Difference between revisions of "Team:Harvard BioDesign"
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Revision as of 21:24, 13 October 2016
Plastiback
The Harvard iGEM team began our brainstorming sessions during the late spring. We had a massive brainstorming session where we generated topics to investigate, and in the following weeks, scoured the internet for previous research relating to these topics. We met a few more times to discuss what we had found. After narrowing our search down to 4 projects, we wrote mini proposals to present each idea to the rest of the team. At the beginning of the summer, we continued our project planning with one project: Breaking PET.
In Breaking PET, we hope to engineer a biological system that breaks down PET, a molecule which makes up one sixth of plastic products. Our project is grounded in research done by the Oda group at Kyoto Institute of Technology. In the paper “A bacteria that degrades and assimilates poly(ethylene terephthalate)”, they describe a bacteria found at a bottle recycling plant that has the ability to metabolize PET. From this paper, we found enzyme sequences for the two enzymes thought responsible for PET degradation: PETase and MHETase. PETase breaks down PET into the compound MHET, or mono(2-hydroxylethyl)terephthalic acid. MHETase further breaks down MHET into terephthalic acid and ethylene glycol. The discovery of these two enzymes is exciting because, unlike other PET degrading enzymes, PETase and MHETase are dedicated to the role of PET degradation. Additionally, PETase has been shown to have a degrading efficiency 120 times greater than alternative enzymes.
Our project aims to use E Coli transformed with PETase and MHETase to break down PET and generate electricity. We will create BioBricks for PETase and MHETase and characterize these parts against enzymes used in previous PET degrading iGEM projects. Additionally, we hope to engineer a secretion system for these enzymes. We will also attempt to make a bioreactor/microbial fuel cell to generate electricity from the products of the PET degradation process.
