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TitleStructural insights into the Oryza sativa cation transporters HKTs in salt tolerance.
Journal, issue, pagesJ Integr Plant Biol, Vol. 66, Issue 4, Page 700-708, Year 2024
Publish dateFeb 26, 2024
AuthorsRan Gao / Yutian Jia / Xia Xu / Peng Fu / Jiaqi Zhou / Guanghui Yang /
PubMed AbstractThe 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.
External linksJ Integr Plant Biol / PubMed:38409933
MethodsEM (single particle)
Resolution2.91 - 3.46 Å
Structure data

38988

8y6j

EMDB-38988, PDB-8y6j:
The structure of Oryza sativa HKT1;1
Method: EM (single particle) / Resolution: 3.46 Å

38990

8y6l

EMDB-38990, PDB-8y6l:
Oryza sativa HKT1;5 salt sensitive variant
Method: EM (single particle) / Resolution: 3.4 Å

38991

8y6m

EMDB-38991, PDB-8y6m:
The structure of Oryza sativa HKT2;1
Method: EM (single particle) / Resolution: 2.91 Å

38992

8y6n

EMDB-38992, PDB-8y6n:
The structure of Oryza sativa HKT1;5 salt tolerant variant
Method: EM (single particle) / Resolution: 3.4 Å

Source
  • oryza sativa (Asian cultivated rice)
  • oryza sativa indica group x oryza nivara (rice)
  • escherichia coli (E. coli)
KeywordsPLANT PROTEIN / dimer / transmembrane protein / sodium transporter / BRIL-fused / MEMBRANE PROTEIN / sodium/potassium sympoter / homodomer

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