8Y6M image
Entry Detail
PDB ID:
8Y6M
EMDB ID:
Keywords:
Title:
The structure of Oryza sativa HKT2;1
Biological Source:
PDB Version:
Deposition Date:
2024-02-02
Release Date:
2024-12-11
Method Details:
Experimental Method:
Resolution:
2.91 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Cation transporter HKT2;1,Soluble cytochrome b562
Chain IDs:A, B
Chain Length:628
Number of Molecules:2
Biological Source:Oryza sativa Indica Group x Oryza nivara, Escherichia coli
Ligand Molecules
Primary Citation
Structural insights into the Oryza sativa cation transporters HKTs in salt tolerance.
J Integr Plant Biol 66 700 708 (2024)
PMID: 38409933 DOI: 10.1111/jipb.13632

Abstact

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.

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Primary Citation of related structures