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- PDB-8xej: Cryo-EM structure of human XKR8-basigin complex in lipid nanodisc -
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Open data
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Basic information
Entry | Database: PDB / ID: 8xej | ||||||||||||
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Title | Cryo-EM structure of human XKR8-basigin complex in lipid nanodisc | ||||||||||||
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![]() | LIPID TRANSPORT / scramblase / apoptosis / membrane protein | ||||||||||||
Function / homology | ![]() Defective SLC16A1 causes symptomatic deficiency in lactate transport (SDLT) / Proton-coupled monocarboxylate transport / phosphatidylserine exposure on apoptotic cell surface / tolerance induction to self antigen / positive regulation of matrix metallopeptidase secretion / acrosomal membrane / phospholipid scramblase activity / neutrophil clearance / response to mercury ion / engulfment of apoptotic cell ...Defective SLC16A1 causes symptomatic deficiency in lactate transport (SDLT) / Proton-coupled monocarboxylate transport / phosphatidylserine exposure on apoptotic cell surface / tolerance induction to self antigen / positive regulation of matrix metallopeptidase secretion / acrosomal membrane / phospholipid scramblase activity / neutrophil clearance / response to mercury ion / engulfment of apoptotic cell / endothelial tube morphogenesis / neural retina development / apoptotic process involved in development / photoreceptor cell maintenance / Basigin interactions / Aspirin ADME / odontogenesis of dentin-containing tooth / D-mannose binding / decidualization / photoreceptor outer segment / positive regulation of vascular endothelial growth factor production / Integrin cell surface interactions / positive regulation of myoblast differentiation / response to cAMP / neutrophil chemotaxis / embryo implantation / Degradation of the extracellular matrix / positive regulation of endothelial cell migration / photoreceptor inner segment / protein localization to plasma membrane / establishment of localization in cell / sarcolemma / response to peptide hormone / positive regulation of interleukin-6 production / virus receptor activity / melanosome / signaling receptor activity / basolateral plasma membrane / angiogenesis / endosome / cell surface receptor signaling pathway / positive regulation of viral entry into host cell / cadherin binding / Golgi membrane / intracellular membrane-bounded organelle / focal adhesion / endoplasmic reticulum membrane / perinuclear region of cytoplasm / mitochondrion / extracellular exosome / membrane / plasma membrane Similarity search - Function | ||||||||||||
Biological species | ![]() ![]() ![]() | ||||||||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.66 Å | ||||||||||||
![]() | Sakuragi, T.S. / Kanai, R.K. / Kikkawa, M.K. / Toyoshima, C.T. / Nagata, S.N. | ||||||||||||
Funding support | ![]()
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![]() | ![]() Title: The role of the C-terminal tail region as a plug to regulate XKR8 lipid scramblase. Authors: Takaharu Sakuragi / Ryuta Kanai / Mayumi Otani / Masahide Kikkawa / Chikashi Toyoshima / Shigekazu Nagata / ![]() Abstract: XK-related 8 (XKR8), in complex with the transmembrane glycoprotein basigin, functions as a phospholipid scramblase activated by the caspase-mediated cleavage or phosphorylation of its C-terminal ...XK-related 8 (XKR8), in complex with the transmembrane glycoprotein basigin, functions as a phospholipid scramblase activated by the caspase-mediated cleavage or phosphorylation of its C-terminal tail. It carries a putative phospholipid translocation path of multiple hydrophobic and charged residues in the transmembrane region. It also has a crucial tryptophan at the exoplasmic end of the path that regulates its scrambling activity. We herein investigated the tertiary structure of the human XKR8-basigin complex embedded in lipid nanodiscs at an overall resolution of 3.66 Å. We found that the C-terminal tail engaged in intricate polar and van der Waals interactions with a groove at the cytoplasmic surface of XKR8. These interactions maintained the inactive state of XKR8. Point mutations to disrupt these interactions strongly enhanced the scrambling activity of XKR8, suggesting that the activation of XKR8 is mediated by releasing the C-terminal tail from the cytoplasmic groove. We speculate that the cytoplasmic tail region of XKR8 functions as a plug to prevent the scrambling of phospholipids. | ||||||||||||
History |
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 174 KB | Display | ![]() |
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PDB format | ![]() | 133.8 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Summary document | ![]() | 1.2 MB | Display | ![]() |
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Full document | ![]() | 1.2 MB | Display | |
Data in XML | ![]() | 36.5 KB | Display | |
Data in CIF | ![]() | 53.4 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 38291MC 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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Components
#1: Protein | Mass: 19592.814 Da / Num. of mol.: 1 / Mutation: N152Q, N186Q Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() |
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#2: Protein | Mass: 45975.609 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() |
#3: Antibody | Mass: 22869.639 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() |
#4: Antibody | Mass: 23261.865 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() |
#5: Chemical | ChemComp-DLP / |
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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Molecular weight | Value: 0.11 MDa / Experimental value: NO | ||||||||||||||||||||||||
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Source (recombinant) |
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Buffer solution | pH: 7 | ||||||||||||||||||||||||
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES | ||||||||||||||||||||||||
Vitrification | Cryogen name: ETHANE |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: FEI TITAN KRIOS |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD / Nominal defocus max: 1800 nm / Nominal defocus min: 1000 nm |
Image recording | Electron dose: 50 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) |
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Processing
CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
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3D reconstruction | Resolution: 3.66 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 162528 / Symmetry type: POINT | ||||||||||||||||||||||||
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