Cryo-EM structure of human BTR1 in the inward-facing state with R125H mutation

Experimental Data Snapshot

  • Resolution: 2.96 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


Structural insights into the conformational changes of BTR1/SLC4A11 in complex with PIP 2.

Lu, Y.Zuo, P.Chen, H.Shan, H.Wang, W.Dai, Z.Xu, H.Chen, Y.Liang, L.Ding, D.Jin, Y.Yin, Y.

(2023) Nat Commun 14: 6157-6157

  • DOI: https://doi.org/10.1038/s41467-023-41924-0
  • Primary Citation of Related Structures:  
    7X1G, 7X1H, 7X1I, 7X1J

  • PubMed Abstract: 

    BTR1 (SLC4A11) is a NH 3 stimulated H + (OH - ) transporter belonging to the SLC4 family. Dysfunction of BTR1 leads to diseases such as congenital hereditary endothelial dystrophy (CHED) and Fuchs endothelial corneal dystrophy (FECD). However, the mechanistic basis of BTR1 activation by alkaline pH, transport activity regulation and pathogenic mutations remains elusive. Here, we present cryo-EM structures of human BTR1 in the outward-facing state in complex with its activating ligands PIP 2 and the inward-facing state with the pathogenic R125H mutation. We reveal that PIP 2 binds at the interface between the transmembrane domain and the N-terminal cytosolic domain of BTR1. Disruption of either the PIP 2 binding site or protonation of PIP 2 phosphate groups by acidic pH can transform BTR1 into an inward-facing conformation. Our results provide insights into the mechanisms of how the transport activity and conformation changes of BTR1 are regulated by PIP 2 binding and interaction of TMD and NTD.

  • Organizational Affiliation

    Institute of Precision Medicine, Peking University Shenzhen Hospital, Shenzhen, 518036, China.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Isoform 1 of Solute carrier family 4 member 11
A, B
891Homo sapiensMutation(s): 0 
Gene Names: SLC4A11BTR1
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for Q8NBS3 (Homo sapiens)
Explore Q8NBS3 
Go to UniProtKB:  Q8NBS3
GTEx:  ENSG00000088836 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8NBS3
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.96 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Natural Science Foundation of China (NSFC)China82030081
National Natural Science Foundation of China (NSFC)China81874235

Revision History  (Full details and data files)

  • Version 1.0: 2023-10-04
    Type: Initial release
  • Version 1.1: 2023-10-11
    Changes: Database references