9IKV | pdb_00009ikv

human SLC26A7 with iodide

• PDB DOI: https://doi.org/10.2210/pdb9IKV/pdb
• EM Map EMD-60660: EMDB EMDataResource

• Classification: TRANSPORT PROTEIN
• Organism(s): Homo sapiens
• Expression System: Homo sapiens
• Mutation(s): No 
• Membrane Protein: Yes  MemProtMD


• Deposited: 2024-06-29 Released: 2025-07-02 
• Deposition Author(s): Li, X., Yang, X., Lu, X., Lin, B., Zhang, Y., Huang, B., Zhou, Y., Huang, J., Wu, K., Zhou, Q., Chi, X.
• Funding Organization(s): National Science Foundation (NSF, China)

---

Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 3.10 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Literature

Structural basis for substrate recognition mechanism of human SLC26A7.

Li, X., Yang, X., Lu, X., Lin, B., Zhang, Y., Huang, B., Zhou, Y., Huang, J., Wu, K., Zhou, Q., Chi, X.

(2025) Nat Commun 16: 7600-7600

• PubMed: 40817112 
• DOI: https://doi.org/10.1038/s41467-025-62792-w
• Primary Citation Related Structures: 
  9IKV, 9IKX


• PubMed 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.

---

Organizational Affiliation: 
• College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang, China.
Research Center for Industries of the Future, Zhejiang Key Laboratory of Structural Biology, School of Life Sciences, Westlake University, Westlake Laboratory of Life Sciences and Biomedicine, Hangzhou, Zhejiang, China.
Institute of Biology, Westlake Institute for Advanced Study, Hangzhou, Zhejiang, China.
Research Center for Industries of the Future, Zhejiang Key Laboratory of Structural Biology, School of Life Sciences, Westlake University, Westlake Laboratory of Life Sciences and Biomedicine, Hangzhou, Zhejiang, China. [e-mail].
Institute of Biology, Westlake Institute for Advanced Study, Hangzhou, Zhejiang, China. [e-mail].
Research Center for Industries of the Future, Zhejiang Key Laboratory of Structural Biology, School of Life Sciences, Westlake University, Westlake Laboratory of Life Sciences and Biomedicine, Hangzhou, Zhejiang, China. [e-mail].
Institute of Biology, Westlake Institute for Advanced Study, Hangzhou, Zhejiang, China. [e-mail].
Research Center for Industries of the Future, Zhejiang Key Laboratory of Structural Biology, School of Life Sciences, Westlake University, Westlake Laboratory of Life Sciences and Biomedicine, Hangzhou, Zhejiang, China. [e-mail].
Institute of Biology, Westlake Institute for Advanced Study, Hangzhou, Zhejiang, China. [e-mail].
State Key Laboratory for Cellular Stress Biology, Innovation Centre for Cell Signaling Network, School of Life Sciences, Xiamen University, Fujian, China. [e-mail].

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: electron microscopy

Macromolecule Content 

• Total Structure Weight: 145.06 kDa 
• Atom Count: 8,654 
• Modeled Residue Count: 1,124 
• Deposited Residue Count: 1,312 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Anion exchange transporter	A, B	656	Homo sapiens	Mutation(s): 0  Gene Names: SLC26A7, SUT2 Membrane Entity: Yes
UniProt & NIH Common Fund Data Resources
Find proteins for Q8TE54 (Homo sapiens) Explore Q8TE54  Go to UniProtKB:  Q8TE54
PHAROS:  Q8TE54 GTEx:  ENSG00000147606

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
IOD (Subject of Investigation/LOI)	C [auth A], D [auth A], E [auth B], F [auth B]	IODIDE ION I XMBWDFGMSWQBCA-UHFFFAOYSA-M

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 3.10 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

EM Software:

Task	Software Package	Version
MODEL REFINEMENT	PHENIX

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2025-07-02 
Deposition Author(s): Li, X., Yang, X., Lu, X., Lin, B., Zhang, Y., Huang, B., Zhou, Y., Huang, J., Wu, K., Zhou, Q., Chi, X.

---

Funding Organization	Location	Grant Number
National Science Foundation (NSF, China)	China	32100975

Revision History  

• Version 1.0: 2025-07-02
  Type: Initial release
  
• Version 1.1: 2026-07-15
  Changes: Data collection, Database references