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TitleStructure and function of an Arabidopsis thaliana sulfate transporter.
Journal, issue, pagesNat Commun, Vol. 12, Issue 1, Page 4455, Year 2021
Publish dateJul 22, 2021
AuthorsLie Wang / Kehan Chen / Ming Zhou /
PubMed AbstractPlant sulfate transporters (SULTR) mediate absorption and distribution of sulfate (SO) and are essential for plant growth; however, our understanding of their structures and functions remains ...Plant sulfate transporters (SULTR) mediate absorption and distribution of sulfate (SO) and are essential for plant growth; however, our understanding of their structures and functions remains inadequate. Here we present the structure of a SULTR from Arabidopsis thaliana, AtSULTR4;1, in complex with SO at an overall resolution of 2.8 Å. AtSULTR4;1 forms a homodimer and has a structural fold typical of the SLC26 family of anion transporters. The bound SO is coordinated by side-chain hydroxyls and backbone amides, and further stabilized electrostatically by the conserved Arg393 and two helix dipoles. Proton and SO are co-transported by AtSULTR4;1 and a proton gradient significantly enhances SO transport. Glu347, which is ~7 Å from the bound SO, is required for H-driven transport. The cytosolic STAS domain interacts with transmembrane domains, and deletion of the STAS domain or mutations to the interface compromises dimer formation and reduces SO transport, suggesting a regulatory function of the STAS domain.
External linksNat Commun / PubMed:34294705 / PubMed Central
MethodsEM (single particle)
Resolution2.75 Å
Structure data

23351

7lhv

EMDB-23351, PDB-7lhv:
Structure of Arabidopsis thaliana sulfate transporter AtSULTR4;1
Method: EM (single particle) / Resolution: 2.75 Å

Chemicals

ChemComp-S1P:
(2S,3R,4E)-2-amino-3-hydroxyoctadec-4-en-1-yl dihydrogen phosphate

ChemComp-SO4:
SULFATE ION

ChemComp-LBN:
1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine / phospholipid*YM

ChemComp-HOH:
WATER

Source
  • arabidopsis thaliana (thale cress)
KeywordsTRANSPORT PROTEIN / Sulfate transport / SLC26 / MEMBRANE PROTEIN

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