An endoplasmic reticulum–localized cytochrome b 5 regulates high-affinity K + transport in response to salt stress in rice

作者：Tengzhao Song, Yiyuan Shi, Like Shen, Chengjuan Cao, Yue Shen, Wen Jing, Quanxiang Tian, Feng Lin, Wenyu Li, Wenhua Zhang · 发表于：Proceedings of the National Academy of Sciences · 年份：2021 · DOI：10.1073/pnas.2114347118 · 被引用次数：52 · 研究领域：Plant Stress Responses and Tolerance、Plant nutrient uptake and metabolism、Photosynthetic Processes and Mechanisms

Significance High-affinity K + (HAK) transporter-mediated K + uptake has an important role when plants are subjected to stresses. This work identifies a mechanism of HAK regulation. The affinity of HAK at the plasma membrane for K + depends on the binding of a cytochrome (CYB5) protein at the endoplasmic reticulum. This improves K + uptake and the ability of plants to survive under saline conditions. The HAK–CYB5 interaction not only constitutes a mechanism of HAK regulation but also reflects interorganelle communication mediated by functional protein interactions under conditions of stress.