碳酸无水酶,EPF2和一种新型蛋白酶介导CO2控制口腔发育的过程
Cawas B Engineer1, Majid Ghassemian2, Jeffrey C Anderson3
1Division of Biological Sciences, University of California San Diego, La Jolla, California 92093, USA.
Nature
|July 22, 2014
概括
植物通过对二氧化碳增加的反应来调节口腔发育. 这项研究确定了碳酸无水酶 (CA1,CA4) 和蛋白酶 (CRSP) 作为高CO2下口腔发育的关键抑制剂.
科学领域:
- 植物生物学 植物生物学
- 环境科学环境科学
- 分子遗传学 分子遗传学
背景情况:
- 植物调节口腔密度,以平衡二氧化碳吸收和水损失.
- 大气中二氧化碳水平的上升通常会降低口腔密度.
- 在口腔发育过程中,二氧化碳感知和信号传导的机制尚未完全理解.
研究的目的:
- 调查 CO2 调节的口腔发育背后的分子机制.
- 确定涉及植物对高CO2反应的基因和途径.
- 描述碳酸无水在这个过程中的作用.
主要方法:
- 对Arabidopsis thaliana碳酸无水酶双变异体 (ca1 ca4) 的分析.
- RNA测序 (RNA-seq) 用于分析基因表达变化.
- 细胞壁蛋白质组分析以确定分泌的蛋白质.
主要成果:
- 阿拉比多普西斯ca1ca4突变体在高CO2下显示出增加的口腔发育,逆转了典型的反应.
- 皮肤外纹造型因子2 (EPF2) 的表达是由野生类型的,但不是突变的叶子中的高CO2诱导的.
- 一种新的CO2诱导的细胞外蛋白酶,CRSP (CO2响应分泌蛋白酶),被确定并被证明可以分裂EPF2,抑制口腔发育.
结论:
- 碳酸无水酶 (CA1,CA4) 和分泌的蛋白酶CRSP对于在高CO2下抑制口腔发育至关重要.
- 一个涉及CRSP介导的EPF2裂变的细胞外信号通路介导CO2信号.
- 这项研究提供了植物适应不断变化的大气条件的洞察力,并调节了气体交换.
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