[논문]Characterization and engineering of a plastic-degrading aromatic polyesterase

Austin, Harry P.; Allen, Mark D.; Donohoe, Bryon S.; Rorrer, Nicholas A.; Kearns, Fiona L.; Silveira, Rodrigo L.; Pollard, Benjamin C.; Dominick, Graham; Duman, Ramona; El Omari, Kamel; Mykhaylyk, Vitaliy; Wagner, Armin; Michener, William E.; Amore, Antonella; Skaf, Munir S.; Crowley, Michael F.; Thorne, Alan W.; Johnson, Christopher W.; Woodcock, H. Lee; McGeehan, John E.; Beckham, Gregg T.

doi:10.1073/pnas.1718804115

[해외논문] Characterization and engineering of a plastic-degrading aromatic polyesterase 원문보기

Proceedings of the National Academy of Sciences of the United States of America, v.115 no.19, 2018년, pp.E4350 - E4357

Austin, Harry P. (University of Portsmouth) , Allen, Mark D. (University of Portsmouth) , Donohoe, Bryon S. (National Renewable Energy Laboratory) , Rorrer, Nicholas A. (National Renewable Energy Laboratory) , Kearns, Fiona L. (University of South Florida) , Silveira, Rodrigo L. (National Renewable Energy Laboratory) , Pollard, Benjamin C. (University of South Florida) , Dominick, Graham (National Renewable Energy Laboratory) , Duman, Ramona (Diamond Light Source) , El Omari, Kamel (Diamond Light Source) , Mykhaylyk, Vitaliy (Diamond Light Source) , Wagner, Armin (Diamond Light Source) , Michener, William E. (National Renewable Energy Laboratory) , Amore, Antonella (National Renewable Energy Laboratory) , Skaf, Munir S. (University of Campinas) , Crowley, Michael F. (National Renewable Energy Laboratory) , Thorne, Alan W. (University of Portsmouth) , Johnson, Christopher W. (National Renewable Energy Laboratory) , Woodcock, H. Lee (University of South Florida) , McGeehan, John E. (University of Portsmouth) , Beckham, Gregg T. (National Renewable Energy Laboratory)

Abstract ▼ AI-Helper

SignificanceSynthetic polymers are ubiquitous in the modern world but pose a global environmental problem. While plastics such as poly(ethylene terephthalate) (PET) are highly versatile, their resistance to natural degradation presents a serious, growing risk to fauna and flora, particularly in marine environments. Here, we have characterized the 3D structure of a newly discovered enzyme that can digest highly crystalline PET, the primary material used in the manufacture of single-use plastic beverage bottles, in some clothing, and in carpets. We engineer this enzyme for improved PET degradation capacity and further demonstrate that it can also degrade an important PET replacement, polyethylene-2,5-furandicarboxylate, providing new opportunities for biobased plastics recycling.Poly(ethylene terephthalate) (PET) is one of the most abundantly produced synthetic polymers and is accumulating in the environment at a staggering rate as discarded packaging and textiles. The properties that make PET so useful also endow it with an alarming resistance to biodegradation, likely lasting centuries in the environment. Our collective reliance on PET and other plastics means that this buildup will continue unless solutions are found. Recently, a newly discovered bacterium, Ideonella sakaiensis 201-F6, was shown to exhibit the rare ability to grow on PET as a major carbon and energy source. Central to its PET biodegradation capability is a secreted PETase (PET-digesting enzyme). Here, we present a 0.92 Å resolution X-ray crystal structure of PETase, which reveals features common to both cutinases and lipases. PETase retains the ancestral α/β-hydrolase fold but exhibits a more open active-site cleft than homologous cutinases. By narrowing the binding cleft via mutation of two active-site residues to conserved amino acids in cutinases, we surprisingly observe improved PET degradation, suggesting that PETase is not fully optimized for crystalline PET degradation, despite presumably evolving in a PET-rich environment. Additionally, we show that PETase degrades another semiaromatic polyester, polyethylene-2,5-furandicarboxylate (PEF), which is an emerging, bioderived PET replacement with improved barrier properties. In contrast, PETase does not degrade aliphatic polyesters, suggesting that it is generally an aromatic polyesterase. These findings suggest that additional protein engineering to increase PETase performance is realistic and highlight the need for further developments of structure/activity relationships for biodegradation of synthetic polyesters.

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참고문헌 (63)

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[해외논문] Characterization and engineering of a plastic-degrading aromatic polyesterase 원문보기

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