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以EHEP为媒介的攻击棕藻对罗宁诱导的防御,以保护BGL活动的结构基础
Xiaomei Sun1, Yuxin Ye1, Naofumi Sakurai1
1Faculty of Advanced Life Science, Hokkaido University, Sapporo, Japan.
eLife
|November 1, 2023
概括
像Aplysia kurodai这样的海洋草食动物使用Eisenia水解增强蛋白 (EHEP) 来克服藻类的防御. EHEP保护消化酶β-葡萄糖酶 (akuBGL) 免受花素的抑制,从而使葡萄糖吸收.
科学领域:
- 海洋生态海洋生态学
- 生物化学 生物化学
- 结构生物学是结构生物学.
背景情况:
- 棕色藻类使用洛坦宁来防御食草动物.
- 海Aplysia kurodai用β-葡萄糖酶 (akuBGL) 和Eisenia增强水解蛋白 (EHEP) 来应对这种情况.
- EHEP可以保护akuBGL免受花素抑制.
研究的目的:
- 阐明藻类和Aplysia kurodai之间的消化-防御-攻击系统的分子机制.
- 为了确定EHEP和akuBGL的结构以及它们与花素的相互作用.
主要方法:
- 使用X射线晶体学来确定EHEP (apo和酸结合) 和akuBGL (apo) 的结构.
- 进行了结构比较和对接分析.
- 研究了罗宁沉物的pH依赖性溶解度.
主要成果:
- EHEP具有由三种氨酸-A域组成的三角结构,可以在没有发生重大构造变化的情况下与酸结合.
- 在性pH值下,EHEP促进了光的沉和稳定,适合消化.
- akuBGL有两个GH1域,只有一个包含活跃位点.
- 罗宁通过与其活性部位结合来抑制akuBGL,而EHEP通过隔离罗宁来防止这一点.
结论:
- 通过直接结合,EHEP可以保护akuBGL免受花素抑制.
- 结构上的洞察力揭示了一个复杂的分子策略,用于化学防御藻类的草食消化.
- 这个系统突出了海洋藻类和食草动物之间的共同进化军备竞赛.
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