Ming Yan Purification and Reengineering of Plastic- Degrading Enzymes
Plastic bags are made from polyethylene (PE), a polymer consisting of long chains of the ethylene monomer (C 2 H 4 ). Species of bacteria belonging to the Streptomyces genus are capable of producing polyethylene- degrading enzymes.
Streptomyces
Streptomyces viridosporus Streptomyces badius Streptomyces setonii
How is Biodegradability Measured? Weight loss Tensile strength loss measured stress at fracture of the specimen Changes in percent elongation extension of material under load Changes in polyethylene molecular weight distribution polydispersity
Project Ideas Aim 1: To purify and characterize the biodegradable polyethylene-degrading enzyme(s) from bacterium belonging to the Streptomyces species Aim 2: To enhance the biodegradability of the polyethylene by increasing the efficiency of the degrading enzymes through protein engineering techniques
Aim 1 Inspiration Enzymes identified for anaerobic degradation of polyethylene glycol (PEG) Technical Difficulties with the isolation methods
Aim 2 To enhance the biodegradability of the polyethylene by increasing the efficiency of the degrading enzymes through protein engineering techniques Methods: Score system Protein engineering
Protein-Engineering
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