An Esterase from Anaerobic Clostridium hathewayi Can Hydrolyze Aliphatic–Aromatic Polyesters
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- 作者：Veronika Perz ; Altijana Hromic ; Armin Baumschlager ; Georg Steinkellner ; Tea Pavkov-Keller ; Karl Gruber ; Klaus Bleymaier ; Sabine Zitzenbacher ; Armin Zankel ; Claudia Mayrhofer ; Carsten Sinkel ; Ulf Kueper ; Katharina Schlegel ; Doris Ribitsch ; Georg M. Guebitz
- 刊名：Environmental Science & Technology
- 出版年：2016
- 出版时间：March 15, 2016
- 年：2016
- 卷：50
- 期：6
- 页码：2899-2907
- 全文大小：452K
- ISSN：1520-5851
文摘
Recently, a variety of biodegradable polymers have been developed as alternatives to recalcitrant materials. Although many studies on polyester biodegradability have focused on aerobic environments, there is much less known on biodegradation of polyesters in natural and artificial anaerobic habitats. Consequently, the potential of anaerobic biogas sludge to hydrolyze the synthetic compostable polyester PBAT (poly(butylene adipate-co-butylene terephthalate) was evaluated in this study. On the basis of reverse-phase high-performance liquid chromatography (RP-HPLC) analysis, accumulation of terephthalic acid (Ta) was observed in all anaerobic batches within the first 14 days. Thereafter, a decline of Ta was observed, which occurred presumably due to consumption by the microbial population. The esterase Chath_Est1 from the anaerobic risk 1 strain Clostridium hathewayi DSM-13479 was found to hydrolyze PBAT. Detailed characterization of this esterase including elucidation of the crystal structure was performed. The crystal structure indicates that Chath_Est1 belongs to the α/β-hydrolases family. This study gives a clear hint that also micro-organisms in anaerobic habitats can degrade manmade PBAT.