一种绿色二染色蛋白质,使节肢动物能够模仿叶片
Nikita A Egorkin1,2, Anatoly M Aleksin1,2, Ilya A Sedlov1,2
1Laboratory of Protein-Protein Interactions, A.N. Bach Institute of Biochemistry, Federal Research Center of Biotechnology, Russian Academy of Sciences, Moscow 119071, Russia.
概括
研究人员在布什中发现了一种新型的绿色蛋白质 - - dibilinoxanthinin (DBXN),它是由比林和桑托菲尔组成的. 这一发现揭示了昆虫的伪装和生素在关节动物中的多功能作用.
科学领域:
- 生物化学 生化学
- 分子生物学分子生物学
- 结构生物学 结构生物学
背景情况:
- 一个多世纪以来,绿色昆虫伪装的分子基础基本上没有得到解释.
- 维特洛原蛋白是必要的,多功能型的甘油脂蛋白,参与胚胎发育,但缺乏详细的结构特征.
研究的目的:
- 为了隔离,识别和表征绿色水溶性蛋白质,负责布什的伪装 * Tettigonia cantans *.
- 阐明蛋白质独特光学特性及其在昆虫着色中的作用的结构和生化基础.
主要方法:
- 从 *Tettigonia cantans* 体中分离和净化绿色蛋白质.
- 蛋白质的de novo测序,克隆和高分辨率晶体结构的确定.
- 光谱分析以确定光吸收特性.
- 对其他绿色节肢动物的色素成分进行比较分析.
主要成果:
- 发现了一种新型的80kDa的二染色蛋白,名为双诺丁素 (DBXN).
- DBXN包括碎片化的维特洛金因与法恩基化比林和桑托菲尔结合,在不同的光谱区域吸收光,产生绿色色彩.
- 晶体结构显示出一个独特的折叠,其中有一个容纳比林,蛋白和酸胆的腔,赋予了特定的生物化学和光学特性.
- 在其他绿色关节动物中发现了类似的DBXN类蛋白质和更大的维特洛金蛋白质形式,具有类似的吸收,包括猎人蜘蛛*Micrommata virescens*.
结论:
- 维特洛金因可以通过新功能化作为关节动物绿色色素的基础.
- DBXN的组成和结构解释了在Tettigonia cantans中观察到的完美的树叶模仿.
- 不同的绿色节肢动物之间存在DBXN相关的色素机制的显著变异,突出了功能多样化潜力.
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