Wagner-Egea, P.; Aristizábal-Lanza, L.; Tullberg, C.; Wang, P.; Bernfur, K.; Grey, C.; Zhang, B.; Linares-Pastén, J.A. Marine PET Hydrolase (PET2): Assessment of Terephthalate- and Indole-Based Polyester Depolymerization. Catalysts2023, 13, 1234.
Wagner-Egea, P.; Aristizábal-Lanza, L.; Tullberg, C.; Wang, P.; Bernfur, K.; Grey, C.; Zhang, B.; Linares-Pastén, J.A. Marine PET Hydrolase (PET2): Assessment of Terephthalate- and Indole-Based Polyester Depolymerization. Catalysts 2023, 13, 1234.
Wagner-Egea, P.; Aristizábal-Lanza, L.; Tullberg, C.; Wang, P.; Bernfur, K.; Grey, C.; Zhang, B.; Linares-Pastén, J.A. Marine PET Hydrolase (PET2): Assessment of Terephthalate- and Indole-Based Polyester Depolymerization. Catalysts2023, 13, 1234.
Wagner-Egea, P.; Aristizábal-Lanza, L.; Tullberg, C.; Wang, P.; Bernfur, K.; Grey, C.; Zhang, B.; Linares-Pastén, J.A. Marine PET Hydrolase (PET2): Assessment of Terephthalate- and Indole-Based Polyester Depolymerization. Catalysts 2023, 13, 1234.
Abstract
Enzymatic polyethylene terephthalate (PET) recycling processes are gaining interest for their low environmental impact, use of mild conditions, and specificity. Furthermore, PET hydrolase enzymes are continuously being discovered and engineered. In this work, we studied a PET hydrolase (PET2), initially characterized as an alkaline thermostable lipase. PET2 was produced in a fusion form with a 6-histidine tag in the N-terminal. The PET2 activity on aromatic terephthalate and new indole-based polyesters was evaluated using polymers in powder form. Compared with IsPETase, an enzyme derived from Ideonella sakaiensis, PET2 showed a lower PET depolymerization yield. However, interestingly, PET2 gave significantly higher polybutylene terephthalate (PBT) and polyhexylene terephthalate (PHT) depolymerization yields. A clear preference was found for aromatic indole-derived polyesters over non-aromatic ones. No activity was detected on Akestra™, an amorphous copolyester with spiroacetal structures. Docking studies suggest that a narrower and more hydrophobic active site reduces its activity on PET but favours its interaction with PBT and PHT. Understanding the enzyme preferences of polymers will contribute to their effective use to depolymerize different types of polyesters.
Biology and Life Sciences, Biology and Biotechnology
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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