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- PDB-5xti: Cryo-EM architecture of human respiratory chain megacomplex-I2III2IV2 -
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Basic information
Entry | Database: PDB / ID: 5xti | ||||||||||||||||||
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Title | Cryo-EM architecture of human respiratory chain megacomplex-I2III2IV2 | ||||||||||||||||||
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![]() | OXIDOREDUCTASE/ELECTRON TRANSPORT / Homo sapiens / Oxidoreductase / Respiratory / OXIDOREDUCTASE-ELECTRON TRANSPORT complex | ||||||||||||||||||
Function / homology | ![]() Complex III assembly / Complex III assembly / Complex III assembly / Complex III assembly / Complex III assembly / response to D-galactosamine / Complex III assembly / Complex III assembly / Complex III assembly / Complex III assembly ...Complex III assembly / Complex III assembly / Complex III assembly / Complex III assembly / Complex III assembly / response to D-galactosamine / Complex III assembly / Complex III assembly / Complex III assembly / Complex III assembly / protein lipoylation / Complex IV assembly / Complex I biogenesis / TP53 Regulates Metabolic Genes / Mitochondrial Fatty Acid Beta-Oxidation / Protein lipoylation / Cytoprotection by HMOX1 / respiratory chain complex IV assembly / response to mercury ion / Respiratory electron transport / subthalamus development / pons development / protein insertion into mitochondrial inner membrane / mitochondrial respirasome assembly / response to cobalamin / cerebellar Purkinje cell layer development / blastocyst hatching / mitochondrial respiratory chain complex III assembly / ubiquinone biosynthetic process / response to alkaloid / pyramidal neuron development / Respiratory electron transport / cellular respiration / respiratory chain complex IV / thalamus development / Mitochondrial protein import / cellular response to oxygen levels / mesenchymal stem cell proliferation / respiratory chain complex / mitochondrial [2Fe-2S] assembly complex / reproductive system development / iron-sulfur cluster assembly complex / mitochondrial large ribosomal subunit binding / gliogenesis / cytochrome-c oxidase / mesenchymal stem cell differentiation / circulatory system development / regulation of protein phosphorylation / respiratory chain complex III / oxidoreductase activity, acting on NAD(P)H, quinone or similar compound as acceptor / negative regulation of non-canonical NF-kappaB signal transduction / oxidative phosphorylation / cardiac muscle tissue development / quinol-cytochrome-c reductase / neural precursor cell proliferation / response to glucagon / mitochondrial electron transport, cytochrome c to oxygen / positive regulation of mitochondrial membrane potential / [2Fe-2S] cluster assembly / oxygen sensor activity / quinol-cytochrome-c reductase activity / azurophil granule membrane / cytochrome-c oxidase activity / stem cell division / response to copper ion / sodium ion transport / NADH dehydrogenase activity / mitochondrial electron transport, ubiquinol to cytochrome c / iron-sulfur cluster assembly / Mitochondrial protein degradation / hypothalamus development / acyl binding / mitochondrial ATP synthesis coupled electron transport / midbrain development / ubiquinone binding / acyl carrier activity / electron transport coupled proton transport / NADH:ubiquinone reductase (H+-translocating) / positive regulation of ATP biosynthetic process / mitochondrial respiratory chain complex I assembly / mitochondrial electron transport, NADH to ubiquinone / proton motive force-driven mitochondrial ATP synthesis / RHOG GTPase cycle / positive regulation of execution phase of apoptosis / respiratory chain complex I / animal organ regeneration / response to hyperoxia / response to cAMP / NADH dehydrogenase (ubiquinone) activity / endopeptidase activator activity / response to cadmium ion / quinone binding / cellular response to interferon-beta / ATP synthesis coupled electron transport / extrinsic apoptotic signaling pathway / negative regulation of reactive oxygen species biosynthetic process / enzyme regulator activity / cellular response to retinoic acid / neurogenesis / ionotropic glutamate receptor binding Similarity search - Function | ||||||||||||||||||
Biological species | ![]() ![]() ![]() | ||||||||||||||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 17.4 Å | ||||||||||||||||||
![]() | Gu, J. / Wu, M. / Yang, M. | ||||||||||||||||||
Funding support | ![]()
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![]() | ![]() Title: Architecture of Human Mitochondrial Respiratory Megacomplex IIIIIV. Authors: Runyu Guo / Shuai Zong / Meng Wu / Jinke Gu / Maojun Yang / ![]() Abstract: The respiratory megacomplex represents the highest-order assembly of respiratory chain complexes, and it allows mitochondria to respond to energy-requiring conditions. To understand its architecture, ...The respiratory megacomplex represents the highest-order assembly of respiratory chain complexes, and it allows mitochondria to respond to energy-requiring conditions. To understand its architecture, we examined the human respiratory chain megacomplex-IIIIIV (MCIIIIIV) with 140 subunits and a subset of associated cofactors using cryo-electron microscopy. The MCIIIIIV forms a circular structure with the dimeric CIII located in the center, where it is surrounded by two copies each of CI and CIV. Two cytochrome c (Cyt.c) molecules are positioned to accept electrons on the surface of the c state CIII dimer. Analyses indicate that CII could insert into the gaps between CI and CIV to form a closed ring, which we termed the electron transport chain supercomplex. The structure not only reveals the precise assignment of individual subunits of human CI and CIII, but also enables future in-depth analysis of the electron transport chain as a whole. | ||||||||||||||||||
History |
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Structure visualization
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Structure viewer | Molecule: ![]() ![]() |
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PDBx/mmCIF format | ![]() | 4.4 MB | Display | ![]() |
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-Validation report
Summary document | ![]() | 4.2 MB | Display | ![]() |
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Full document | ![]() | 4.4 MB | Display | |
Data in XML | ![]() | 529.9 KB | Display | |
Data in CIF | ![]() | 871.4 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 6776MC ![]() 6771C ![]() 6772C ![]() 6773C ![]() 6774C ![]() 6775C ![]() 5xtbC ![]() 5xtcC ![]() 5xtdC ![]() 5xteC ![]() 5xthC M: map data used to model this data C: citing same article ( |
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Similar structure data |
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Links
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Assembly
Deposited unit | ![]()
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Components
+NADH dehydrogenase [ubiquinone] flavoprotein ... , 3 types, 6 molecules ABAKBKOBO
+NADH dehydrogenase [ubiquinone] iron-sulfur protein ... , 7 types, 14 molecules BBBCBCLBLPBPQBQTBThBh
+NADH dehydrogenase [ubiquinone] 1 alpha subcomplex subunit ... , 12 types, 24 molecules EBEFBFHBHIBIJBJNBNSBSUBUVBVWBWuBuwBw
+Protein , 4 types, 10 molecules GXBGBXMBMAHAUAJAV
+NADH dehydrogenase [ubiquinone] 1 beta subcomplex subunit ... , 11 types, 22 molecules YBYZBZaBabBbcBcdBdeBenBnoBopBpvBv
+NADH dehydrogenase [ubiquinone] 1 subunit ... , 2 types, 4 molecules fBfgBg
+NADH-ubiquinone oxidoreductase chain ... , 7 types, 14 molecules iBijBjkBklBlmBmrBrsBs
+Cytochrome c oxidase subunit ... , 13 types, 26 molecules xBxyByzBz0B01B12B23B34B45B56B67B78B89B9
+Cytochrome b-c1 complex subunit ... , 9 types, 18 molecules AAANABAOACAPADAQAEARAFASAGATAKAWALAY
+Non-polymers , 14 types, 100 molecules 


























+Details
-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: Human respiratory chain megacomplex-I2III2IV2 / Type: COMPLEX / Entity ID: #1-#68 / 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 |
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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: 1.25 e/Å2 / Film or detector model: FEI FALCON II (4k x 4k) |
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Processing
EM software |
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CTF correction | Type: NONE | ||||||||||||||||||||||||||||||||||||
Symmetry | Point symmetry: C1 (asymmetric) | ||||||||||||||||||||||||||||||||||||
3D reconstruction | Resolution: 17.4 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 8600 / Symmetry type: POINT |