| 主页 | 频道首页 | 本站地图 | 论坛留言 | 合作联系 | 本站消息 | |
科技动态 技术发展 文化研究 生物生态 人的研究 生命起源 基因工程 科学普及 科学探索 专题其他

科学家推出植物激素传导机制新理论

2008-08-01
科学家推出植物激素传导机制新理论
NEW THEORY ON PLANT HORMONES
英国《金融时报》艾伦•凯恩(Alan Cane)报道
2008年7月28日 星期一
类固醇经常出现在新闻中,因为希望长出大块肌肉的运动员会滥用类固醇;但这些激素对植物的生长和发育也十分关键。卡内基研究所(Carnegie Institution)的科学家就得出了激素如何发挥作用的新理论。

了解植物类固醇如何激活生长基因,可以带来植物产量的大丰收,对于激素如何在植物和动物细胞中发挥作用也能提供新的见解。

研究发表在上周的《科学》(Science)杂志上。类固醇在植物和动物细胞中的运动模式不同。在动物体内,受体分子位于细胞核内。在植物内部,类固醇——被称为油菜素类固醇(brassinosteroids)——则附着在细胞表面的受体上。

研究人员的难题是找出成长和发育的信号是如何从细胞外侧转递到细胞核内的基因的。他们知道蛋白质应该与之有关——但每个细胞中有上千个蛋白质,究竟是哪些在发挥作用呢?

一项名为蛋白质组学(proteomics)的生物技术提供了解答。这项技术使得研究人员能够辨认出细胞内所有的蛋白质,并且,通过分离出那些与细胞膜相关的蛋白质,他们得以确定一种叫做激酶(kinases)的蛋白质是最重要的化学信号传导体。

这项研究的负责人王志勇表示,这个发现填补了对激素活动认识的一项重要空白。

译者/管婧

阅读本文章英文,请点击 NEW THEORY ON PLANT HORMONES
NEW THEORY ON PLANT HORMONES
By Alan Cane
Monday, July 28, 2008
Steroids have been in the news because of their misuse by athletes looking to build big muscles; but these hormones are also vital for growth and development in plants, and scientists at the Carnegie Institution have a new theory for how they work.

Understanding how plant steroids turn on genes for growth could lead to more abundant harvests as well as new insights into how hormones operate in both plant and animal cells.

Their research is published in Sciencemagazine this week. Steroids have a different mode of action in plants and animals cells. In animals, there are receptor molecules within the cell nucleus. In plants, the steroids – called brassinosteroids – attach themselves to receptors on the cell surface.

The puzzle for researchers was to work out how the message to grow and prosper was transferred from the outside of the cell to the genes in the nucleus. They knew proteins would be involved – but which of the thousands in every cell?

A new biological technique called proteomics was the answer. It enabled researchers to identify all the proteins in the cell and, by separating off those associated with the cell membrane, they were able to identify proteins called kinases as the all-important chemical messengers.

Zhi-Yong Wang, who led the research, said the discovery filled a big gap in the understanding of hormone action.
本栏目下分类文章部分1

本栏目主要介绍生物学和生态学方面,包括生物技术、生物工程、生态经济、生态系统、生态环境、科学家推出植物激素传导机制新理论等。特别关注有关人与文化方面的研究。

『科学频道首页』 『本栏页首』 『关闭窗口』