8GVC

The cryo-EM structure of hAE2 with bicarbonate


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.89 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

The structural basis of the pH-homeostasis mediated by the Cl - /HCO 3 - exchanger, AE2.

Zhang, Q.Jian, L.Yao, D.Rao, B.Xia, Y.Hu, K.Li, S.Shen, Y.Cao, M.Qin, A.Zhao, J.Cao, Y.

(2023) Nat Commun 14: 1812-1812

  • DOI: https://doi.org/10.1038/s41467-023-37557-y
  • Primary Citation of Related Structures:  
    8GV8, 8GV9, 8GVA, 8GVC, 8GVE, 8GVF, 8GVH

  • PubMed Abstract: 

    The cell maintains its intracellular pH in a narrow physiological range and disrupting the pH-homeostasis could cause dysfunctional metabolic states. Anion exchanger 2 (AE2) works at high cellular pH to catalyze the exchange between the intracellular HCO 3 - and extracellular Cl - , thereby maintaining the pH-homeostasis. Here, we determine the cryo-EM structures of human AE2 in five major operating states and one transitional hybrid state. Among those states, the AE2 shows the inward-facing, outward-facing, and intermediate conformations, as well as the substrate-binding pockets at two sides of the cell membrane. Furthermore, critical structural features were identified showing an interlock mechanism for interactions among the cytoplasmic N-terminal domain and the transmembrane domain and the self-inhibitory effect of the C-terminal loop. The structural and cell-based functional assay collectively demonstrate the dynamic process of the anion exchange across membranes and provide the structural basis for the pH-sensitive pH-rebalancing activity of AE2.


  • Organizational Affiliation

    Department of Orthopaedics, Shanghai Key Laboratory of Orthopaedic Implant, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, 200011, Shanghai, China.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Anion exchange protein 2
A, B
1,241Homo sapiensMutation(s): 0 
Gene Names: SLC4A2AE2EPB3L1HKB3MPB3L
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for P04920 (Homo sapiens)
Explore P04920 
Go to UniProtKB:  P04920
PHAROS:  P04920
GTEx:  ENSG00000164889 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP04920
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.89 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Ministry of Science and Technology (MoST, China)China2018YFC1004704
National Natural Science Foundation of China (NSFC)China82072468

Revision History  (Full details and data files)

  • Version 1.0: 2023-04-12
    Type: Initial release
  • Version 1.1: 2024-06-19
    Changes: Data collection