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- PDB-7vde: 3.6 A structure of the human hemoglobin -

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Basic information

Entry
Database: PDB / ID: 7vde
Title3.6 A structure of the human hemoglobin
Components
  • Hemoglobin subunit alpha
  • Hemoglobin subunit beta
KeywordsSTRUCTURAL PROTEIN / Human hemoglobin
Function / homology
Function and homology information


nitric oxide transport / hemoglobin alpha binding / cellular oxidant detoxification / hemoglobin binding / haptoglobin-hemoglobin complex / renal absorption / organic acid binding / hemoglobin complex / oxygen transport / Scavenging of heme from plasma ...nitric oxide transport / hemoglobin alpha binding / cellular oxidant detoxification / hemoglobin 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 / carbon dioxide transport / Late endosomal microautophagy / Heme signaling / Erythrocytes take up oxygen and release carbon dioxide / Erythrocytes take up carbon dioxide and release oxygen / response to hydrogen peroxide / Cytoprotection by HMOX1 / platelet aggregation / oxygen binding / regulation of blood pressure / Chaperone Mediated Autophagy / positive regulation of nitric oxide biosynthetic process / tertiary granule lumen / Factors involved in megakaryocyte development and platelet production / blood microparticle / ficolin-1-rich granule lumen / iron ion binding / heme binding / Neutrophil degranulation / extracellular space / extracellular exosome / extracellular region / membrane / metal ion binding / cytosol
Similarity search - Function
Hemoglobin, pi / Hemoglobin, alpha-type / Hemoglobin, beta-type / : / Globin/Protoglobin / Globin domain profile. / Globin / Globin / Globin-like superfamily
Similarity search - Domain/homology
PROTOPORPHYRIN IX CONTAINING FE / Hemoglobin subunit beta / Hemoglobin subunit alpha
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.6 Å
AuthorsFan, H.C. / Zhang, Y. / Sun, F.
Funding support China, 5items
OrganizationGrant numberCountry
Ministry of Science and Technology (MoST, China)2017YFA0504700 China
National Natural Science Foundation of China (NSFC)31830020 China
Chinese Academy of SciencesXDB37040102 China
National Natural Science Foundation of China (NSFC)31925026 China
Ministry of Science and Technology (MoST, China)2015DFG32140 China
CitationJournal: Nat Commun / Year: 2021
Title: A cryo-electron microscopy support film formed by 2D crystals of hydrophobin HFBI.
Authors: Hongcheng Fan / Bo Wang / Yan Zhang / Yun Zhu / Bo Song / Haijin Xu / Yujia Zhai / Mingqiang Qiao / Fei Sun /
Abstract: Cryo-electron microscopy (cryo-EM) has become a powerful tool to resolve high-resolution structures of biomacromolecules in solution. However, air-water interface induced preferred orientations, ...Cryo-electron microscopy (cryo-EM) has become a powerful tool to resolve high-resolution structures of biomacromolecules in solution. However, air-water interface induced preferred orientations, dissociation or denaturation of biomacromolecules during cryo-vitrification remains a limiting factor for many specimens. To solve this bottleneck, we developed a cryo-EM support film using 2D crystals of hydrophobin HFBI. The hydrophilic side of the HFBI film adsorbs protein particles via electrostatic interactions and sequesters them from the air-water interface, allowing the formation of sufficiently thin ice for high-quality data collection. The particle orientation distribution can be regulated by adjusting the buffer pH. Using this support, we determined the cryo-EM structures of catalase (2.29 Å) and influenza haemagglutinin trimer (2.56 Å), which exhibited strong preferred orientations using a conventional cryo-vitrification protocol. We further show that the HFBI film is suitable to obtain high-resolution structures of small proteins, including aldolase (150 kDa, 3.28 Å) and haemoglobin (64 kDa, 3.6 Å). Our work suggests that HFBI films may have broad future applications in increasing the success rate and efficiency of cryo-EM.
History
DepositionSep 6, 2021Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Dec 29, 2021Provider: repository / Type: Initial release
Revision 1.1Jan 19, 2022Group: Database references / Category: pdbx_database_related / Item: _pdbx_database_related.details
Revision 1.2Jun 19, 2024Group: Data collection / Refinement description / Category: chem_comp_atom / chem_comp_bond / refine / Item: _refine.ls_d_res_high

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Assembly

Deposited unit
A: Hemoglobin subunit alpha
B: Hemoglobin subunit beta
C: Hemoglobin subunit alpha
D: Hemoglobin subunit beta
hetero molecules


Theoretical massNumber of molelcules
Total (without water)65,0728
Polymers62,6064
Non-polymers2,4664
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: microscopy
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area10100 Å2
ΔGint-101 kcal/mol
Surface area27310 Å2

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Components

#1: Protein Hemoglobin subunit alpha / Alpha-globin / Hemoglobin alpha chain


Mass: 15281.550 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: P69905
#2: Protein Hemoglobin subunit beta / Beta-globin / Hemoglobin beta chain


Mass: 16021.396 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: P68871
#3: Chemical
ChemComp-HEM / PROTOPORPHYRIN IX CONTAINING FE / HEME


Mass: 616.487 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: C34H32FeN4O4 / Feature type: SUBJECT OF INVESTIGATION
Has ligand of interestY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: Human hemoglobin / Type: COMPLEX / Entity ID: #1-#2 / Source: NATURAL
Molecular weightValue: 0.064 MDa / Experimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Escherichia coli 'BL21-Gold(DE3)pLysS AG' (bacteria)
Buffer solutionpH: 7.5
Buffer componentFormula: PBS
SpecimenConc.: 6.3 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: NICKEL/TITANIUM / Grid mesh size: 300 divisions/in.
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Talos Arctica / Image courtesy: FEI Company
MicroscopyModel: FEI TALOS ARCTICA
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 200 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal magnification: 215000 X
Image recordingElectron dose: 70 e/Å2 / Detector mode: SUPER-RESOLUTION / Film or detector model: GATAN K2 QUANTUM (4k x 4k) / Num. of real images: 2766
Image scansMovie frames/image: 45

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Processing

SoftwareName: PHENIX / Version: dev_4206: / Classification: refinement
EM software
IDNameVersionCategory
1Topazparticle selection
2SerialEMimage acquisition
4Gctf1.06CTF correction
10RELION3.1initial Euler assignment
11RELION3.1final Euler assignment
12RELION3.1classification
13RELION3.13D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 874836
SymmetryPoint symmetry: C2 (2 fold cyclic)
3D reconstructionResolution: 3.6 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 58828 / Algorithm: FOURIER SPACE / Symmetry type: POINT
RefinementHighest resolution: 3.6 Å
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0034699
ELECTRON MICROSCOPYf_angle_d0.6156449
ELECTRON MICROSCOPYf_dihedral_angle_d9.586630
ELECTRON MICROSCOPYf_chiral_restr0.037700
ELECTRON MICROSCOPYf_plane_restr0.005806

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