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7YAJ

CryoEM structure of SPCA1a in E1-Mn-AMPPCP state subclass 1

Summary for 7YAJ
Entry DOI10.2210/pdb7yaj/pdb
EMDB information33714
DescriptorCalcium-transporting ATPase type 2C member 1, Nanobody head piece of megabody, PHOSPHOMETHYLPHOSPHONIC ACID ADENYLATE ESTER, ... (4 entities in total)
Functional Keywordsgolgi ca2+/mn2+ transporter, transport protein
Biological sourceHomo sapiens (human)
More
Total number of polymer chains2
Total formula weight118034.61
Authors
Chen, Z.,Watanabe, S.,Inaba, K. (deposition date: 2022-06-28, release date: 2023-03-22, Last modification date: 2024-10-16)
Primary citationChen, Z.,Watanabe, S.,Hashida, H.,Inoue, M.,Daigaku, Y.,Kikkawa, M.,Inaba, K.
Cryo-EM structures of human SPCA1a reveal the mechanism of Ca 2+ /Mn 2+ transport into the Golgi apparatus.
Sci Adv, 9:eadd9742-eadd9742, 2023
Cited by
PubMed Abstract: Secretory pathway Ca/Mn ATPase 1 (SPCA1) actively transports cytosolic Ca and Mn into the Golgi lumen, playing a crucial role in cellular calcium and manganese homeostasis. Detrimental mutations of the gene encoding SPCA1 cause Hailey-Hailey disease. Here, using nanobody/megabody technologies, we determined cryo-electron microscopy structures of human SPCA1a in the ATP and Ca/Mn-bound (E1-ATP) state and the metal-free phosphorylated (E2P) state at 3.1- to 3.3-Å resolutions. The structures revealed that Ca and Mn share the same metal ion-binding pocket with similar but notably different coordination geometries in the transmembrane domain, corresponding to the second Ca-binding site in sarco/endoplasmic reticulum Ca-ATPase (SERCA). In the E1-ATP to E2P transition, SPCA1a undergoes similar domain rearrangements to those of SERCA. Meanwhile, SPCA1a shows larger conformational and positional flexibility of the second and sixth transmembrane helices, possibly explaining its wider metal ion specificity. These structural findings illuminate the unique mechanisms of SPCA1a-mediated Ca/Mn transport.
PubMed: 36867705
DOI: 10.1126/sciadv.add9742
PDB entries with the same primary citation
Experimental method
ELECTRON MICROSCOPY (3.16 Å)
Structure validation

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