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一个与ependymin相关的蓝色胡卜素蛋白装饰了海洋蓝色海绵
Shinji Kawasaki1, Takayuki Kaneko1, Tomomi Asano1
1Department of Molecular Microbiology, Tokyo University of Agriculture, Tokyo, Japan.
The Journal of biological chemistry
|July 30, 2023
概括
研究人员在海洋海绵中发现了一种新型的蓝色胡卜素蛋白,与鱼类内膜蛋白 (EPD) 有关. 这种蛋白质结合了两种不同的胡卜素,通过低颜色转移创造了海绵的蓝色.
科学领域:
- 海洋生物学 海洋生物学
- 生物化学 生物化学
- 结构生物学是结构生物学.
背景情况:
- 海洋动物表现出多样化的色彩,但分子机制尚未完全理解.
- 甲类动物的蓝色染色涉及甲素转移阿斯塔克桑的颜色,但其他海洋类的类似机制较少被探索.
研究的目的:
- 为了识别和表征蓝色胡卜素蛋白,负责海蓝海绵 Haliclona sp. 的颜色.
- 为了阐明这种海绵中蓝色颜色形成的结构和功能基础.
主要方法:
- 蓝色胡卜素蛋白的净化和表征.
- 纯化蛋白质的晶体结构分析.
- 复制试验用于研究胡卜素结合和光谱转移.
主要成果:
- 在Haliclona sp.中发现了一种与ependymin (EPD) 相关的水溶性蓝色胡卜素-1蛋白.
- 这种蛋白质是一种异构体,它结合了两个色的胡卜素,阿斯塔桑丁 (AXT) 和米提洛桑丁,从而导致巴托克罗米色转变为蓝色.
- 晶体结构揭示了与异构体接口结合的胡卜素,具有平行聚烯链对齐,尽管与类素的进化分歧.
结论:
- 基底甲动物中的一个表胺 (EPD) 作为蓝色胡卜素蛋白.
- 这种EPD在其异构体接口上结合结构上无关的胡卜素 (AXT和mytiloxanthin),在海绵中产生蓝色色彩.
- 这些发现揭示了在海洋无脊椎动物中产生蓝色颜色的新机制.
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