从生物可用性稀缺到能源障碍:无氧微生物降解脱的局限性
Yi Ren1, Wenhao Deng2, Mike Manefield1
1Water Research Centre, School of Civil and Environmental Engineering, Sydney, NSW 2052, Australia. manefield@unsw.edu.au.
Physical chemistry chemical physics : PCCP
|February 13, 2026
概括
微生物对基和多基物质的还原性脱是由于其低生物利用率和高C-F键能量而受到限制的. 这些因素解释了这些持久污染物的缺乏有效的自然途径和工程应用.
科学领域:
- 环境微生物学环境微生物学
- 生物修复是一种生物修复.
- 计算化学是一种计算化学.
背景情况:
- 机体化物呼吸细菌及其减少性脱酶对于降解化污染物至关重要.
- 然而,这些酶在去除化per-和多醇基物质 (PFAS) 方面通常无效.
- 这种选择性的潜在物理化学原因尚不清楚.
研究的目的:
- 调查微生物还原性除器官的制约因素.
- 阐明减少性脱酶对PFAS无效的物理化学基础.
- 开发一个框架来评估有机的生物降解性.
主要方法:
- 量子化学和分子动力学模拟的整合.
- 对化乙烯的溶解自由能量的评估.
- 范德瓦尔斯能量的分析和降解脱酶的基质识别.
- 量子力学计算C-F键裂变能量屏障的量子力学计算.
主要成果:
- 由于不利的溶解自由能,有机具有较低的生物可用性,阻碍细胞吸收.
- 由于较弱的范德瓦尔斯相互作用与增加的化,减少脱基酶基质的识别受损.
- 降低C-F键裂变的能量屏障过高,阻止了脱化.
- 一个四化联体表现出偏好的稳定远离催化部位.
结论:
- 对脱路径的有限进化压力导致了PFAS缺乏强大的微生物脱机制.
- 包括低生物利用率,受损的酶基质相互作用和高C-F键能量在内的物理化学约束解释了PFAS有限的无氧微生物脱.
- 开发的计算工作流可以作为一个选工具,用于在工业使用之前预测新型有机的生物降解性.
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