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Open data
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Basic information
Entry | Database: PDB / ID: 7a4m | |||||||||||||||||||||
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Title | Cryo-EM structure of mouse heavy-chain apoferritin at 1.22 A | |||||||||||||||||||||
![]() | Ferritin heavy chain![]() | |||||||||||||||||||||
![]() | METAL BINDING PROTEIN / Iron storage | |||||||||||||||||||||
Function / homology | ![]() Iron uptake and transport / Golgi Associated Vesicle Biogenesis / iron ion sequestering activity / ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Similarity search - Function | |||||||||||||||||||||
Biological species | ![]() ![]() ![]() | |||||||||||||||||||||
Method | ![]() ![]() ![]() | |||||||||||||||||||||
![]() | Nakane, T. / Kotecha, A. / Sente, A. / Yamashita, K. / McMullan, G. / Masiulis, S. / Brown, P.M.G.E. / Grigoras, I.T. / Malinauskaite, L. / Malinauskas, T. ...Nakane, T. / Kotecha, A. / Sente, A. / Yamashita, K. / McMullan, G. / Masiulis, S. / Brown, P.M.G.E. / Grigoras, I.T. / Malinauskaite, L. / Malinauskas, T. / Miehling, J. / Yu, L. / Karia, D. / Pechnikova, E.V. / de Jong, E. / Keizer, J. / Bischoff, M. / McCormack, J. / Tiemeijer, P. / Hardwick, S.W. / Chirgadze, D.Y. / Murshudov, G. / Aricescu, A.R. / Scheres, S.H.W. | |||||||||||||||||||||
Funding support | ![]()
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![]() | ![]() Title: Single-particle cryo-EM at atomic resolution. Authors: Takanori Nakane / Abhay Kotecha / Andrija Sente / Greg McMullan / Simonas Masiulis / Patricia M G E Brown / Ioana T Grigoras / Lina Malinauskaite / Tomas Malinauskas / Jonas Miehling / ...Authors: Takanori Nakane / Abhay Kotecha / Andrija Sente / Greg McMullan / Simonas Masiulis / Patricia M G E Brown / Ioana T Grigoras / Lina Malinauskaite / Tomas Malinauskas / Jonas Miehling / Tomasz Uchański / Lingbo Yu / Dimple Karia / Evgeniya V Pechnikova / Erwin de Jong / Jeroen Keizer / Maarten Bischoff / Jamie McCormack / Peter Tiemeijer / Steven W Hardwick / Dimitri Y Chirgadze / Garib Murshudov / A Radu Aricescu / Sjors H W Scheres / ![]() ![]() ![]() Abstract: The three-dimensional positions of atoms in protein molecules define their structure and their roles in biological processes. The more precisely atomic coordinates are determined, the more chemical ...The three-dimensional positions of atoms in protein molecules define their structure and their roles in biological processes. The more precisely atomic coordinates are determined, the more chemical information can be derived and the more mechanistic insights into protein function may be inferred. Electron cryo-microscopy (cryo-EM) single-particle analysis has yielded protein structures with increasing levels of detail in recent years. However, it has proved difficult to obtain cryo-EM reconstructions with sufficient resolution to visualize individual atoms in proteins. Here we use a new electron source, energy filter and camera to obtain a 1.7 Å resolution cryo-EM reconstruction for a human membrane protein, the β3 GABA receptor homopentamer. Such maps allow a detailed understanding of small-molecule coordination, visualization of solvent molecules and alternative conformations for multiple amino acids, and unambiguous building of ordered acidic side chains and glycans. Applied to mouse apoferritin, our strategy led to a 1.22 Å resolution reconstruction that offers a genuine atomic-resolution view of a protein molecule using single-particle cryo-EM. Moreover, the scattering potential from many hydrogen atoms can be visualized in difference maps, allowing a direct analysis of hydrogen-bonding networks. Our technological advances, combined with further approaches to accelerate data acquisition and improve sample quality, provide a route towards routine application of cryo-EM in high-throughput screening of small molecule modulators and structure-based drug discovery. | |||||||||||||||||||||
History |
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Structure visualization
Movie |
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Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 160.6 KB | Display | ![]() |
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PDB format | ![]() | 129.1 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Arichive directory | ![]() ![]() | HTTPS FTP |
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-Related structure data
Related structure data | ![]() 11638MC ![]() 7a5vC M: map data used to model this data C: citing same article ( |
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Similar structure data | |
EM raw data | ![]() Data #1: Unaligned movies of apoferritin [micrographs - multiframe]) |
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Links
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Assembly
Deposited unit | ![]()
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Noncrystallographic symmetry (NCS) | NCS oper:
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Components
#1: Protein | ![]() Mass: 20079.594 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
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#2: Chemical | ChemComp-FE / ![]() |
#3: Chemical | ChemComp-ZN / |
#4: Water | ChemComp-HOH / ![]() |
Has ligand of interest | N |
-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: Mouse heavy-chain apoferritin / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT |
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Molecular weight | Value: 0.5 MDa / Experimental value: NO |
Source (natural) | Organism: ![]() ![]() ![]() |
Source (recombinant) | Organism: ![]() ![]() ![]() |
Buffer solution | pH: 7.5 / Details: 20mM HEPES pH 7.5 150mM NaCl |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied![]() ![]() |
Specimen support | Grid material: GOLD / Grid mesh size: 300 divisions/in. / Grid type: UltrAuFoil R1.2/1.3 |
Vitrification![]() | Instrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277 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![]() ![]() |
Specimen holder | Cryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER |
Image recording | Electron dose: 40 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k) |
Image scans | Width: 4096 / Height: 4096 |
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Processing
Software | Name: REFMAC / Version: 5.8.0272 / Classification: refinement | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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EM software |
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CTF correction![]() | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Symmetry | Point symmetry![]() ![]() | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
3D reconstruction![]() | Resolution: 1.22 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 363126 / Algorithm: FOURIER SPACE / Symmetry type: POINT | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Atomic model building | Protocol: AB INITIO MODEL / Space: RECIPROCAL | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Refinement | Resolution: 1.22→136.5 Å / Cor.coef. Fo:Fc: 0.845 / SU B: 1.487 / SU ML: 0.024 / ESU R: 0.006 Stereochemistry target values: MAXIMUM LIKELIHOOD WITH PHASES Details: HYDROGENS HAVE BEEN USED IF PRESENT IN THE INPUT
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Solvent computation | Solvent model: PARAMETERS FOR MASK CACLULATION | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Displacement parameters | Biso mean: 23.691 Å2
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Refinement step | Cycle: 1 / Total: 1668 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Refine LS restraints |
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