《植物生理学报》 2015, 51(6): 829-834

植物向光素信号通路中NPH3蛋白的研究进展

乔新荣*, 陈琼

信阳农林学院生物技术系, 河南信阳464000

通信作者：乔新荣；E-mail: xinrong806@163.com；Tel: 0376-6698023

摘　要：

植物蓝光受体向光素(phototropin, PHOT)介导向光性、叶绿体运动、气孔开放、叶片平展及定位等许多生理反应, 使植物适应不同的光强环境。PHOT下游信号转导子NPH3是植物特有的NRL家族成员。蓝光激活PHOT1调控NPH3的去磷酸化, 以及CRL3^NPH3依赖的PHOT1泛素化是PHOT1诱导向光反应所必需的生理生化过程。NPH3调控生长素极性运输的研究及几个NPH3互作蛋白的分离鉴定有助于进一步解析向光弯曲机制。此外, NPH3也参与PHOT介导的叶片平展与定位。本文重点综述了NPH3参与PHOT1介导向光性的分子机制研究进展, 并对未来的研究方向进行了展望。

关键词：向光素; 非向光性下胚轴弯曲3; 信号转导

收稿：2015-04-08   修定：2015-05-29

资助：河南省教育厅重点科研项目(15A180058)。

Advances of NPH3 in Plant Phototropin Signaling

QIAO Xin-Rong*, CHEN Qiong

Biotechnology Department, Xinyang College of Agriculture and Forestry, Xinyang, Henan 464000, China

Corresponding author: QIAO Xin-Rong; E-mail: xinrong806@163.com; Tel: 0376-6698023

Abstract:

Blue-light receptors phototropin (PHOT) mediate a wide set of physiological and developmental responses in plant, including phototropism, chloroplast movements, stomatal opening, as well as leaf flattening and positioning, in response to many different light intensity environment. PHOT downstream signal transducer NPH3 is one of members of the plant-specific NRL protein family. Dephosphorylation of NPH3 by PHOT1 and CRL3^NPH3-dependent ubiquitination of PHOT1 are required for normal phototropic responsiveness. Meanwhile, research on NPH3 regulating auxin polar transport and several NPH3 interacting protein identified will further clarify mechanism of phototropism. In addition, NPH3 is also involved in controlling leaf flattening and positioning in PHOT signaling. This paper mainly reviewed research advances of molecular mechanism on NPH3 in PHOT1 signaling, and finally the possible research directions in this field are proposed.

Key words: phototropin; NPH3; signal transduction