sodium/potassium sympoter / homodomer / transmembrane protein / BRIL-fused / PLANT PROTEIN
機能・相同性
機能・相同性情報
monoatomic cation transmembrane transporter activity / sodium ion transport / electron transport chain / potassium ion transport / periplasmic space / electron transfer activity / iron ion binding / heme binding / plasma membrane 類似検索 - 分子機能
: / Cation transporter / Cation transport protein / Cytochrome b562 / Cytochrome b562 / Cytochrome c/b562 類似検索 - ドメイン・相同性
National Natural Science Foundation of China (NSFC)
32171188
中国
引用
ジャーナル: J Integr Plant Biol / 年: 2024 タイトル: Structural insights into the Oryza sativa cation transporters HKTs in salt tolerance. 著者: Ran Gao / Yutian Jia / Xia Xu / Peng Fu / Jiaqi Zhou / Guanghui Yang / 要旨: The high-affinity potassium transporters (HKTs), selectively permeable to either Na alone or Na/K, play pivotal roles in maintaining plant Na/K homeostasis. Although their involvement in salt ...The high-affinity potassium transporters (HKTs), selectively permeable to either Na alone or Na/K, play pivotal roles in maintaining plant Na/K homeostasis. Although their involvement in salt tolerance is widely reported, the molecular underpinnings of Oryza sativa HKTs remain elusive. In this study, we elucidate the structures of OsHKT1;1 and OsHKT2;1, representing two distinct classes of rice HKTs. The dimeric assembled OsHKTs can be structurally divided into four domains. At the dimer interface, a half-helix or a loop in the third domain is coordinated by the C-terminal region of the opposite subunit. Additionally, we present the structures of OsHKT1;5 salt-tolerant and salt-sensitive variants, a key quantitative trait locus associated with salt tolerance. The salt-tolerant variant of OsHKT1;5 exhibits enhanced Na transport capability and displays a more flexible conformation. These findings shed light on the molecular basis of rice HKTs and provide insights into their role in salt tolerance.