Ying Zhang, Yaoyao Song, Tianxue Shang, Yanni Tang, Hong Chen, Hao Ma, Xueping Zhang, Zhibo Miao, Baoqiong Lan, Lei Wang, Ning Cao, Xiaoning Liu, Zhenfeng An, Rongfang Lian, Tao Yang, Peng Chen, Chengjin Jiao, Quanle Xu
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引用次数: 0
Abstract
The neuroactive β-N-oxalyl-L-α,β-diaminopropionic acid (β-ODAP) was first identified in Lathyrus sativus and present also in several Chinese traditional herbs including Panax notoginseng. It exhibit toxicological effects as the causative agent of neurolathyrism when L. sativus was over-consumed under drought-triggered famines or pharmacological effects including neuroprotection and wound healing. Determinating of β-ODAP synthetase (BOS) will accelerate plant improvement and utilisation of those species containing β-ODAP. In this report, trace level of β-ODAP was confirmed in several cultivars of Pisum sativum, a close relative of L. sativus. Functions of LsBAHD3 and LsAAE3 were investigated via its transient expression in Nicotiana benthamiana, in vitro enzymatic activity assay and overexpression in hairy roots of L. sativus and P. sativum, etc. The results suggested that LsBAHD3 act as BOS, while LsAAE3 function as oxalyl-CoA synthetase to catalyse/promote β-ODAP biosynthesis. Further comparison and verification of LsBAHD3-specific and LsAAE3-specific protein interactome suggested that the LsBAHD3-LsAAE3 module catalyses β-ODAP biosynthesis, and the ubiquitin/26S proteasome system is highly involved in the regulation of BOS and β-ODAP content and may be responsible for the different level of β-ODAP in L. sativus and P. sativum. These results provide valuable insight into the biochemical and genetic mechanisms of β-ODAP biosynthesis.
LsBAHD3-LsAAE3模块催化莴苣和莴苣中β- n -草酰- l -α、β-二氨基丙酸的生物合成。
神经活性物质β- n -草酰- l -α,β-二氨基丙酸(β-ODAP)最早在土草中发现,在三七等中草药中也有发现。当在干旱引发的饥荒中过量食用L. sativus时,它表现出作为神经炎病原体的毒理学效应或包括神经保护和伤口愈合的药理学效应。β-ODAP合成酶(BOS)的测定将促进含有β-ODAP的植物的改良和利用。本研究在油菜(L. sativus)的近亲Pisum sativum的几个品种中证实了微量β-ODAP的存在。通过对LsBAHD3和LsAAE3在烟叶中的瞬时表达、体外酶活性测定以及在L. sativus和P. sativum等植物毛状根中的过表达研究了其功能。结果表明,LsBAHD3作为BOS,而LsAAE3作为草酰辅酶a合成酶,催化/促进β-ODAP的生物合成。进一步对lsbahd3特异性蛋白互作组和lsaae3特异性蛋白互作组的比较验证表明,LsBAHD3-LsAAE3模块催化了β-ODAP的生物合成,泛素/26S蛋白酶体系统高度参与了油菜和油菜中BOS和β-ODAP含量的调控,可能是造成油菜中β-ODAP水平不同的原因。这些结果为β-ODAP生物合成的生化和遗传机制提供了有价值的见解。
期刊介绍:
Plant, Cell & Environment is a premier plant science journal, offering valuable insights into plant responses to their environment. Committed to publishing high-quality theoretical and experimental research, the journal covers a broad spectrum of factors, spanning from molecular to community levels. Researchers exploring various aspects of plant biology, physiology, and ecology contribute to the journal's comprehensive understanding of plant-environment interactions.