+Open data
-Basic information
Entry | Database: PDB / ID: 7xgy | ||||||
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Title | cryo-EM structure of hemoglobin | ||||||
Components |
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Keywords | OXYGEN TRANSPORT / tetramer | ||||||
Function / homology | Function and homology information nitric oxide transport / cellular oxidant detoxification / hemoglobin binding / hemoglobin alpha binding / haptoglobin-hemoglobin complex / organic acid binding / renal absorption / hemoglobin complex / oxygen transport / Scavenging of heme from plasma ...nitric oxide transport / cellular oxidant detoxification / hemoglobin binding / hemoglobin alpha binding / haptoglobin-hemoglobin complex / organic acid binding / renal absorption / hemoglobin complex / oxygen transport / Scavenging of heme from plasma / endocytic vesicle lumen / blood vessel diameter maintenance / hydrogen peroxide catabolic process / oxygen carrier activity / regulation of blood pressure / Late endosomal microautophagy / Heme signaling / carbon dioxide transport / Erythrocytes take up oxygen and release carbon dioxide / response to hydrogen peroxide / Erythrocytes take up carbon dioxide and release oxygen / Cytoprotection by HMOX1 / platelet aggregation / oxygen binding / Chaperone Mediated Autophagy / positive regulation of nitric oxide biosynthetic process / Factors involved in megakaryocyte development and platelet production / tertiary granule lumen / 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 | Homo sapiens (human) | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.5 Å | ||||||
Authors | Liu, N. / Wang, H.W. | ||||||
Funding support | 1items
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Citation | Journal: Nat Methods / Year: 2023 Title: Uniform thin ice on ultraflat graphene for high-resolution cryo-EM. Authors: Liming Zheng / Nan Liu / Xiaoyin Gao / Wenqing Zhu / Kun Liu / Cang Wu / Rui Yan / Jincan Zhang / Xin Gao / Yating Yao / Bing Deng / Jie Xu / Ye Lu / Zhongmin Liu / Mengsen Li / Xiaoding Wei ...Authors: Liming Zheng / Nan Liu / Xiaoyin Gao / Wenqing Zhu / Kun Liu / Cang Wu / Rui Yan / Jincan Zhang / Xin Gao / Yating Yao / Bing Deng / Jie Xu / Ye Lu / Zhongmin Liu / Mengsen Li / Xiaoding Wei / Hong-Wei Wang / Hailin Peng / Abstract: Cryo-electron microscopy (cryo-EM) visualizes the atomic structure of macromolecules that are embedded in vitrified thin ice at their close-to-native state. However, the homogeneity of ice thickness, ...Cryo-electron microscopy (cryo-EM) visualizes the atomic structure of macromolecules that are embedded in vitrified thin ice at their close-to-native state. However, the homogeneity of ice thickness, a key factor to ensure high image quality, is poorly controlled during specimen preparation and has become one of the main challenges for high-resolution cryo-EM. Here we found that the uniformity of thin ice relies on the surface flatness of the supporting film, and developed a method to use ultraflat graphene (UFG) as the support for cryo-EM specimen preparation to achieve better control of vitreous ice thickness. We show that the uniform thin ice on UFG improves the image quality of vitrified specimens. Using such a method we successfully determined the three-dimensional structures of hemoglobin (64 kDa), α-fetoprotein (67 kDa) with no symmetry, and streptavidin (52 kDa) at a resolution of 3.5 Å, 2.6 Å and 2.2 Å, respectively. Furthermore, our results demonstrate the potential of UFG for the fields of cryo-electron tomography and structure-based drug discovery. | ||||||
History |
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-Structure visualization
Structure viewer | Molecule: MolmilJmol/JSmol |
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-Downloads & links
-Download
PDBx/mmCIF format | 7xgy.cif.gz | 108.7 KB | Display | PDBx/mmCIF format |
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PDB format | pdb7xgy.ent.gz | 85.2 KB | Display | PDB format |
PDBx/mmJSON format | 7xgy.json.gz | Tree view | PDBx/mmJSON format | |
Others | Other downloads |
-Validation report
Summary document | 7xgy_validation.pdf.gz | 1.4 MB | Display | wwPDB validaton report |
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Full document | 7xgy_full_validation.pdf.gz | 1.4 MB | Display | |
Data in XML | 7xgy_validation.xml.gz | 30.8 KB | Display | |
Data in CIF | 7xgy_validation.cif.gz | 39.9 KB | Display | |
Arichive directory | https://data.pdbj.org/pub/pdb/validation_reports/xg/7xgy ftp://data.pdbj.org/pub/pdb/validation_reports/xg/7xgy | HTTPS FTP |
-Related structure data
Related structure data | 33189MC 7yimC 8gvkC M: map data used to model this data C: citing same article (ref.) |
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Similar structure data | Similarity search - Function & homologyF&H Search |
-Links
-Assembly
Deposited unit |
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1 |
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-Components
#1: Protein | Mass: 15281.550 Da / Num. of mol.: 2 Source method: isolated from a genetically manipulated source Source: (gene. exp.) Homo sapiens (human) / Gene: HBA1, HBA2 / Production host: Homo sapiens (human) / References: UniProt: P69905 #2: Protein | Mass: 16021.396 Da / Num. of mol.: 2 Source method: isolated from a genetically manipulated source Source: (gene. exp.) Homo sapiens (human) / Gene: HBB / Production host: Homo sapiens (human) / References: UniProt: P68871 #3: Chemical | ChemComp-HEM / Has ligand of interest | N | |
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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 |
-Sample preparation
Component | Name: hemoglobin / Type: COMPLEX / Entity ID: #1-#2 / Source: NATURAL |
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Source (natural) | Organism: Homo sapiens (human) |
Buffer solution | pH: 7.5 |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Vitrification | Cryogen name: ETHANE |
-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: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM |
Electron lens | Mode: BRIGHT FIELD / Nominal defocus max: 2000 nm / Nominal defocus min: 600 nm |
Image recording | Electron dose: 50 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) |
-Processing
CTF correction | Type: PHASE FLIPPING ONLY |
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3D reconstruction | Resolution: 3.5 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 105000 / Algorithm: FOURIER SPACE / Symmetry type: POINT |