Difference between revisions of "Part:BBa K934001:Experience"

Revision as of 11:12, 25 September 2012

phaC1-A-B1 [P(3HB) synthesis]

To synthesize PHB by E.coli, we transformed E.coli JM109 with the constructed phaC1-A-B1 parts on pSB1C3 (BBa_K934001). E.coli JM109 is used to synthesize PHB, because it tends to have a high density accumulation of PHB. As a negative control, we transformed E.coli JM109 with PlasI-gfp on pSB1C3.

FIG1 is the photographs of E.coli colonies on Nile red positive medium taken under UV. The orange colonies in FIG1.A show that the accumulated poly-3-hydroxybutyrate, PHB in cells was stained by Nile red. This result indicates that part BBa_K934001 synthesized PHB. FIG1.B is the photograph of negative control cells. In this figure we observed that there were no remarkable colored colonies. we cultured the transformant on LB agar medium plates with 0.5μg/ml Nile Red and 2% glucose at 37℃ for 30 hours, then we transferred the plates to 4℃ room. After 115 hours, colonies with PHB would be stained Red by Nile red when observed under UV.

FIG1.A: E.coli JM109 colonies with BBa_K934001 gene, PHB accumulation. FIG1.B: E.coli JM109 colonies with PlasI-gfp gene, no PHB accumulation.

FIG2 shows the difference between cells storing PHB and those not storing PHB. The cells in blue rectangle area are the cells with PHB synthesis gene and the cells in green rectangle area are the cells with plasI-gfp gene as a negative control. We cultured the colony in LB solution for 16hrs at 37℃, then we concentrated the solution and

FIG2 Difference between cells storing PHB and cells not storing PHB. Blue rectangle: with BBa_K934001 gene, PHB accumulationGreen rectangle: with PlasI-gfp gene, no PHB accumulation.

Using the cells storing PHB, we drew a rose silhouette on the LB agar plate containing Nile red. (FIG3).

FIG.3 Rose silhouette on the LB agar plate containing Nile red.

FIG4.A is the photograph of dried E.coli (with phaC1-A-B1 gene) cells dyed with Nile blue A solution taken by fluorescence microscope. The fluorescent areas in FIG4.a are the accumulated PHB in the cells was. This result also indicates that part BBa_K934001 synthesized PHB. In the photograph of negative control (FIG4.B), no remarkable fluorescent area was observed.

FIG4.A E.coli JM109 cells with PHB accumulation).FIG4.B E.coli JM109 cells without PHB accumulation).

For more information, see [http://2012.igem.org/Team:Tokyo_Tech/Projects/PHAs/index.htm#3. our work in Tokyo_Tech 2012 wiki].

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