植物类LORELEI糖基磷脂酰肌醇锚定蛋白研究进展

Advances of LORELEI-like Glycosylphosphatidylinositol-anchor(LLG)Proteins in Plants

类LORELEI糖基磷脂酰肌醇锚定蛋白(LLG)定位于细胞质膜外表面,作为CrRLK1L家族类受体激酶的分子伴侣,参与其转运和胞外信号转导,从而调控植物生殖发育以及免疫与逆境应答等过程。LLG2/3与ANX和BUPS互作,调控花粉管顶端生长与爆裂。LLG1与FER(FERONIA)互作,调控下游的NADPH氧化酶产生活性氧(ROS),促进根部细胞伸长和根毛生长。此外,LLG1作为FER的共受体,与快速碱化因子(RALFs)互作,调节G蛋白β亚基(AGB1)和质膜H+-ATPase功能、胞内ROS稳态以及Ca2+瞬变,引起根部和气孔的盐应答反应。LLG1与FLS2和EFR互作激活下游RbohD,调节ROS产生,调控植物免疫应答。该文综述了植物LLG的相关研究进展,可为深入理解LLG的生物学功能提供重要信息。

The outer surface of plasma membrane(PM)-localized LORELEI-like glycosylphosphatidylinositol-anchor(LLG)proteins,as the molecular chaperone of CrRLK1 Ls family of receptor-like kinase,are involved in the transport of Cr RLKs and extracellular signal transduction,regulating plant reproduction,development,as well as immune and stress responses.LLG2/3 interacting with ANX and BUPS regulates pollen tube growth and rupture.LLG1 interacted with FER activates the ROPGEF1-ROP2-NADPH oxidase pathway for ROS production,and then promotes root cell elongation and root hair growth.Besides,LLG1,as co-receptor of FER,interacts with RALFs,and then regulates G proteinβ(AGB1),PM H+-ATPase activity,as well as the homeostasis of intracellular ROS and Ca2+,for modulating stomata and roots in response to salinity.For immune response,LLG1 interacts with FLS2 and EFR,activating the downstream RbohD for ROS production.This review provides important information for understanding LLG biological functions.