Parts submitted to the Registry

For a brief overview of our main results, please have a look at our Main Results page.

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Favorite Tokyo_Tech 2013 iGEM Team Parts

Tokyo_Tech 2013 iGEM Team Parts

Best new BioBrick part (natural and engineered): BBa_K1139021

Fig. 5-1-1. Design of phage DNA for inducible phage release pSB3K3 backbone is required for maintenance of the DNA without inducer.

M13 is a filamentous phage that infects only F+ strains of E. coli, which does not kill the host cell. This biobrick is extracted from M13mp18 phage vector by PCR. It includes 11 ORFs, M13 origin, a packaging sequence and lac promoter. The promoter upstream of g2p (gene 2 protein) is altered to lux promoter. A phage particle is formed only when the host cell receives AHL signal (3OC6HSL, C6) because G2p (gene 2 protein) is an endonuclease needed for a plasmid to be replicated by M13 origin, and to be packaged into the phage particle. As a reporter, GFP is inserted downstream of the lac promoter.

Best new BioBrick part (natural): BBa_K1139020

We confirmed that M13 genome with two modifications related to our design kept plaque forming activity. One is replacement of the promoter for g2p protein with a constitutive promoter, PlacI^q (BBa_I14032). The other is accommodation of pSB3K3 backbone. Even though the plasmid has two different types of replication origins, M13 origin and pSB3 origin, this plasmid (BBa_K1139020, Fig. 5-1-2) formed plaque. In contrast, construction intermediates without a promoter for g2p coding sequence (Promoterless-M13 + Plac, Promoterless-M13 + Plac-GFP BBa_K1139022, Fig. 5-1-3) could not form plaque.

Fig. 5-1-2. PlacIq-M13-Plac-GFP on pSB3 (BBa_K1139020)

Fig. 5-1-3. Promoterless-M13-Plac-GFP on pSB3 (BBa_K1139022)

Best improved part and Best new BioBrick part (natural):

BBa_K1139201

We improved a phosphate sensor part since the existing phosphate sensor part (OUC-China 2012, BBa_K737024) did not have sufficient data. We constructed this part by amplifying the phoA promoter region of E. coli (MG1655) and ligating it upstream of GFP part. Compared to OUC-China’s phosphate sensor part including phoB promoter (Fig. 5-1-5), our phosphate sensor part shows clearer result (Fig. 5-1-4).

Sensor of phosphate concentration is valuable not only in synthetic biology about plants but also in other various sutdy of synthetic biology. Therefore, our improved part will be used frequently.

Fig. 5-1-4. Our phoA promoter assay result

Fig. 5-1-5. OUC-China 2012's phoB promoter assay result (converted to bar chart)

Fig. 5-1-6. The result of crosstalk circumvention

Best new BioBrick part (engineered): BBa_K1139110

We constructed BBa_K1139110 by combining Pcon-lasR (BBa_K553003) and Plux/tet-GFP (BBa_K934025). This is the first Biobrick part that succeeded in confirming circumvention of crosstalk of LasR to lux promoter. Using this part with plasmid that is constitutively expressing luxR and tetR, we succeeded in confirming circumvention of crosstalk LasR to lux promoter. To know more about crosstalk circumvention assay, please see here.

Best Part Collection

BBa_1139019, BBa_1139020, BBa_1139021

We have constructed a series of parts, BBa_1139019, BBa_1139020 and BBa_1139021. BBa_1139020 has a constitutive promoter upstream of BBa_1139019. BBa_1139021 has an inducible promoter upstream of BBa_1139019. These three parts are confirmed to work accurately in our circuits and are expected to enable DNA messaging. We would be able to transmit desired DNA to the desired place by using our parts.

Fig. 5-1-7. M13 family