Difference between revisions of "Team:Nagahama/Medal Parts"

(Geraniol production device)
(Precursor of terpene mass-production device)
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We created 30 new BioBrick devices[https://2015.igem.org/Team:Nagahama/Parts] for silver medal criterion. And have submitted them to Registry.
 
We created 30 new BioBrick devices[https://2015.igem.org/Team:Nagahama/Parts] for silver medal criterion. And have submitted them to Registry.
 
===Precursor of terpene mass-production device===
 
===Precursor of terpene mass-production device===
[[File:パーツ画像 MEP .png|550px]]
+
[[File:パーツ画像 MEP .png]]
 
○protocol [https://2015.igem.org/Team:Nagahama/Design#Analysis_of_ubiquinone-8_synthesized_by_E._coli here]
 
○protocol [https://2015.igem.org/Team:Nagahama/Design#Analysis_of_ubiquinone-8_synthesized_by_E._coli here]
 
<div><ul>  
 
<div><ul>  

Revision as of 05:32, 15 September 2015

Team Nagahama banner.jpg


BioBrick Parts to achieve each medal requirement

Bronze

We created 30 new BioBricks[1] for bronze medal criterion. And have submitted them to Registry.
We introduce ispA ([http://parts.igem.org/Part:BBa_K1653003 BBa_K1653003]) of them. This biobrick is Key BioBrics in "Flavorator" project. ispA encodes Farnesyl diphosphate synthase. Farnesyl diphosphate synthase can utilize both dimethylallyl and geranyl diphosphates as substrates, generating geranyl and farnesyl diphosphate, respectively. Therefore the enzyme can catalyze two sequential reactions in the polyisoprenoid biosynthetic pathway.

Silver

We created 30 new BioBrick devices[2] for silver medal criterion. And have submitted them to Registry.

Precursor of terpene mass-production device

パーツ画像 MEP .png ○protocol here

  • Analysis of ubiquinone-8 synthesized byE. coli JM109/[http://parts.igem.org/wiki/index.php?title=Part:BBa_K1653025 BBa_K1653025]
     by thin-layer chromatography (TLC) Right lane: IPTG Left lane: IPTG minus
  • Estimation of ubiquinone-8 content in spot Each intensity of spots indicating the content of ubiquinone-8

Analysis of ubiquinone-8 synthesized by E. coli JM109/[http://parts.igem.org/wiki/index.php?title=Part:BBa_K1653025 BBa_K1653025]  by thin-layer chromatography (TLC)

Farnesol production device([http://parts.igem.org/wiki/index.php?title=Part:BBa_K1653025 BBa_K1653025])

IspA+MEP.dev.jpg
We submit new part(BBa_K165025) as producing FOH. FOH is probably generated through FPP hydrolysis by endogenous phosphatases, which are induced by an increased intracellular FPP level Analogously, we hypothesized that E. coli could produce FOH under cellular conditions of an increased intracellular FPP level through metabolic engineering. A MEP pathway has been shown to synthesize IPP and DMAPP efficiently in E. coli. Because of its high hydrophobicity and low volatility, decane was chosen to extract and solubilize FOH from culture broth. The decane overlay in the two-phase culture did not affect growth, and FOH could be solubilized in the decane phase with negligible volatile loss. We adopt 1 mL of decane overlaid to 5 mL of culture broth. Two-phase culture of E. coli JM109 (BBa_K165025) was carried out in 2YT medium containing 1% glycerol at 29°C for 48 h. The decane phase of the two-phase culture was collected to analyze the FOH content by GC-MS. In the GC-MS analysis (Fig. 4A-G), there was a main peak at 8.5 min in the collected decane phase sample, which corresponded to the reference solution of the standard FOH compound dissolved in decane. Mass spectrometry confirmed that the peak at 8.5 min was FOH (Fig. 4-A). However, the peak was not observed in two-phase culture without introducing BBa_K165025. The formation of FOH from FPP was further confirmed by blocking FPP synthesis. In the GC-MS, the FOH peak was observed in E. coli JM109 (BBa_K165025) culture, whereas no peak was observed with transformed E. coli JM109. It was found that FOH need not only ispA(BBa_K165018) but also MEP(BBa_K165024) in E. coli. We submit new part(BBa_K165025) as producing FOH.

Gas Chromatography/Mass(GC/MS)


NagahamaGC.jpg NagahamaGCMS.jpg

Fig4:The FOH standard solution (Ref) was used as a control. The peak corresponding to the FOH standard at 8.5 min is indicated by an arrow. The peak at 8.5 min was applied to GC/MS. The FOH standard solution (Ref) was used as a control. E. coli JM109(Bba_K165025) were compared with respect to FOH formation using GC-MS.

Geraniol production device

パーツ画像 GES.png

fig8:Questionnaire survey of fragrance of geraniol A:WT or recombinant(JM109/empty vector) B:recombinant(JM109/GES) Experimental cooperation persons:20 persons Experiment smelling the smell of A and B Experiment collaborators chose a stronger smell by comparing the A and B.
fig9:The results of the questionnaire survey WT was 20% of the total, and recombinant(JM109/GES) was 80% of the total, suggesting that recombinant(JM109/GES) was stronger smell than WT. p-value is assumed fifty‐fifty that normally can occur, and the difference compared to that assumption. In this result, p-value is less than 0.01. This probability is beyond the range that can occur by chance. This experiment indicate that recombinant(JM109/GES) might being synthesize geraniol.
fig10:The results of the questionnaire survey recombinant(JM109/Empty vector) was 50% of the total, and recombinant(JM109/GES) was 150% of the total, suggesting that recombinant(JM109/GES) was stronger smell than recombinant(JM109/Empty vector) . p-value is assumed fifty‐fifty that normally can occur, and the difference compared to that assumption. In this result, p-value is less than 0.05. This probability is beyond the range that can occur by chance. This experiment indicate that recombinant(JM109/GES) might being synthesize geraniol.

Gold

marA device ([http://parts.igem.org/wiki/index.php?title=Part:BBa_K1653020 Part:BBa_K1653020])

We have succeeded in improving the characterization of a previously existing BioBrick Part [http://parts.igem.org/Part:BBa_K1230000 BBa_K1230000]
MarA dev.png

We improved the characterization of a previously existing BioBrick Part [http://parts.igem.org/Part:BBa_K1230000 BBa_K1230000] In exsisting part's information of marA, it gives E. coli resistance against kanamycin only. In this year, we confilmed that overepressing of marA gives E. coli resistance against geraniol as one of the terpene and decrease its intracellular concentration. This information is very beneficial for other iGEMers to production of organic substance that have toxicity using bacteria.

Fig Colony formation efficiencies of E. coli JM109 overexpressing marA, on geraniol overlay plates.
E. coli JM109 and E. coli JM109 (marA) were spotted on LBGMg agar plates in serial ten-fold dilutions (10‐¹~10⁻⁵), overlaid with geraniol solutions, and incubated at 30°C for 24 h. This figure shows that E. coli JM109 (marA) that overxpresses marA is more surviving on geraniol overlay plates than E. coli JM109 (wild type).
Fig Comparison of colony number every 1 hour later in LBGMg medium overlayed by geraiol solution
A: E. coli JM109 (WT) + hexane B: E. coli JM109 (marA) +hexane C: E. coli JM109 (WT) + geraniol D: E. coli JM109 (marA) +geraniol
A and B increased almost the same on the plate. But C and D differed clealy. After 1 hour, C lost colony on the plate. In contrast, D could see colony all plates.
Fig Intracellular geraniol concentration of E. coli JM109 and its overexpressing of marA strain
The intracellular geraniol concentration of E. coli JM109(marA) was observed at 42.9 μg/ml, which was 40% lower than 72.2 μg/ml of E. coli JM109 (WT).

In our study, we confilmed that overexpressing of marA gives host E. coli high resistance against geraniol and reduce intracellular geraniol concentration.