聚烯氧化酶产品是LPMO氧化酶活动的原始剂
Caio de Oliveira Gorgulho Silva1, Marlene Vuillemin1, Mirjam A Kabel2
1Department of Biotechnology and Biomedicine, Technical University of Denmark, Søltofts Plads 221, 2800, Kgs Lyngby, Denmark.
ChemSusChem
|June 6, 2023
概括
聚氧化素通过提供初始电子而不是不断地为它们提供燃料来氧化主要的酸性多糖体单氧化酶 (LPMOs). 这项研究阐明了多氧化酶产品在LPMO细胞分解活性中的独特作用.
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:
- 聚烯氧化酶 (PPO) 氧化单到二醇,作为性多糖单氧化酶 (LPMOs) 的降解剂.
- LPMOs对于纤维素降解至关重要,在它们的催化循环中使用降解剂.
- 了解PPO产品在LPMO活动中的特定作用对于优化酶性纤维素分解至关重要.
研究的目的:
- 为了区分多氧化酶 (MtPPO7) 催化产品在化聚糖胺单氧化酶 (LPMO) 活动的原始和燃料中的作用.
- 调查MtPPO7产品对降低Cu (II) 到Cu (I) 和持续LPMO催化作用的贡献.
- 评估MtPPO7产品在现场生成的H2O2及其对LPMO过氧酶活性的影响.
主要方法:
- 使用来自Myceliophthora thermophila的多氧化酶MtPPO7和来自Neurospora crassa的性多糖胺单氧化酶NcAA9C进行酶分析.
- 对瓜亚科尔及其催化产品的MtPPO7活动的特征.
- 在LPMO活动的背景下,对MtPPO7产品的减速功率和H2O2产生进行分析.
主要成果:
- MtPPO7催化产品启动了Cu (II) 到Cu (I) 的降解,这对于LPMO活动 (原始化) 是必不可少的.
- 这些产品缺乏连续LPMO加油所需的持续减速功率.
- MtPPO7产品的最小的 in situ H2O2生成可以防止LPMO过氧酶活性显著增加.
结论:
- 多氧化酶产物主要作为LPMOs的初始电子捐赠者 (原始剂),而不是持续的燃料来源.
- 当使用低H2O2倾向的降解剂时,通过外源H2O2控制LPMO催化是可行的,从而最大限度地减少酶失活.
- 这项研究通过了解PPO和LPMO之间的相互作用,为优化酶性纤维素降解提供了洞察力.
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