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Open data
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Basic information
Entry | Database: PDB / ID: 8ubz | ||||||
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Title | Choline-bound FLVCR1 | ||||||
![]() | Heme transporter FLVCR1 | ||||||
![]() | TRANSPORT PROTEIN / Choline / ethanolamine / membrane transport | ||||||
Function / homology | ![]() heme export / heme transport / heme transmembrane transporter activity / embryonic skeletal system morphogenesis / head morphogenesis / regulation of organ growth / Heme biosynthesis / heme biosynthetic process / embryonic digit morphogenesis / mitochondrial transport ...heme export / heme transport / heme transmembrane transporter activity / embryonic skeletal system morphogenesis / head morphogenesis / regulation of organ growth / Heme biosynthesis / heme biosynthetic process / embryonic digit morphogenesis / mitochondrial transport / blood vessel development / erythrocyte maturation / spleen development / erythrocyte differentiation / Iron uptake and transport / multicellular organism growth / intracellular iron ion homeostasis / in utero embryonic development / mitochondrial inner membrane / heme binding / mitochondrion / membrane / plasma membrane Similarity search - Function | ||||||
Biological species | ![]() | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.02 Å | ||||||
![]() | Hite, R.K. / Son, Y. | ||||||
Funding support | 1items
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![]() | ![]() Title: Structural basis of lipid head group entry to the Kennedy pathway by FLVCR1. Authors: Yeeun Son / Timothy C Kenny / Artem Khan / Kıvanç Birsoy / Richard K Hite / ![]() Abstract: Phosphatidylcholine and phosphatidylethanolamine, the two most abundant phospholipids in mammalian cells, are synthesized de novo by the Kennedy pathway from choline and ethanolamine, respectively. ...Phosphatidylcholine and phosphatidylethanolamine, the two most abundant phospholipids in mammalian cells, are synthesized de novo by the Kennedy pathway from choline and ethanolamine, respectively. Despite the essential roles of these lipids, the mechanisms that enable the cellular uptake of choline and ethanolamine remain unknown. Here we show that the protein encoded by FLVCR1, whose mutation leads to the neurodegenerative syndrome posterior column ataxia and retinitis pigmentosa, transports extracellular choline and ethanolamine into cells for phosphorylation by downstream kinases to initiate the Kennedy pathway. Structures of FLVCR1 in the presence of choline and ethanolamine reveal that both metabolites bind to a common binding site comprising aromatic and polar residues. Despite binding to a common site, FLVCR1 interacts in different ways with the larger quaternary amine of choline in and with the primary amine of ethanolamine. Structure-guided mutagenesis identified residues that are crucial for the transport of ethanolamine, but dispensable for choline transport, enabling functional separation of the entry points into the two branches of the Kennedy pathway. Altogether, these studies reveal how FLVCR1 is a high-affinity metabolite transporter that serves as the common origin for phospholipid biosynthesis by two branches of the Kennedy pathway. | ||||||
History |
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 170.7 KB | Display | ![]() |
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PDB format | ![]() | 137 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Arichive directory | ![]() ![]() | HTTPS FTP |
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-Related structure data
Related structure data | ![]() 42110MC ![]() 8ubwC ![]() 8ubxC ![]() 8ubyC ![]() 8uc0C 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: 59899.352 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() | ||||||
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#2: Chemical | #3: Chemical | ChemComp-CHT / | #4: Water | ChemComp-HOH / | 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
Component | Name: Human FLVCR1 / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT | ||||||||||||||||||||||||||||||
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Molecular weight | Experimental value: NO | ||||||||||||||||||||||||||||||
Source (natural) | Organism: ![]() | ||||||||||||||||||||||||||||||
Source (recombinant) | Organism: ![]() | ||||||||||||||||||||||||||||||
Buffer solution | pH: 7.5 Details: 0.01 % LMNG, 0.001 % CHS, 20 mM HEPES (pHed with KOH, pH 7.5), 150 mM KCl, 1 mM ethanol amine | ||||||||||||||||||||||||||||||
Buffer component |
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Specimen | Conc.: 6 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES | ||||||||||||||||||||||||||||||
Specimen support | Grid material: GOLD / Grid mesh size: 400 divisions/in. / Grid type: Quantifoil R1.2/1.3 | ||||||||||||||||||||||||||||||
Vitrification | Instrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 297 K |
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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: 1500 nm / Nominal defocus min: 500 nm |
Image recording | Electron dose: 66 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) |
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Processing
EM software |
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
Particle selection | Num. of particles selected: 5046088 | ||||||||||||||||||||||||
Symmetry | Point symmetry: C1 (asymmetric) | ||||||||||||||||||||||||
3D reconstruction | Resolution: 3.02 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 36781 / Symmetry type: POINT | ||||||||||||||||||||||||
Atomic model building | Protocol: BACKBONE TRACE / Space: REAL / Target criteria: FSC 0.5 | ||||||||||||||||||||||||
Refine LS restraints |
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