the ''E.coli'' cells together. | + | The results we obtained with our sfGFP fusions inside ''E.coli'' were comparable to those done through other studies in the host organism ''Magnetospirillum magneticum''. Within AMB-1, mamK is a filament which runs through the length of the bacteria. In our image of mamK, a filament is seen running through the length of ''many'' bacteria. In our experimental result, there was an over- expression of mamK which connected the ''E.coli'' cells together. |
Revision as of 08:13, 28 September 2011
What’s in the Magnetosome Toolkit?
- Our favorite genes in pGA vectors
- A set of the 18 essential genes for the various steps of magnetosome formation
- A table compiling individual gene functions from our literature search
Our favorite genes in pGA vectors: Magnetosome gene-protein Fusions
As previously stated, our genes of interest were mamK and mamI as they have functions related to localization of the magnetosome. Specifically, mamK is a bacterial actin-like cytoskeleton protein required for proper alignment of the magnetosomes in a chain. mamK is also shown to localize the mamI, which is loss inhibits membrane formation. (for other gene functions, please see the iGEM Toolkits parts submitted page)Using our two genes of interest, we created C-terminal sfGFP fusions so we could track the localization of each gene separately within E.coli.
The results we obtained with our sfGFP fusions inside E.coli were comparable to those done through other studies in the host organism Magnetospirillum magneticum. Within AMB-1, mamK is a filament which runs through the length of the bacteria. In our image of mamK, a filament is seen running through the length of many bacteria. In our experimental result, there was an over- expression of mamK which connected the E.coli cells together.
For mamI, the gene product is seen to fluoresce around the bacterial cell membrane of the bacteria but mostly concentrated at the ends. This is seen in the graph that was taking while imaging the cells. The graph shows that as the arrow crosses the cell membrane, the fluorescent peaks are at a maximum, and through the center of the cell, the level of fluorescence decreases.
Construction of the R5 region of the Magnetosome Island in E.coli
After identifying that the construction of the scaffold had worked, we proceeded to work on the final assembly in three parts: mamHIEJKK, mamMNOPA, and mamQRBSTUV. The PCR products of the first, and the third part of the assembly are shown below. Both fragments of the assembly have been partially sequenced confirmed, and we are currently working on designing primers to fill in the gap sequences. Despite these gaps, when this samples were imaged, filaments in the first part (mamHIEJKL)were still apparent.
![Washington iGEM2011 magentosome HIEJKL3k3.png](/wiki/images/0/01/Washington_iGEM2011_magentosome_HIEJKL3k3.png)
![Washington iGEM2011 magentosome MNOPA.png](/wiki/images/1/15/Washington_iGEM2011_magentosome_MNOPA.png)
![Washington iGEM2011 magentosome QRBSTUV.png](/wiki/images/3/36/Washington_iGEM2011_magentosome_QRBSTUV.png)
A set of the 18 essential genes for the various steps of magnetosome formation
Before piecing together the 16 kb genome of the mamAB gene cluster within the magnetosome island (MAI), we extracted out the genes in the following groups:
Gene groups | Length (bp) |
---|---|
mamHI | 1541 |
mamE | 2172 |
mamJ | 1538 |
mamKL | 1336 |
mamMN | 2323 |
mamO | 1914 |
mamPA | 1493 |
mamQRB | 2029 |
mamSTU | 2030 |
mamV | 1002 |
A table of individual gene functions
Please see the bottom of our parts submitted page.