Structural basis for substrate recognition mechanism of human SLC26A7

Xiaorong Li, Xiaoxu Yang, Xiaoli Lu, Bingqian Lin, Yuanyuan Zhang, Bangdong Huang, Yutong Zhou, Jing Huang (), Kun Wu (), Qiang Zhou () and Ximin Chi ()
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Xiaorong Li: Zhejiang University
Xiaoxu Yang: Westlake University, Westlake Laboratory of Life Sciences and Biomedicine
Xiaoli Lu: Westlake University, Westlake Laboratory of Life Sciences and Biomedicine
Bingqian Lin: Westlake University, Westlake Laboratory of Life Sciences and Biomedicine
Yuanyuan Zhang: Zhejiang University
Bangdong Huang: Westlake University, Westlake Laboratory of Life Sciences and Biomedicine
Yutong Zhou: Westlake University, Westlake Laboratory of Life Sciences and Biomedicine
Jing Huang: Westlake University, Westlake Laboratory of Life Sciences and Biomedicine
Kun Wu: Westlake University, Westlake Laboratory of Life Sciences and Biomedicine
Qiang Zhou: Westlake University, Westlake Laboratory of Life Sciences and Biomedicine
Ximin Chi: Xiamen University

Nature Communications, 2025, vol. 16, issue 1, 1-10

Abstract: Abstract Solute carrier family 26 (SLC26) mainly mediates transmembrane transport of various anion ions, including chloride and other halide ions, bicarbonate, oxalate, and sulfate. Many severe hereditary human diseases are correlated with SLC26 protein mutations. Here we report cryo-EM structures of human SLC26A7 in apo and iodide binding states. We identify non-canonical binding site for halide ions in SLC26A7. Molecular dynamics simulation and electrophysiological assay confirm the functional importance of key residues involved in iodide and chloride coordination. Together, our discovery marks a step towards an in-depth understanding of SLC26 family protein transport mechanisms.

Date: 2025
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DOI: 10.1038/s41467-025-62792-w

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