Team:Tokyo Tech/Projects/PHAs/detail/index.htm


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PHA production detail

Materials & Methods

Construction of pha-C1-A-B1 in Biobrick format

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fig3,construction of phaC1-A-B1

To construct a part that meets Biobrick format, we have modified the phaC1-A-B1 operon not to contain forbidden restriction enzyme sites. First, we cloned the wild type gene phaC1-A-B1 from R.eutropha H16 by using PCR and inserted the gene into pSB1C3. However, wild type phaC1-A-B1 gene sequence contains one NotI and three PstI recognition sites that are not allowed in Biobrick format. To get phaC1-A-B1 sequence without these recognition sites, we ordered the chemically synthesized DNA from IDT/MBL. In this chemically synthesized DNA, coding is optimized for E.coli. We used restriction enzyme XbaI (on pSB1C3) and BsrGI (on phaC1-A-B1) to insert sequence. That is to say, we got Poly[(R)-3-hydroxybutyrate] synthesizing gene in Biobrick format (BBa_K934001). Fig3:construction of phaC1-A-B1

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Production trial of PHAs by past teams

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We introduce some attempts in the past iGEM to show how great our work is in iGEM.


Part number Description States experience
BBa_K338003PHA Synthase Composite, Part 1/2Planning
BBa_K338004PHA Synthase Composite, Part 1/2AvailableNone

They couldn’t prove that their engineered bacteria produced PHB according to the team wiki.


Part number Description States experience
BBa_K342001Pha C (poly-β-hydroxybutyrate polymerase)AvailableNone

They registered and submitted a part, which contains only phaC sequence, as worked. But the team wiki shows that the part doesn’t meet the standard which is required in iGEM because they couldn’t cut their part with Xba1.


Part number Description States experience

iGEM08_Utah State

Part number Description States experience
BBa_K089001phaA genePlanning
BBa_K089002phaB genePlanning
BBa_K089003phaC genePlanning


Part number Description States experience
BBa_K125802 RBS-phaBPlanning
BBa_K125501phaA BioPlastic polyhydroxybutyrate synthesis pathway (origin PCC6803 slr1994)AvailableNone
BBa_K125502phaB BioPlastic polyhydroxybutyrate synthesis pathway (origin PCC6803 slr1994)AvailableNone
BBa_K125503phaC BioPlastic polyhydroxybutyrate synthesis pathway (origin PCC6803 slr1994)AvailableNone
BBa_K125504phaE BioPlastic polyhydroxybutyrate synthesis pathway (origin PCC6803 slr1994)AvailableNone


Part number Description States experience
BBa_K156031RBS + phaA + double terminatorAvailableNone
BBa_K156033RBS + phaB1 + double terminatorAvailableNone
BBa_K156034RBS + phaC1 + double terminatorAvailableNone
BBa_K156012 phaA (acetyl-CoA acetyltransferase)AvailableNone
BBa_K156013phaB1 (acetyacetyl-CoA reductase)AvailableNone
BBa_K156014phaC1 (Poly(3-hydroxybutyrate) polymerase)AvailableNone
BBa_K156021Promoter + RBS + phaA + double terminatorAvailableNone
BBa_K156018Promoter + RBS + phaAPlanning
BBa_K156019Promoter + RBS + phaB1Planning
BBa_K156020Promoter + RBS + phaC1Planning
BBa_K156022 Promoter + RBS + phaB1 + double terminatorPlanning
BBa_K156023Promoter + RBS + phaC1 + double terminatorPlanning

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A .PHB production on colonies and preparation before confirmation with Nile red under UV

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1 Preparation of LB agar medium plate containing Nile red and Glucose

1.1 Autoclave a LB agar(final 40g/L) solution at 120 ° C

1.2 After the autoclave, add Chloramphenicol(final 25ug/ml), Nile red and glucose(final 20g/L) to the solution when it cools down.

1.3 Make LB agar medium plates with the mixture.

2 Transformation of pSB1C1 plasmid with phaC1-A-B1 into strain JM109

2.1 Thaw the competent cells JM109 at 4° C

2.2 Add the target DNA 3ul into 1.5ml tube, then add in 50ul the thawed competent cells.

2.3 Put the tube into ice for 15mins

2.4 42° C,30secs, heatshock

2.5 Add 160ul into the tube

2.6 Culture the transformant at 37° C for 30mins

2.7 Paint the transformant on LB agar medium with a large cone rod.

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B.PHB production in cells and preparation before the confirmation with Nile blue A

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1 Production of PHB

1.1 Acquire one colony of the transformed strains (JM109) with a platinum loop

1.2 Culture the colony in LB solution for 16hrs at 37 ° C

1.3 Measure LB medium (final 4%) and add it to each Erlenmeyer flask inside clean bench.

1.4 Add distilled water(final 95%) to each Erlenmeyer flask and cover the flasks with four-folded aluminum foil.

1.5 Set all flasks into autoclave

1.6 Add 1/1000 Chloramphenicol(final 25ug/ml) and glucose solution (50%) (final 20g/L) after the medium is completely cooled.

1.7 Add the solution of cultured cells into each flasks and shaking culture at 37 ° C for 96 hours.

Fig2. air permeable lids

2 Preparation before the confirmation (with Nile blue A) under fluorescent microscope

2.1 Collection of PHBs in JM109

2.1.1 Weigh empty 50ml falcon tube without lid and make a record.

2.1.2 Add some culture solution into each tube.

2.1.3 Set the tubes into centrifuge and make sure that the label faces outside.

2.1.4 4 ° C, 5000G, 10mins in centrifuge.

2.1.5 Remove the supernatant with electric pipettor then add culture solution and set in centrifuge again.

2.1.6 After adding all the culture solution and setting in centrifuge, remove the supernatant and add water, set in centrifuge again.

2.1.7 Remove the supernatant and add a little amount of water

2.1.8 Cover the tubes with double layers of parafilms and fully freeze them.

2.2 Freeze drying (lyophilization)

2.2.1 Poke several holes on the tubes’ parafilm with toothpick.

2.2.2 Set the tubes on the freeze drying machine.

2.2.3 Freeze dry for 3 days.

2.3 Stain PHB accumulated dried cells with Nile blue A before observation

2.3.1 Acquire dried cells after freeze drying

2.3.2 Put a small amount of cells on the slide glass

2.3.3 Add water on the cells and heat the slide glass immobilize the cells

2.3.4 Stain the cells with 1% Nile blue A solution (water) for 8 minutes

2.3.5 Wash excess Nile blue A with 8% acetic acid solution

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