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TitleStructural and dynamic insights into SPDT for phosphorus allocation in rice.
Journal, issue, pagesSci China Life Sci, Year 2026
Publish dateJun 11, 2026
AuthorsHaitao He / Yan Liu / Jie Zhang / Xiaofeng Zheng / Lihuan Jiang / Zhangmeng Du / Jiaqi Zuo / Shuo Cao / Xuemei Peng / Zhiwen Zheng / Kun Li / Cuicui Shen / Yanke Chen / Ping Yin / Chuang Wang / Lizhong Xiong / Faming Dong / Zhu Liu /
PubMed AbstractPhosphorus is essential for plants, absorbed as inorganic phosphate (Pi) and distributed via specialized transporters. The SULTR-like phosphorus distribution transporter (SPDT) preferentially ...Phosphorus is essential for plants, absorbed as inorganic phosphate (Pi) and distributed via specialized transporters. The SULTR-like phosphorus distribution transporter (SPDT) preferentially allocates phosphorus to developing grains-an energetically costly process that can potentially be attenuated without affecting crop yield and germination, positioning SPDT as a prime target for sustainable agriculture. Here, we report cryo-EM structures of rice SPDT in Pi-bound and apo states, uncovering an elevator-type transport mechanism. The transmembrane region segregates into a mobile Pi-binding core domain and a stationary gate domain. Pi coordination involves specific residues within the core domain, followed by an electropositive vestibule that extends from the binding pocket to the cytoplasm. Integrative structural and smFRET analyses demonstrate a dynamic mechanism regulating the transporter's conformational equilibrium. In this mechanism, the transporter's intracellular STAS domain acts as a bidirectional conformation-switch: (i) membrane-proximal binding stabilizes the inward-facing state via interactions with the core/gate domains, while (ii) dissociation enables reset to the outward-facing state. This dynamic coupling elucidates the regulatory mechanism of the STAS domain, highlighting its universally conserved function across the SulP, SULTR, and SLC26 families. Our findings provide a mechanistic blueprint for engineering phosphorus allocation in crops to enhance nutrient-use efficiency.
External linksSci China Life Sci / PubMed:42295638
MethodsEM (single particle)
Resolution2.65 - 2.67 Å
Structure data

65146

9vky

EMDB-65146, PDB-9vky:
Cryo-EM structure of SULTR-like phosphate distribution transporter
Method: EM (single particle) / Resolution: 2.67 Å

65155

9vl5

EMDB-65155, PDB-9vl5:
Cryo-EM structure of SULTR-like phosphate distribution transporter with phosphate
Method: EM (single particle) / Resolution: 2.65 Å

Chemicals

ChemComp-PO4:
PHOSPHATE ION

Source
  • oryza sativa subsp. japonica (Japanese rice)
  • oryza sativa japonica group (Japanese rice)
KeywordsTRANSPORT PROTEIN / Phosphate distribution transporter / SULTR-like / Homodimer

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