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Open data
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Basic information
Entry | Database: PDB / ID: 7yai | |||||||||
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Title | CryoEM structure of SPCA1a in E1-Ca-AMPPCP state subclass 3 | |||||||||
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![]() | TRANSPORT PROTEIN / Golgi Ca2+/Mn2+ transporter | |||||||||
Function / homology | ![]() Golgi calcium ion homeostasis / Golgi calcium ion transport / P-type manganese transporter activity / trans-Golgi network membrane organization / manganese ion transport / cis-Golgi network membrane / intracellular manganese ion homeostasis / P-type Ca2+ transporter / P-type calcium transporter activity / calcium-dependent cell-cell adhesion via plasma membrane cell adhesion molecules ...Golgi calcium ion homeostasis / Golgi calcium ion transport / P-type manganese transporter activity / trans-Golgi network membrane organization / manganese ion transport / cis-Golgi network membrane / intracellular manganese ion homeostasis / P-type Ca2+ transporter / P-type calcium transporter activity / calcium-dependent cell-cell adhesion via plasma membrane cell adhesion molecules / positive regulation of Golgi to plasma membrane protein transport / Golgi cisterna membrane / Ion transport by P-type ATPases / epidermis development / calcium ion transmembrane transport / trans-Golgi network / intracellular calcium ion homeostasis / calcium ion transport / manganese ion binding / actin cytoskeleton organization / positive regulation of canonical NF-kappaB signal transduction / Golgi membrane / calcium ion binding / Golgi apparatus / endoplasmic reticulum / ATP hydrolysis activity / ATP binding / membrane / metal ion binding / plasma membrane Similarity search - Function | |||||||||
Biological species | ![]() ![]() ![]() | |||||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.14 Å | |||||||||
![]() | Chen, Z. / Watanabe, S. / Inaba, K. | |||||||||
Funding support | ![]()
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![]() | ![]() Title: Cryo-EM structures of human SPCA1a reveal the mechanism of Ca/Mn transport into the Golgi apparatus. Authors: Zhenghao Chen / Satoshi Watanabe / Hironori Hashida / Michio Inoue / Yasukazu Daigaku / Masahide Kikkawa / Kenji Inaba / ![]() 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 ...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. | |||||||||
History |
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 201.9 KB | Display | ![]() |
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PDB format | ![]() | 157.3 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
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-Validation report
Arichive directory | ![]() ![]() | HTTPS FTP |
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-Related structure data
Related structure data | ![]() 33713MC ![]() 7yagC ![]() 7yahC ![]() 7yajC ![]() 7yamC M: map data used to model this data C: citing same article ( |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
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Assembly
Deposited unit | ![]()
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1 |
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Components
#1: Protein | Mass: 103574.203 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() |
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#2: Antibody | Mass: 13900.263 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() ![]() |
#3: Chemical | ChemComp-ACP / |
#4: Chemical | ChemComp-CA / |
Has ligand of interest | Y |
-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
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Sample preparation
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Buffer solution | pH: 6 | ||||||||||||||||||||||||
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES | ||||||||||||||||||||||||
Vitrification | Cryogen name: ETHANE |
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Electron microscopy imaging
Microscopy | Model: JEOL CRYO ARM 300 |
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Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD / Nominal defocus max: 1600 nm / Nominal defocus min: 800 nm |
Image recording | Electron dose: 50 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) |
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Processing
Software | Name: PHENIX / Version: 1.20.1_4487: / Classification: refinement | ||||||||||||||||||||||||
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CTF correction | Type: NONE | ||||||||||||||||||||||||
3D reconstruction | Resolution: 3.14 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 102741 / Symmetry type: POINT | ||||||||||||||||||||||||
Refine LS restraints |
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