碳水化合物结合模块通过促进性多糖胺单氧化酶活性部位 H2O2消费增加 H2O2 耐受性
Wa Gao1, Tang Li2, Haichuan Zhou2
1Dalian Engineering Research Center for Carbohydrate Agricultural Preparations, Dalian Technology Innovation Center for Green Agriculture, Liaoning Provincial Key Laboratory of Carbohydrates, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China; University of Chinese Academy of Sciences, Beijing, China.
碳水化合物结合模块 (CBMs) 增强了性多糖胺单氧化酶 (LPMO) 活性和过氧化 (H2O2) 耐受性. CBM融合改善了基质结合,酶效率,并减少了酶损伤.
科学领域:
- 生物化学 生物化学
- 酶学 是一种酶学.
- 生物技术是生物技术.
背景情况:
- 在生物质转化过程中,性多糖单氧酶 (LPMOs) 对于分解复杂的碳水化合物至关重要.
- 碳水化合物结合模块 (CBM) 在LPMO的催化功能和稳定性中的作用仍然在很大程度上未被描述.
研究的目的:
- 调查CBM对LPMO活性和过氧化 (H2O2) 耐受性的影响.
- 阐明CBM影响LPMO业绩的机制.
主要方法:
- 使用了Myceliophthora thermophila LPMOs (MtLPMO9L和MtLPMO9G) 的截断和CBM融合的变种.
- 评估了基质结合亲和力,酶活性和H2O2耐受性.
- 采用分子动力学模拟来分析活性部位的近距离和H2O2暴露.
主要成果:
- 从MtLPMO9G中去除CBM减少了基质的结合和活性.
- CBM与MtLPMO9L的融合显著增强了基质结合,酶活性和H2O2耐受性.
- CBM融合促进了多局部裂变,优化了活性部位与基质的接近,并减少了铜活性中心的自氧化损伤.
结论:
- 在提高LPMO的催化效率和稳定性方面,CBM起着至关重要的作用.
- 在工业应用中,CBM融合是改善LPMO性能的一个有前途的策略.
- 优化H2O2消耗和减少酶自我损伤有助于CBMs的有益作用.
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