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Structure and function of an Arabidopsis thaliana sulfate transporter

Author

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  • Lie Wang

    (Baylor College of Medicine)

  • Kehan Chen

    (Baylor College of Medicine)

  • Ming Zhou

    (Baylor College of Medicine)

Abstract

Plant sulfate transporters (SULTR) mediate absorption and distribution of sulfate (SO42−) 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 SO42− 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 SO42− is coordinated by side-chain hydroxyls and backbone amides, and further stabilized electrostatically by the conserved Arg393 and two helix dipoles. Proton and SO42− are co-transported by AtSULTR4;1 and a proton gradient significantly enhances SO42− transport. Glu347, which is ~7 Å from the bound SO42−, 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 SO42− transport, suggesting a regulatory function of the STAS domain.

Suggested Citation

  • Lie Wang & Kehan Chen & Ming Zhou, 2021. "Structure and function of an Arabidopsis thaliana sulfate transporter," Nature Communications, Nature, vol. 12(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-24778-2
    DOI: 10.1038/s41467-021-24778-2
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    Cited by:

    1. Mingxing Wang & Jin He & Shanshan Li & Qianwen Cai & Kaiming Zhang & Ji She, 2023. "Structural basis of vitamin C recognition and transport by mammalian SVCT1 transporter," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    2. Makoto F. Kuwabara & Bassam G. Haddad & Dominik Lenz-Schwab & Julia Hartmann & Piersilvio Longo & Britt-Marie Huckschlag & Anneke Fuß & Annalisa Questino & Thomas K. Berger & Jan-Philipp Machtens & Do, 2023. "Elevator-like movements of prestin mediate outer hair cell electromotility," Nature Communications, Nature, vol. 14(1), pages 1-18, December.
    3. Haon Futamata & Masahiro Fukuda & Rie Umeda & Keitaro Yamashita & Atsuhiro Tomita & Satoe Takahashi & Takafumi Shikakura & Shigehiko Hayashi & Tsukasa Kusakizako & Tomohiro Nishizawa & Kazuaki Homma &, 2022. "Cryo-EM structures of thermostabilized prestin provide mechanistic insights underlying outer hair cell electromotility," Nature Communications, Nature, vol. 13(1), pages 1-14, December.
    4. Lie Wang & Ming Zhou, 2023. "Structure of a eukaryotic cholinephosphotransferase-1 reveals mechanisms of substrate recognition and catalysis," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    5. Lie Wang & Anthony Hoang & Eva Gil-Iturbe & Arthur Laganowsky & Matthias Quick & Ming Zhou, 2024. "Mechanism of anion exchange and small-molecule inhibition of pendrin," Nature Communications, Nature, vol. 15(1), pages 1-11, December.
    6. Wenxin Hu & Alex Song & Hongjin Zheng, 2024. "Substrate binding plasticity revealed by Cryo-EM structures of SLC26A2," Nature Communications, Nature, vol. 15(1), pages 1-9, December.

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