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Open data
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Basic information
Entry | Database: PDB / ID: 7d9z | |||||||||||||||||||||
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Title | Crystal structure of anti-basigin Fab fragment | |||||||||||||||||||||
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![]() | IMMUNE SYSTEM / Fab / antibody / basigin | |||||||||||||||||||||
Function / homology | CITRATE ANION![]() | |||||||||||||||||||||
Biological species | ![]() ![]() | |||||||||||||||||||||
Method | ![]() ![]() ![]() | |||||||||||||||||||||
![]() | Sakuragi, T. / Kanai, R. / Narita, H. / Onishi, E. / Miyazaki, T. / Baba, T. / Nakagawa, A. / Toyoshima, C. / Nagata, S. | |||||||||||||||||||||
Funding support | ![]()
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![]() | ![]() Title: The tertiary structure of the human Xkr8-Basigin complex that scrambles phospholipids at plasma membranes. Authors: Takaharu Sakuragi / Ryuta Kanai / Akihisa Tsutsumi / Hirotaka Narita / Eriko Onishi / Kohei Nishino / Takuya Miyazaki / Takeshi Baba / Hidetaka Kosako / Atsushi Nakagawa / Masahide Kikkawa / ...Authors: Takaharu Sakuragi / Ryuta Kanai / Akihisa Tsutsumi / Hirotaka Narita / Eriko Onishi / Kohei Nishino / Takuya Miyazaki / Takeshi Baba / Hidetaka Kosako / Atsushi Nakagawa / Masahide Kikkawa / Chikashi Toyoshima / Shigekazu Nagata / ![]() Abstract: Xkr8-Basigin is a plasma membrane phospholipid scramblase activated by kinases or caspases. We combined cryo-EM and X-ray crystallography to investigate its structure at an overall resolution of 3. ...Xkr8-Basigin is a plasma membrane phospholipid scramblase activated by kinases or caspases. We combined cryo-EM and X-ray crystallography to investigate its structure at an overall resolution of 3.8 Å. Its membrane-spanning region carrying 22 charged amino acids adopts a cuboid-like structure stabilized by salt bridges between hydrophilic residues in transmembrane helices. Phosphatidylcholine binding was observed in a hydrophobic cleft on the surface exposed to the outer leaflet of the plasma membrane. Six charged residues placed from top to bottom inside the molecule were essential for scrambling phospholipids in inward and outward directions, apparently providing a pathway for their translocation. A tryptophan residue was present between the head group of phosphatidylcholine and the extracellular end of the path. Its mutation to alanine made the Xkr8-Basigin complex constitutively active, indicating that it plays a vital role in regulating its scramblase activity. The structure of Xkr8-Basigin provides insights into the molecular mechanisms underlying phospholipid scrambling. | |||||||||||||||||||||
History |
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 345.4 KB | Display | ![]() |
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PDB format | ![]() | 236.1 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Summary document | ![]() | 459.7 KB | Display | ![]() |
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Full document | ![]() | 460.5 KB | Display | |
Data in XML | ![]() | 25 KB | Display | |
Data in CIF | ![]() | 39.7 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 7daaC ![]() 7dceC ![]() 4ma3S S: Starting model for refinement C: citing same article ( |
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Similar structure data |
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Links
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Assembly
Deposited unit | ![]()
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Unit cell |
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Components
#1: Antibody | Mass: 23319.902 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() | ||||||
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#2: Antibody | Mass: 22786.523 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() | ||||||
#3: Chemical | ChemComp-EDO / #4: Chemical | ChemComp-FLC / | #5: Water | ChemComp-HOH / | Has ligand of interest | N | |
-Experimental details
-Experiment
Experiment | Method: ![]() |
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Sample preparation
Crystal | Density Matthews: 2.47 Å3/Da / Density % sol: 50.12 % |
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Crystal grow | Temperature: 293.15 K / Method: vapor diffusion, sitting drop Details: 0.1% n-Octyl-beta-D-glucoside, 0.1M sodium citrate tribasic dihydrate, 22% PEG 3350 |
-Data collection
Diffraction | Mean temperature: 100 K / Serial crystal experiment: N |
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Diffraction source | Source: ![]() ![]() ![]() |
Detector | Type: DECTRIS EIGER X 9M / Detector: PIXEL / Date: Jun 9, 2018 |
Radiation | Protocol: SINGLE WAVELENGTH / Monochromatic (M) / Laue (L): M / Scattering type: x-ray |
Radiation wavelength | Wavelength: 1 Å / Relative weight: 1 |
Reflection | Resolution: 1.123→78.924 Å / Num. obs: 139276 / % possible obs: 81.6 % / Redundancy: 4.8 % / Biso Wilson estimate: 13.35 Å2 / CC1/2: 0.999 / Net I/σ(I): 13.5 |
Reflection shell | Resolution: 1.123→1.194 Å / Num. unique obs: 6905 / CC1/2: 0.575 |
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Processing
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Refinement | Method to determine structure: ![]() Starting model: 4ma3 Resolution: 1.123→36.4 Å / SU ML: 0.0836 / Cross valid method: FREE R-VALUE / σ(F): 1.37 / Phase error: 15.0715 Stereochemistry target values: GeoStd + Monomer Library + CDL v1.2
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Solvent computation | Shrinkage radii: 0.9 Å / VDW probe radii: 1.11 Å / Solvent model: FLAT BULK SOLVENT MODEL | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Displacement parameters | Biso mean: 19.68 Å2 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Refinement step | Cycle: LAST / Resolution: 1.123→36.4 Å
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Refine LS restraints |
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LS refinement shell |
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