7WST image
Entry Detail
PDB ID:
7WST
EMDB ID:
Keywords:
Title:
Cryo-EM structure of the barley Yellow stripe 1 transporter in complex with Fe(III)-DMA
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2022-02-01
Release Date:
2022-11-30
Method Details:
Experimental Method:
Resolution:
2.70 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Iron-phytosiderophore transporter
Chain IDs:A, B
Chain Length:690
Number of Molecules:2
Biological Source:Hordeum vulgare
Primary Citation
Uptake mechanism of iron-phytosiderophore from the soil based on the structure of yellow stripe transporter.
Nat Commun 13 7180 7180 (2022)
PMID: 36424382 DOI: 10.1038/s41467-022-34930-1

Abstact

Calcareous soils cover one-third of all land and cause severe growth defects in plants due to the poor water solubility of iron at high pH. Poaceae species use a unique chelation strategy, whereby plants secrete a high-affinity metal chelator, known as phytosiderophores (mugineic acids), and reabsorb the iron-phytosiderophore complex by the yellow stripe 1/yellow stripe 1-like (YS1/YSL) transporter for efficient uptake of iron from the soil. Here, we present three cryo-electron microscopy structures of barley YS1 (HvYS1) in the apo state, in complex with an iron-phytosiderophore complex, Fe(III)-deoxymugineic acid (Fe(III)-DMA), and in complex with the iron-bound synthetic DMA analog (Fe(III)-PDMA). The structures reveal a homodimeric assembly mediated through an anti-parallel β-sheet interaction with cholesterol hemisuccinate. Each protomer adopts an outward open conformation, and Fe(III)-DMA is bound near the extracellular space in the central cavity. Fe(III)-PDMA occupies the same binding site as Fe(III)-DMA, demonstrating that PDMA can function as a potent fertilizer in an essentially identical manner to DMA. Our results provide a structural framework for iron-phytosiderophore recognition and transport by YS1/YSL transporters, which will enable the rational design of new, high-potency fertilizers.

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