Difference between revisions of "Part:BBa K3930014"
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<h3>Production of β-carotene (BBa_K3930003)</h3> | <h3>Production of β-carotene (BBa_K3930003)</h3> | ||
| − | <p> All the experiments that characterized this part are related to the final construct<a href="https://parts.igem.org/Part:BBa_K3930003" class="pr-0" target="_blank">(BBa K3930003) </a>, which was cloned into the <i>S. cerevisiae</i> LycoYeast strain. For more information on the experimental background, please refer to this part.</p> | + | <p> All the experiments that characterized this part are related to the final construct <a href="https://parts.igem.org/Part:BBa_K3930003" class="pr-0" target="_blank">(BBa K3930003) </a>, which was cloned into the <i>S. cerevisiae</i> LycoYeast strain. For more information on the experimental background, please refer to this part.</p> |
<p>The promoter controls in the pFRAMBOISE-notfused construct the expression of the CrtY gene, which converts lycopene to β-carotene. The production of β-carotene is therefore a control of the functionality when the expression is induced with doxycycline. The carotenoids produced by the LcyE part of our enzymatic fusion, are contained in the cells. They were extracted using the method described by López et al. (2020). Yeast cells were lysed in acetone using glass beads and the supernatant obtained after lysis was analyzed by RP-HPLC on a C18 column. In the LycoYeast-pFRAMBOISE-notfused strains (which express the LcyE-ofCCD1 fusion), Figure 1 shows that lycopene is converted into a new product with a higher retention time. Considering the β-ionone production results, we concluded this new peak most likely corresponds to β-carotene. Nonetheless, the peak is also observed in the condition with no induction. It seems like there is no negative regulation of the promoter TetO7.</p> | <p>The promoter controls in the pFRAMBOISE-notfused construct the expression of the CrtY gene, which converts lycopene to β-carotene. The production of β-carotene is therefore a control of the functionality when the expression is induced with doxycycline. The carotenoids produced by the LcyE part of our enzymatic fusion, are contained in the cells. They were extracted using the method described by López et al. (2020). Yeast cells were lysed in acetone using glass beads and the supernatant obtained after lysis was analyzed by RP-HPLC on a C18 column. In the LycoYeast-pFRAMBOISE-notfused strains (which express the LcyE-ofCCD1 fusion), Figure 1 shows that lycopene is converted into a new product with a higher retention time. Considering the β-ionone production results, we concluded this new peak most likely corresponds to β-carotene. Nonetheless, the peak is also observed in the condition with no induction. It seems like there is no negative regulation of the promoter TetO7.</p> | ||
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Revision as of 17:58, 16 October 2021
Doxycycline inducible promoter
Sequence and Features
- 10COMPATIBLE WITH RFC[10]
- 12COMPATIBLE WITH RFC[12]
- 21INCOMPATIBLE WITH RFC[21]Illegal BamHI site found at 282
Illegal XhoI site found at 239 - 23COMPATIBLE WITH RFC[23]
- 25COMPATIBLE WITH RFC[25]
- 1000COMPATIBLE WITH RFC[1000]
Introduction
The promoter TetO7 is an doxycycline-inducible promoter. It must be used with the part coding for the activator protein rtTA advanced (BBa_K3930019). The sequence comes from the publication Garí et al. (1997).
Results
Production of β-carotene (BBa_K3930003)
All the experiments that characterized this part are related to the final construct (BBa K3930003) , which was cloned into the S. cerevisiae LycoYeast strain. For more information on the experimental background, please refer to this part.
The promoter controls in the pFRAMBOISE-notfused construct the expression of the CrtY gene, which converts lycopene to β-carotene. The production of β-carotene is therefore a control of the functionality when the expression is induced with doxycycline. The carotenoids produced by the LcyE part of our enzymatic fusion, are contained in the cells. They were extracted using the method described by López et al. (2020). Yeast cells were lysed in acetone using glass beads and the supernatant obtained after lysis was analyzed by RP-HPLC on a C18 column. In the LycoYeast-pFRAMBOISE-notfused strains (which express the LcyE-ofCCD1 fusion), Figure 1 shows that lycopene is converted into a new product with a higher retention time. Considering the β-ionone production results, we concluded this new peak most likely corresponds to β-carotene. Nonetheless, the peak is also observed in the condition with no induction. It seems like there is no negative regulation of the promoter TetO7.
This promoter TetO7 isn't negatively regulated and is always actived under those lab conditions.
References
- Garí E, Piedrafita L, Aldea M, Herrero E. 1997. A set of vectors with a tetracycline-regulatable promoter system for modulated gene expression in Saccharomyces cerevisiae. Yeast. 13(9):837–848. doi:10.1002/(SICI)1097-0061(199707)13:9<837::AID-YEA145>3.0.CO;2-T.