Poly(butylene adipate-co-terephthalate) biodegradation by Purpureocillium lilacinum strain BA1S.

Autor: Tseng WS; Institute of Biotechnology, National Taiwan University, R412, No. 81, Chang-Xing St, Taipei, 106, Taiwan., Lee MJ; Institute of Biotechnology, National Taiwan University, R412, No. 81, Chang-Xing St, Taipei, 106, Taiwan., Wu JA; Material and Chemical Research Laboratories, Industrial Technology Research Institute, 321 Kuang Fu Rd., Section 2, Hsinchu, Taiwan., Kuo SL; Material and Chemical Research Laboratories, Industrial Technology Research Institute, 321 Kuang Fu Rd., Section 2, Hsinchu, Taiwan., Chang SL; Material and Chemical Research Laboratories, Industrial Technology Research Institute, 321 Kuang Fu Rd., Section 2, Hsinchu, Taiwan., Huang SJ; Material and Chemical Research Laboratories, Industrial Technology Research Institute, 321 Kuang Fu Rd., Section 2, Hsinchu, Taiwan., Liu CT; Institute of Biotechnology, National Taiwan University, R412, No. 81, Chang-Xing St, Taipei, 106, Taiwan. chiteliu@ntu.edu.tw.; Department of Agricultural Chemistry, National Taiwan University No, 1, Sec. Roosevelt Road, Taipei, 106, Taiwan. chiteliu@ntu.edu.tw.; Agricultural Biotechnology Research Center, Academia Sinica, No.128, Sec.2, Academia Rd., Nankang, Taipei, 115, Taiwan. chiteliu@ntu.edu.tw.
Jazyk: angličtina
Zdroj: Applied microbiology and biotechnology [Appl Microbiol Biotechnol] 2023 Oct; Vol. 107 (19), pp. 6057-6070. Date of Electronic Publication: 2023 Aug 01.
DOI: 10.1007/s00253-023-12704-z
Abstrakt: Poly(butylene adipate-co-terephthalate) (PBAT), a promising biodegradable aliphatic-aromatic copolyester material, can be applied as an alternative material to reduce the adverse effects of conventional plastics. However, the degradation of PBAT plastics in soil is time-consuming, and effective PBAT-degrading microorganisms have rarely been reported. In this study, the biodegradation properties of PBAT by an elite fungal strain and related mechanisms were elucidated. Four PBAT-degrading fungal strains were isolated from farmland soils, and Purpureocillium lilacinum strain BA1S showed a prominent degradation rate. It decomposed approximately 15 wt.% of the PBAT films 30 days after inoculation. Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and Liquid chromatography mass spectrometry (LC‒MS) were conducted to analyze the physicochemical properties and composition of the byproducts after biodegradation. In the presence of PBAT, the lipolytic enzyme activities of BA1S were remarkably induced, and its cutinase gene was also significantly upregulated. Of note, the utilization of PBAT in BA1S cells was closely correlated with intracellular cytochrome P450 (CYP) monooxygenase. Furthermore, CreA-mediated carbon catabolite repression was confirmed to be involved in regulating PBAT-degrading hydrolases and affected the degradation efficiency. This study provides new insight into the degradation of PBAT by elite fungal strains and increases knowledge on the mechanism, which can be applied to control the biodegradability of PBAT films in the future. KEY POINTS: • Purpureocillium lilacinum strain BA1S was isolated from farmland soils and degraded PBAT plastic films at a prominent rate. • The lipolytic enzyme activities of strain BA1S were induced during coculture with PBAT, and the cutinase gene was significantly upregulated during PBAT degradation. • CreA-mediated carbon catabolite repression of BA1S plays an essential role in regulating the expression of PBAT-degrading hydrolases.
(© 2023. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)
Databáze: MEDLINE
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