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- PDB-5ni1: CryoEM structure of haemoglobin at 3.2 A determined with the Volt... -
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Open data
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Basic information
Entry | Database: PDB / ID: 5ni1 | |||||||||
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Title | CryoEM structure of haemoglobin at 3.2 A determined with the Volta phase plate | |||||||||
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![]() | OXYGEN TRANSPORT / Volta phase plate / Single particle analysis / Hemoglobin | |||||||||
Function / homology | ![]() nitric oxide transport / hemoglobin binding / hemoglobin alpha binding / haptoglobin binding / haptoglobin-hemoglobin complex / renal absorption / organic acid binding / hemoglobin complex / oxygen transport / Scavenging of heme from plasma ...nitric oxide transport / hemoglobin binding / hemoglobin alpha binding / haptoglobin binding / haptoglobin-hemoglobin complex / renal absorption / organic acid binding / hemoglobin complex / oxygen transport / Scavenging of heme from plasma / endocytic vesicle lumen / blood vessel diameter maintenance / hydrogen peroxide catabolic process / oxygen carrier activity / Late endosomal microautophagy / Heme signaling / carbon dioxide transport / response to hydrogen peroxide / Erythrocytes take up oxygen and release carbon dioxide / Erythrocytes take up carbon dioxide and release oxygen / Cytoprotection by HMOX1 / oxygen binding / regulation of blood pressure / platelet aggregation / Chaperone Mediated Autophagy / peroxidase activity / positive regulation of nitric oxide biosynthetic process / tertiary granule lumen / Factors involved in megakaryocyte development and platelet production / ficolin-1-rich granule lumen / blood microparticle / iron ion binding / heme binding / Neutrophil degranulation / extracellular space / extracellular exosome / extracellular region / membrane / metal ion binding / cytosol Similarity search - Function | |||||||||
Biological species | ![]() | |||||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.2 Å | |||||||||
![]() | Khoshouei, M. / Radjainia, M. / Bunker, R. / Baumeister, W. / Danev, R. | |||||||||
![]() | ![]() Title: Cryo-EM structure of haemoglobin at 3.2 Å determined with the Volta phase plate. Authors: Maryam Khoshouei / Mazdak Radjainia / Wolfgang Baumeister / Radostin Danev / ![]() ![]() Abstract: With the advent of direct electron detectors, the perspectives of cryo-electron microscopy (cryo-EM) have changed in a profound way. These cameras are superior to previous detectors in coping with ...With the advent of direct electron detectors, the perspectives of cryo-electron microscopy (cryo-EM) have changed in a profound way. These cameras are superior to previous detectors in coping with the intrinsically low contrast and beam-induced motion of radiation-sensitive organic materials embedded in amorphous ice, and hence they have enabled the structure determination of many macromolecular assemblies to atomic or near-atomic resolution. Nevertheless, there are still limitations and one of them is the size of the target structure. Here, we report the use of a Volta phase plate in determining the structure of human haemoglobin (64 kDa) at 3.2 Å. Our results demonstrate that this method can be applied to complexes that are significantly smaller than those previously studied by conventional defocus-based approaches. Cryo-EM is now close to becoming a fast and cost-effective alternative to crystallography for high-resolution protein structure determination. #1: ![]() Title: Cryo-EM single particle analysis with the Volta phase plate. Authors: Radostin Danev / Wolfgang Baumeister / ![]() Abstract: We present a method for in-focus data acquisition with a phase plate that enables near-atomic resolution single particle reconstructions. Accurate focusing is the determining factor for obtaining ...We present a method for in-focus data acquisition with a phase plate that enables near-atomic resolution single particle reconstructions. Accurate focusing is the determining factor for obtaining high quality data. A double-area focusing strategy was implemented in order to achieve the required precision. With this approach we obtained a 3.2 Å resolution reconstruction of the Thermoplasma acidophilum 20S proteasome. The phase plate matches or slightly exceeds the performance of the conventional defocus approach. Spherical aberration becomes a limiting factor for achieving resolutions below 3 Å with in-focus phase plate images. The phase plate could enable single particle analysis of challenging samples in terms of small size, heterogeneity and flexibility that are difficult to solve by the conventional defocus approach. | |||||||||
History |
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Structure visualization
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Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 123.2 KB | Display | ![]() |
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PDB format | ![]() | 96.3 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Summary document | ![]() | 1.1 MB | Display | ![]() |
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Full document | ![]() | 1.1 MB | Display | |
Data in XML | ![]() | 26 KB | Display | |
Data in CIF | ![]() | 34.8 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 3488MC ![]() 3650C ![]() 3651C M: map data used to model this data C: citing same article ( |
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Similar structure data | |
EM raw data | ![]() Data size: 237.1 Data #1: Unaligned Volta phase plate multi-frame micrographs of human haemoglobin [micrographs - multiframe]) |
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Links
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Assembly
Deposited unit | ![]()
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Noncrystallographic symmetry (NCS) | NCS domain:
NCS domain segments: Component-ID: 1 / Beg auth comp-ID: VAL / Beg label comp-ID: VAL / Refine code: 1
NCS ensembles :
NCS oper:
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Components
#1: Protein | Mass: 15150.353 Da / Num. of mol.: 2 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() #2: Protein | Mass: 15890.198 Da / Num. of mol.: 2 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() #3: Chemical | ChemComp-HEM / #4: Water | ChemComp-HOH / | |
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-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: Hemoglobin / Type: COMPLEX / Entity ID: #1-#3 / Source: NATURAL |
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Source (natural) | Organism: ![]() |
Buffer solution | pH: 7.4 |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Vitrification | Cryogen name: ETHANE-PROPANE / Humidity: 100 % |
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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 |
Image recording | Electron dose: 40 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k) |
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Processing
Software | Name: REFMAC / Version: 5.8.0158 / Classification: refinement | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
3D reconstruction | Resolution: 3.2 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 175300 / Symmetry type: POINT | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Refinement | Resolution: 3.2→105 Å / Cor.coef. Fo:Fc: 0.574 / SU B: 18.168 / SU ML: 0.278 / ESU R: 0.34 Stereochemistry target values: MAXIMUM LIKELIHOOD WITH PHASES Details: HYDROGENS HAVE BEEN ADDED IN THE RIDING POSITIONS
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Solvent computation | Solvent model: PARAMETERS FOR MASK CACLULATION | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Displacement parameters | Biso mean: 60.032 Å2
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Refinement step | Cycle: 1 / Total: 4580 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Refine LS restraints |
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