7WIT | pdb_00007wit

Structure of SUR1 in complex with mitiglinide

• PDB DOI: https://doi.org/10.2210/pdb7WIT/pdb
• EM Map EMD-32535: EMDB EMDataResource

• Classification: MEMBRANE PROTEIN
• Organism(s): Bos taurus, Mesocricetus auratus
• Expression System: Homo sapiens
• Mutation(s): No 
• Membrane Protein: Yes  PDBTM


• Deposited: 2022-01-04 Released: 2022-11-16 
• Deposition Author(s): Chen, L., Wang, M.M.
• Funding Organization(s): National Natural Science Foundation of China (NSFC)

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 3.21 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Literature

Structural Insights Into the High Selectivity of the Anti-Diabetic Drug Mitiglinide

Wang, M.M., Wu, J.X., Chen, L.

(2022) Front Pharmacol 13: 929684-929684

• PubMed: 35847046 
• DOI: https://doi.org/10.3389/fphar.2022.929684
• Primary Citation of Related Structures:  
  7WIT


• PubMed Abstract: 
  

  Mitiglinide is a highly selective fast-acting anti-diabetic drug that induces insulin secretion by inhibiting pancreatic K _ATP channels. However, how mitiglinide binds K _ATP channels remains unknown. Here, we show the cryo-EM structure of the SUR1 subunit complexed with mitiglinide. The structure reveals that mitiglinide binds inside the common insulin secretagogue-binding site of SUR1, which is surrounded by TM7, TM8, TM16, and TM17. Mitiglinide locks SUR1 in the NBD-separated inward-facing conformation. The detailed structural analysis of the mitiglinide-binding site uncovers the molecular basis of its high selectivity.

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Organizational Affiliation: 
• State Key Laboratory of Membrane Biology, Beijing Key Laboratory of Cardiometabolic Molecular Medicine, College of Future Technology, Institute of Molecular Medicine, Peking University, Beijing, China.
Peking-Tsinghua Center for Life Sciences, Peking University, Beijing, China.
Academy for Advanced Interdisciplinary Studies, Peking University, Beijing, China.
National Biomedical Imaging Center, Peking University, Beijing, China.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: gel filtration

Macromolecule Content 

• Total Structure Weight: 160.26 kDa 
• Atom Count: 8,109 
• Modeled Residue Count: 1,133 
• Deposited Residue Count: 1,434 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
ATP-sensitive inward rectifier potassium channel 11,ATP-binding cassette sub-family C member 8 isoform X1	A	1,434	Bos taurus, Mesocricetus auratus This entity is chimeric	Mutation(s): 0  Gene Names: KCNJ11, Abcc8 Membrane Entity: Yes
UniProt
Find proteins for A0A1U7R319 (Mesocricetus auratus) Explore A0A1U7R319  Go to UniProtKB:  A0A1U7R319
Find proteins for A2VDS4 (Bos taurus) Explore A2VDS4  Go to UniProtKB:  A2VDS4
UniProt Groups	A0A1U7R319A2VDS4

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ATP	B [auth A]	ADENOSINE-5'-TRIPHOSPHATE C10 H16 N5 O13 P3 ZKHQWZAMYRWXGA-KQYNXXCUSA-N
9I0 (Subject of Investigation/LOI)	C [auth A]	(2S)-4-[(3aR,7aS)-1,3,3a,4,5,6,7,7a-octahydroisoindol-2-yl]-4-oxidanylidene-2-(phenylmethyl)butanoic acid C19 H25 N O3 WPGGHFDDFPHPOB-BBWFWOEESA-N

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 3.21 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: 2022-11-16 
Deposition Author(s): Chen, L., Wang, M.M.

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Funding Organization	Location	Grant Number
National Natural Science Foundation of China (NSFC)	China	91957201 and 31870833

Revision History  

• Version 1.0: 2022-11-16
  Type: Initial release
  
• Version 1.1: 2022-12-21
  Changes: Database references
• Version 1.2: 2024-06-26
  Changes: Data collection
• Version 1.3: 2025-07-02
  Changes: Data collection, Structure summary