Team:SDU-Denmark/project-r

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= Results =
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== Results ==
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== Photosensor ==
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=== Biobrick assembly and sequence ===
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We succesfully assembled the biobrick [http://partsregistry.org/Part:BBa_K343007 K343007], which consists of the TetR repressible promoter R0040 followed by the ribosome binding site B0034, the coding sequence K343003 and the terminators B0010 and B0012.<br>
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This was achieved through "standard" silver assembly and confirmed via sequencing with biobrick verification forward 2 (VF2) and verification reverse (VR) primers.<br>
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<br>
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[http://partsregistry.org/cgi/sequencing/one_blast.cgi?id=8039| Sequencing results K343007]
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<br><br>
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The sequence obtained from sequencing is identical with the theoretical sequence of the part, except for a silent mutation in the coding sequence, which does not change the amino acid sequence.
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'''Photosensor'''<br>
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=== Effect ===
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The results of the motility assay are just in. In this experiment we shone blue light on one half of the plate, while the other half was in the dark. We then placed one colony in each half and observed their motility pattern after 24 hours. We did this for three different strains of E.Coli - DH5alpha, Wildtype Mg1655 and Mg1655 containing a plasmid with our photosensor constitutively on. See the results for yourself:<br>
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Our results from the experiments with semi-solid agar confirms that the bacteria carrying a plasmid with the biobrick have a altered motility, most likely by an alteration in tumbling frequency, when exposed to blue light compared to the wild type MG1655.<br>
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Light shone on the right half of the plates, the left half was in the dark.<br>
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<br>Mg1655 (Wildtype):<br>
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[[Image:Team-SDU-Denmark-MG1655.JPG|250px]]
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<br>Photosensor (Modified Mg1655):<br>
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[[Image:Team-SDU-Denmark-Photosensor.JPG|250px]]<br>
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<br>DH5alpha (Reduced motility):<br>
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[[Image:Team-SDU-Denmark-DH5alpha.JPG|250px]]<br>
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As you can see, both colonies on the photosensor plate moved towards the darker end of their plate, trying to get awaz from the light. Because of the increased tumbling the colony in the light did not move very far, but the little movement that happened was away from the light. On the dark half, the colony moved alot more, because of the decreased tumbling frequency. This is confirmed by the movement towards the darker edge of the plate.<br><br>
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The videomicroscopy indicates that bacteria carrying a plasmid with the biobrick travel father and in a more straight path than the wild type MG1655 when exposed to blue light with a wavelength around 500nm, Thereby suggesting a lowered tubling frequency. <br>
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Computeranalysis of videos recorded of swimming baceria containing this part, indicate that these bacteria have a tendency to swim towards the source of light, when exposed to a light gradient. A trackdiagram was constructed from the gathered data, and swimming bacteria tended to orientate their movement in the direction of the light source. This could mean that blue light acts as an attractant stimulus on the SopII-HtrII-Tar complex. <br><br>
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The stability of pSB1C3-K343007 is most likely <20 generations, however the stability of pSB3T5-K343007 was not determined. <br>
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Plasmids expressing K343007 does not seem to hinder the bacterial growth in any way.<br>
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For further information, raw data and background of the assay see [https://2010.igem.org/Team:SDU-Denmark/K343007 characterization of K343007].
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==Flagella==
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=== Biobrick assembly and sequence ===
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We succesfully assembled the biobrick [http://partsregistry.org/Part:BBa_K343004 K343004], which consists of the TetR repressible promoter R0040 followed by the ribosome binding site B0034, the coding sequence K343000 and the terminators B0010 and B0012.<br>
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This was achieved through "standard" silver assembly and confirmed via sequencing with biobrick verification forward 2 (VF2) and verification reverse (VR) primers.<br>
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<br>
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[http://partsregistry.org/cgi/sequencing/one_blast.cgi?id=8031| Sequencing results for K343004]
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<br><br>
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When comparing the theoretical sequence with the sequence done on the part K343004 the two sequences were identical.
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Video microscopy results:
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=== Effect ===
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Bacteria containing the photosensor will exhibit a lowered tumbling rate when exposed to blue light (wavelengths around 350nm - 450nm). This was analysed with the help of video microscopy and the open source software [http://db.cse.ohio-state.edu/CellTrack/ "CellTrack"]. The individual cells trajectory was tracked and their speed measured. The tracking results are as follows:
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Our results from the motility assay with semi-solid agar confirm that the biobrick does in fact increase the motility of the cells. We believe this is caused by hyperflagellation facilitated by the overexpression of the flhD/C operon. <br>
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The stability of pSB1C3-K343004 is most likely <20 generations, however the stability of pSB3T5-K343004 was not determined.<br>
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The growth assay showed no significant difference between the wild type and the cells containing either pSB1C3-K343004 or pSB3K3-K343004.<br>
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In a phase contrast microscope we observed that MG1655 containing pSB1C3-K343004 was longer that wild type. This support the theory that the cells are hyperflagellated and therefore stays longer in the G2-phase in the cell cycle. 
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For further information, raw data and background of the assay see [https://2010.igem.org/Team:SDU-Denmark/K343004 characterization of K343004]. <br><br>
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== Retinal ==
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=== Biobrick assembly and sequence ===
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We succesfully assembled the biobrick [http://partsregistry.org/Part:BBa_K343006 K343006], which consists of the TetR repressible promoter R0040 followed by the ribosome binding site B0034, the coding sequence K343002 and the terminators B0010 and B0012.<br>
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This was achieved through "standard" silver assembly and confirmed via sequencing with biobrick verification forward 2 (VF2) and verification reverse (VR) primers.<br>
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Sequencing results (as .ab1 files):<br>
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<br>
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[http://partsregistry.org/cgi/sequencing/one_blast.cgi?id=8025| Sequencing results for K343006]
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<br><br>
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When comparing the theoretical sequence with the sequence done on the part K343006 the two sequences was identical.
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=== Effect ===
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UV-Vis spectroskopy and HPLC analysis of organic extractions of the bacteria containing K343006 didn't give conclusive results conserning the Retinal production.<br>
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The stability of pSB1C3-K343006 is most likely <20 generations.<br>
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The growth assay showed no significant difference between the wild type and the cells containing pSB1C3-K343006.<br>
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For further information, raw data and background of the assay see [https://2010.igem.org/Team:SDU-Denmark/K343006 characterization of K343006]
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''From left to right, trajectory of: E.Coli with photosensor exposed to blue light, E.Coli with photosensor exposed to red light and E.Coli Mg1655 Wildtype exposed to blue light: (Blue dots show the location of the cell in the given frame, so the number of dots equals the number of frames from the sample.)''<br>
 
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[[Image:Team-SDU-Denmark-PSblue1.png | 300px]]
 
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[[Image:PSred sample 1 trajectory - Cell 1.png | 300px]]
 
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[[Image:Team-SDU-Denmark-WTblue1.png | 300px]]
 
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The phototaxic bacteria move more in a straight line when exposed to bluelight, as can be seen when comparing the trajectories of the thee bacteria given earlier. These were taken from a batch of 10 cells tracked per sample.
 
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This is where it gets really interesting. Just look what we've made!
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Latest revision as of 02:22, 28 October 2010

Retrieved from "http://2010.igem.org/Team:SDU-Denmark/project-r"