绿色血统中的细胞染色体b5多样性先于syringyl lignin生物合成的进化
Xianhai Zhao1, Yunjun Zhao1, Qing-Yin Zeng2
1Biology Department, Brookhaven National Laboratory, Upton, NY 11973, USA.
The Plant cell
|April 24, 2024
概括
古代的细胞染色体b5蛋白CB5D使得陆地植物中的syringyl (S) - lignin生物合成成为可能. 血管精子化物5-基酶 (F5H) 选择了这个古老的CB5D,恢复了S-线素的产生.
科学领域:
- 植物进化生物学 植物进化生物学
- 生物化学 生物化学
- 分子进化的分子进化.
背景情况:
- 氨酸 (S) - 氨酸生物合成对于血管植物的进化至关重要.
- 化5-基酶 (F5H) 调解了血管精子中的S-线素的产生,需要细胞染色体b5蛋白CB5D.
- F5H和CB5D的进化起源和共同进化仍然不清楚.
研究的目的:
- 研究S-线素生物合成中的CB5D型功能和F5H的古代起源和共同进化.
- 了解CB5D功能在陆地植物中的分子基础.
主要方法:
- 对跨植物系的CB5D进化进行了植物遗传学分析.
- 序列动机分析以确定CB5D中的关键功能残留物.
- 在不同植物群体中对S-素生物合成途径的比较分析.
主要成果:
- CB5D类型的功能起源于藻类,在陆地植物中保存,特别是芽植物.
- 在CB5D的Helix 5中,一种特定的酸性氨基酸基因对其在陆地植物中的功能至关重要.
- 百合植物 Selaginella 使用一个独立进化的 F5H (CYP788A1) 与不同的氧化还原合作伙伴,缺乏 CB5D 类型的功能.
- 血管精子F5Hs利用古老的CB5D,形成一个新的P450系统用于S-线素合成.
结论:
- 血管精子S-线素生物合成依赖于古老的CB5D蛋白质,用于现代P450系统.
- CB5D的演变早于地球化,功能多样化发生在早期.
- S-线素通路的独立进化突出了植物进化的多样化策略.
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