| Symbols: | ATP2A1-3 |
| UniProt: | [ATP2A1](https://www.uniprot.org/uniprot/P04177), [ATP2A2](https://www.uniprot.org/uniprot/P16615), [ATP2A3](https://www.uniprot.org/uniprot/Q93084) |
| Molecular Weight: | 110 kDa |
| Location: | Endoplasmic/sarcoplasmic reticulum membrane |
| PDB: | [1SU4](https://www.rcsb.org/structure/1SU4), [3N5K](https://www.rcsb.org/structure/3N5K) |
SERCA (Sarco/Endoplasmic Reticulum Ca²⁺-ATPase) pumps calcium ions from the cytosol into the endoplasmic reticulum (ER), maintaining the steep calcium gradient essential for calcium signaling. Three isoforms (SERCA1-3, encoded by ATP2A1-3) serve different tissues, with SERCA2b and SERCA3 prominent in neurons. SERCA dysfunction contributes to calcium dysregulation in Alzheimer's disease, Parkinson's disease, and Huntington's disease.[1][2]
SERCA is a P-type ATPase with key functional domains:[3]
Three genes encode SERCA isoforms with distinct properties:
| Isoform | Gene | Tissue | Notes |
|---|---|---|---|
| SERCA1a/1b | ATP2A1 | Fast-twitch skeletal muscle | Developmental switch |
| SERCA2a/2b | ATP2A2 | Cardiac muscle, neurons | 2b is housekeeping isoform |
| SERCA3 | ATP2A3 | Epithelial, hematopoietic, neurons | Lower calcium affinity |
SERCA2b is the predominant neuronal isoform.[4]
SERCA maintains ER calcium homeostasis:
SERCA activity creates:[5]
SERCA activity is modulated by:
SERCA dysfunction in AD:[6]
ER-mitochondria calcium crosstalk disrupted in PD:[7]
Mutant huntingtin impacts SERCA:[8]
An unexpected connection:[9]
Strategies to enhance SERCA function:
Used to study calcium dynamics:
MacLennan DH et al. Structure-function relationships in the Ca²⁺-pump of the sarcoplasmic reticulum. Acta Physiologica Scandinavica. 1997. ↩︎
Strehler EE, Treiman M. Calcium pumps: general overview. Molecular Aspects of the Calcium Pump Family. 2004. ↩︎
Toyoshima C et al. Crystal structure of the calcium pump of sarcoplasmic reticulum at 2.6 Å resolution. Nature. 2000. ↩︎
Wuytack F et al. SERCA2a and SERCA2b isoforms of the sarco(endo)plasmic reticulum Ca²⁺-ATPase. Annals of the New York Academy of Sciences. 2003. ↩︎
Brini M et al. Neuronal calcium signaling: function and dysfunction. Cell and Tissue Research. 2014. ↩︎
Green KN et al. SERCA pump activity is physiologically regulated by presenilin and regulates amyloid β production. Journal of Cell Biology. 2008. ↩︎
Selvaraj S et al. Neurotoxin-induced ER stress in mouse dopaminergic neurons involves downregulation of SERCA2b. Neurobiology of Disease. 2012. ↩︎
Higo T et al. Altered ER calcium homeostasis in Huntington's disease neurons. Neurodegenerative Diseases. 2010. ↩︎
Mynett-Johnson L et al. Evidence for an association between the gene encoding the Ca²⁺-ATPase and bipolar disorder. American Journal of Medical Genetics. 2000. ↩︎