来自Enterobacter cloacae的四模块化性多糖单氧酶的活性通过域间铜协调调节来调节
Koyel Bardhan1, Saumashish Mukherjee1, Theruvothu Madathil Vandhana1
1Department of Plant Sciences, School of Life Sciences, University of Hyderabad, Hyderabad, Telangana, India.
The Journal of biological chemistry
|November 22, 2025
概括
这项研究功能性地表征了Enterobacter cloacae lytic多糖胺单氧化酶 (EcLPMO),揭示了其基分裂活性和辅助域的关键作用. DUF-B 域独特地协调铜,可能在致病性环境中保护酶.
科学领域:
- 生物化学 生物化学
- 酶学 是一种酶学.
- 微生物学 微生物学
背景情况:
- 菌 (Enterobacter cloacae) 是一个重要的格兰氏阴性医院病原体.
- 基活性酶,包括性多糖体单氧化酶 (LPMOs),在各种生态中发挥作用.
- 了解LPMO结构功能关系对于病原体研究至关重要.
研究的目的:
- 为了从功能上描述来自Enterobacter cloacae (EcLPMO) 的LPMO.
- 阐明其不同域 (AA10,DUF-A,DUF-B,CBM73) 在酸盐降解中的作用.
- 调查新型铜协调的结构和功能意义.
主要方法:
- 生物化学分析使用全长和截断的 EcLPMO 变体.
- 对α-和β-胆的基降解活性测量.
- 与内源性酸酶进行协同活性分析.
- 使用AlphaFold3.3进行结构建模.
主要成果:
- 在ECLPMO的AA10域中,表现出C1位置的基裂变.
- 该CBM73模块增强了基结合和酶协同作用.
- 与EcChiA的协同作用显著增加了从基中释放的GlcNAc.
- 删除DUF域名减少了EcLPMO的活动,DUF-B发挥了独特的作用.
- AlphaFold3揭示了一个涉及DUF-B的新型四西丁铜协调中心.
结论:
- EcLPMO拥有复杂的模块化架构,有助于基降解.
- 辅助域,特别是DUF-B,对于酶稳定性和基质相互作用至关重要.
- DUF-B域的独特铜协调可能会保护LPMO活性部位,影响其在病原发生中的作用.
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