7TY7

Cryo-EM structure of human Anion Exchanger 1 bound to Bicarbonate

Summary for 7TY7

• Entry DOI: 10.2210/pdb7ty7/pdb
• EMDB information: 26168
• Descriptor: Band 3 anion transport protein, 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose, BICARBONATE ION, ... (6 entities in total)
• Functional Keywords: transmembrane, transport protein
• Biological source: Homo sapiens (human)
• Total number of polymer chains: 2
• Total formula weight: 209025.42

Authors

Capper, M.J.,Mathiharan, Y.K.,Yang, S.,Stone, A.C.,Wacker, D. (deposition date: 2022-02-11, release date: 2023-08-16, Last modification date: 2024-10-23)

Primary citation

Capper, M.J.,Yang, S.,Stone, A.C.,Vatansever, S.,Zilberg, G.,Mathiharan, Y.K.,Habib, R.,Hutchinson, K.,Zhao, Y.,Schlessinger, A.,Mezei, M.,Osman, R.,Zhang, B.,Wacker, D.
Substrate binding and inhibition of the anion exchanger 1 transporter.
Nat.Struct.Mol.Biol., 30:1495-1504, 2023

PubMed Abstract: Anion exchanger 1 (AE1), a member of the solute carrier (SLC) family, is the primary bicarbonate transporter in erythrocytes, regulating pH levels and CO transport between lungs and tissues. Previous studies characterized its role in erythrocyte structure and provided insight into transport regulation. However, key questions remain regarding substrate binding and transport, mechanisms of drug inhibition and modulation by membrane components. Here we present seven cryo-EM structures in apo, bicarbonate-bound and inhibitor-bound states. These, combined with uptake and computational studies, reveal important molecular features of substrate recognition and transport, and illuminate sterol binding sites, to elucidate distinct inhibitory mechanisms of research chemicals and prescription drugs. We further probe the substrate binding site via structure-based ligand screening, identifying an AE1 inhibitor. Together, our findings provide insight into mechanisms of solute carrier transport and inhibition.

PubMed: 37679563
DOI: 10.1038/s41594-023-01085-6

Experimental method

ELECTRON MICROSCOPY (3.37 Å)