评论：塑料结合模块促进聚对苯二甲酸乙二醇酯的酶法降解

Commentary: polymer binding modules accelerate enzymatic degradation of poly(ethylene terephthalate)

摘要:

塑料的大量生产和无节制的使用已造成严重的环境污染。为了减少塑料废物对环境的影响，近年来塑料酶法降解已成为国内外研究者关注的热点。例如，通过蛋白质工程策略提高塑料降解酶催化活性和热稳定性，进一步提高酶法降解的效率。另外，通过融合酶策略将塑料结合模块与塑料降解酶融合，也可以促进塑料降解。近期发表在期刊Chem Catalysis的一项研究表明，采用碳水化合物结合模块融合策略可以在低浓度(<10 wt%)的底物聚对苯二甲酸乙二醇酯[poly(ethylene terephthalate), PET]中提高塑料降解酶的活性。但是在高浓度底物(10 wt%-20 wt%)中，该策略无法提高PET的酶法降解。该项研究对于采用塑料结合模块促进酶法降解塑料具有重要的指导意义。

Abstract:

The large scale production and indiscriminate use of plastics led to serious environmental pollution. To reduce the negative effects of plastics waste on the environment, an approach of enzymatic degradation was put forward to catalyze plastics degradation. Protein engineering strategies have been applied to improve the plastics degrading enzyme properties such as activity and thermal stability. In addition, polymer binding modules were found to accelerate the enzymatic degradation of plastics. In this article, we introduced a recent work published in Chem Catalysis, which studied the role of binding modules in enzymatic hydrolysis of poly(ethylene terephthalate) (PET) at high-solids loadings. Graham et al. found that binding modules accelerated PET enzymatic degradation at low PET loading (<10 wt%) and the enhanced degradation cannot be observed at high PET loading (10 wt%-20 wt%). This work is beneficial for the industrial application of polymer binding modules in plastics degradation.