8IWP

hSPCA1 in the CaE1 state


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.59 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


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Literature

Structure and transport mechanism of the human calcium pump SPCA1.

Wu, M.Wu, C.Song, T.Pan, K.Wang, Y.Liu, Z.

(2023) Cell Res 33: 533-545

  • DOI: https://doi.org/10.1038/s41422-023-00827-x
  • Primary Citation of Related Structures:  
    8IWP, 8IWR, 8IWS, 8IWT, 8IWU, 8IWW

  • PubMed Abstract: 

    Secretory-pathway Ca 2+ -ATPases (SPCAs) play critical roles in maintaining Ca 2+ homeostasis, but the exact mechanism of SPCAs-mediated Ca 2+ transport remains unclear. Here, we determined six cryo-electron microscopy (cryo-EM) structures of human SPCA1 (hSPCA1) in a series of intermediate states, revealing a near-complete conformational cycle. With the aid of molecular dynamics simulations, these structures offer a clear structural basis for Ca 2+ entry and release in hSPCA1. We found that hSPCA1 undergoes unique conformational changes during ATP binding and phosphorylation compared to other well-studied P-type II ATPases. In addition, we observed a conformational distortion of the Ca 2+ -binding site induced by the separation of transmembrane helices 4L and 6, unveiling a distinct Ca 2+ release mechanism. Particularly, we determined a structure of the long-sought CaE2P state of P-type IIA ATPases, providing valuable insights into the Ca 2+ transport cycle. Together, these findings enhance our understanding of Ca 2+ transport by hSPCA1 and broaden our knowledge of P-type ATPases.


  • Organizational Affiliation

    Department of Immunology and Microbiology, School of Life Sciences, Southern University of Science and Technology, Shenzhen, Guangdong, China.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Calcium-transporting ATPase type 2C member 1919Homo sapiensMutation(s): 0 
Gene Names: ATP2C1KIAA1347PMR1LHUSSY-28
EC: 7.2.2.10
UniProt & NIH Common Fund Data Resources
Find proteins for P98194 (Homo sapiens)
Go to UniProtKB:  P98194
PHAROS:  P98194
GTEx:  ENSG00000017260 
Sequence Annotations
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.59 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Science Foundation (NSF, China)China32000850

Revision History  (Full details and data files)

  • Version 1.0: 2023-12-27
    Type: Initial release