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- PDB-8fpg: GluA2 flip Q isoform of AMPA receptor in complex with gain-of-fun... -
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Open data
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Basic information
Entry | Database: PDB / ID: 8fpg | ||||||
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Title | GluA2 flip Q isoform of AMPA receptor in complex with gain-of-function TARP gamma-2, with 10mM CaCl2, 150mM NaCl, 1mM MgCl2, 330uM CTZ, and 100uM CNQX (Closed-CaNaMg) | ||||||
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Function / homology | ![]() Presynaptic depolarization and calcium channel opening / LGI-ADAM interactions / ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Similarity search - Function | ||||||
Biological species | ![]() ![]() ![]() ![]() ![]() ![]() | ||||||
Method | ![]() ![]() ![]() | ||||||
![]() | Nakagawa, T. | ||||||
Funding support | ![]()
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![]() | ![]() Title: The open gate of the AMPA receptor forms a Ca binding site critical in regulating ion transport. Authors: Terunaga Nakagawa / Xin-Tong Wang / Federico J Miguez-Cabello / Derek Bowie / ![]() ![]() Abstract: Alpha-amino-3-hydroxyl-5-methyl-4-isoxazole-propionic acid receptors (AMPARs) are cation-selective ion channels that mediate most fast excitatory neurotransmission in the brain. Although their gating ...Alpha-amino-3-hydroxyl-5-methyl-4-isoxazole-propionic acid receptors (AMPARs) are cation-selective ion channels that mediate most fast excitatory neurotransmission in the brain. Although their gating mechanism has been studied extensively, understanding how cations traverse the pore has remained elusive. Here we investigated putative ion and water densities in the open pore of Ca-permeable AMPARs (rat GRIA2 flip-Q isoform) at 2.3-2.6 Å resolution. We show that the ion permeation pathway attains an extracellular Ca binding site (site-G) when the channel gate moves into the open configuration. Site-G is highly selective for Ca over Na, favoring the movement of Ca into the selectivity filter of the pore. Seizure-related N619K mutation, adjacent to site-G, promotes channel opening but attenuates Ca binding and thus diminishes Ca permeability. Our work identifies the importance of site-G, which coordinates with the Q/R site of the selectivity filter to ensure the preferential transport of Ca through the channel pore. | ||||||
History |
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 331.1 KB | Display | ![]() |
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PDB format | ![]() | 230.6 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Arichive directory | ![]() ![]() | HTTPS FTP |
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-Related structure data
Related structure data | ![]() 29363MC ![]() 8fp4C ![]() 8fp9C ![]() 8fpcC ![]() 8fphC ![]() 8fpkC ![]() 8fplC ![]() 8fpsC ![]() 8fpvC ![]() 8fpyC ![]() 8fpzC ![]() 8fq1C ![]() 8fq2C ![]() 8fq3C ![]() 8fq5C ![]() 8fq6C ![]() 8fq8C ![]() 8fqaC ![]() 8fqbC ![]() 8fqdC ![]() 8fqeC ![]() 8fqfC ![]() 8fqgC ![]() 8fqhC ![]() 8fr0C 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: 37109.809 Da / Num. of mol.: 4 / Mutation: K52E, K53E Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() ![]() ![]() #2: Protein | ![]() Mass: 99559.461 Da / Num. of mol.: 4 / Mutation: FLAG epitope tag (DYKDDDDK) insertion Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() ![]() ![]() #3: Chemical | ChemComp-CL / ![]() #4: Water | ChemComp-HOH / | ![]() Has ligand of interest | Y | |
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-Experimental details
-Experiment
Experiment | Method: ![]() |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: ![]() |
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Sample preparation
Component | Name: GluA2 flip-Q isoform in complex with TARP gamma2 (K52E, K53E) Type: COMPLEX / Entity ID: #1-#2 / Source: MULTIPLE SOURCES | ||||||||||||||||||||||||||||||
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Molecular weight | Value: 0.5 MDa / Experimental value: NO | ||||||||||||||||||||||||||||||
Source (natural) | Organism: ![]() ![]() ![]() | ||||||||||||||||||||||||||||||
Source (recombinant) | Organism: ![]() ![]() | ||||||||||||||||||||||||||||||
Buffer solution | pH: 8 Details: 6-cyano-7-nitroquinoxaline-2,3-dione (CNQX, 0.1 mM) and cyclothiazide (CTZ, 0.33 mM) were added before freezing. | ||||||||||||||||||||||||||||||
Buffer component |
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Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied![]() ![]() | ||||||||||||||||||||||||||||||
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: TFS KRIOS |
Electron gun | Electron source![]() ![]() |
Electron lens | Mode: BRIGHT FIELD![]() |
Specimen holder | Cryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER |
Image recording | Electron dose: 56 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Num. of grids imaged: 1 / Num. of real images: 34553 |
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Processing
EM software |
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CTF correction![]() | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||||||||
Symmetry | Point symmetry![]() ![]() | ||||||||||||||||||||||||||||||
3D reconstruction![]() | Resolution: 2.32 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 847436 / Algorithm: FOURIER SPACE / Symmetry type: POINT | ||||||||||||||||||||||||||||||
Refine LS restraints |
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