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碳水化合物结合模块对性多糖胺单氧化酶如何改变纤维素纤维的影响

Fredrik G Støpamo¹, Irina Sulaeva², David Budischowsky²

¹Norwegian University of Life Sciences (NMBU), Ås, Norway.

Biotechnology for biofuels and bioproducts

|August 24, 2024

概括

酸多糖单氧酶 (LPMOs) 中的碳水化合物结合模块 (CBM) 影响这些酶如何修改纤维素纤维. 带有CBM的LPMO更好地结合并修改纤维素表面,而没有CBM的LPMO则更深入地透以修改核心.

科学领域:

生物化学和生物技术
材料科学与工程材料科学与工程

背景情况:

性多糖化单氧化酶 (LPMOs) 是依赖铜的氧化还原酶,对于氧化纤维素裂变和纤维修饰至关重要.
LPMOs可以存在于单域蛋白质或具有附加的碳水化合物结合模块 (CBM),从而影响基质相互作用.
在LPMO介导的纤维素改性中CBM的确切作用,特别是它们对酶作用的三维分布的影响,需要进一步阐明.

研究的目的:

研究碳水化合物结合模块 (CBM) 对来自Neurospora crassa的AA9LPMO,NcAA9C家族纤维修饰性能的影响.
阐明CBM的存在或不存在如何影响LPMO结合,纤维素降解和纤维素纤维纤维内的氧化位点的空间分布.

主要方法:

采用生物化学测试来研究LPMO活性和基质结合.
利用新开发的多步纤维溶解方法,从纤维表面到核心映射LPMO作用.
将全长NcAA9C (带CBM) 与一个截断的,没有CBM的变种进行了比较.

主要成果:

CBM显著增强了NcAA9C与各种形式的纤维素 (无形,天然,处理) 的结合.
没有CBM的NcAA9C表现出效率降低和自催化降解增加,但显示出更深的透和更多的核心氧化.
序列溶解显示,含CBM的LPMOs将氧化局部化到纤维表面,而无CBM的LPMOs则在整个纤维核心中更均地分配修改.

结论:

性多糖化单氧化酶 (LPMOs) 可以从表面到核心修改纤维素纤维,CBM在确定这种分布中发挥着关键作用.
酶模块化,特别是CBM的存在或不存在,提供了一种策略,以设计具有定制性质的纤维素基材料.
这些发现强调CBM是LPMO处理的纤维素纤维的三维氧化模式的关键决定因素.

关键词:

AA9 低质量管理者这是CBM CBM.碳烯检测检测器可以检测碳烯.纤维素是纤维素的一种.酵素纤维工程酵素纤维工程光是一种光效应.功能变化的功能变化.氧化过程中的氧化.尺寸排除色谱学尺寸排除色谱学

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