液泡
拟南芥
酵母
酿酒酵母
突变体
拟南芥
生物
细胞生物学
基因组
生物化学
基因
细胞质
作者
Ren‐Jie Tang,Su-Fang Meng,Xiaojiang Zheng,Bin Zhang,Yang Yang,Chao Wang,Aigen Fu,Fugeng Zhao,Wenzhi Lan,Sheng Luan
出处
期刊:Nature plants
[Springer Nature]
日期:2022-01-27
卷期号:8 (2): 181-190
被引量:20
标识
DOI:10.1038/s41477-021-01087-6
摘要
Magnesium (Mg2+) is an essential nutrient for all life forms. In fungal and plant cells, the majority of Mg2+ is stored in the vacuole but mechanisms for Mg2+ transport into the vacuolar store are not fully understood. Here we demonstrate that members of ancient conserved domain proteins (ACDPs) from Saccharomyces cerevisiae and Arabidopsis thaliana function in vacuolar Mg2+ sequestration that enables plant and yeast cells to cope with high levels of external Mg2+. We show that the yeast genome (as well as other fungal genomes) harbour a single ACDP homologue, referred to as MAM3, that functions specifically in vacuolar Mg2+ accumulation and is essential for tolerance to high Mg. In parallel, vacuolar ACDP homologues were identified from Arabidopsis and shown to complement the yeast mutant mam3Δ. An Arabidopsis mutant lacking one of the vacuolar ACDP homologues displayed hypersensitivity to high-Mg conditions and accumulated less Mg in the vacuole compared with the wild type. Taken together, our results suggest that conserved transporters mediate vacuolar Mg2+ sequestration in fungal and plant cells to maintain cellular Mg2+ homeostasis in response to fluctuating Mg2+ levels in the environment.
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