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- PDB-8gs8: cryo-EM structure of the human respiratory complex II -

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Basic information

Entry
Database: PDB / ID: 8gs8
Titlecryo-EM structure of the human respiratory complex II
Components
  • (Succinate dehydrogenase [ubiquinone] ...) x 3
  • Succinate dehydrogenase cytochrome b560 subunit, mitochondrial
KeywordsOXIDOREDUCTASE / succinate dehydrogenase / electron transport chain / human mitochondria / oxidative phosphorylation
Function / homology
Function and homology information


regulation of catecholamine secretion / succinate dehydrogenase activity / succinate metabolic process / mitochondrial electron transport, succinate to ubiquinone / mitochondrial respiratory chain complex II, succinate dehydrogenase complex (ubiquinone) / succinate dehydrogenase (quinone) activity / : / Citric acid cycle (TCA cycle) / succinate dehydrogenase / Respiratory electron transport ...regulation of catecholamine secretion / succinate dehydrogenase activity / succinate metabolic process / mitochondrial electron transport, succinate to ubiquinone / mitochondrial respiratory chain complex II, succinate dehydrogenase complex (ubiquinone) / succinate dehydrogenase (quinone) activity / : / Citric acid cycle (TCA cycle) / succinate dehydrogenase / Respiratory electron transport / mitochondrial envelope / ubiquinone binding / 3 iron, 4 sulfur cluster binding / proton motive force-driven mitochondrial ATP synthesis / aerobic respiration / tricarboxylic acid cycle / respiratory electron transport chain / mitochondrial membrane / 2 iron, 2 sulfur cluster binding / flavin adenine dinucleotide binding / nervous system development / 4 iron, 4 sulfur cluster binding / cellular response to hypoxia / mitochondrial inner membrane / electron transfer activity / heme binding / nucleolus / mitochondrion / nucleoplasm / membrane / metal ion binding / plasma membrane
Similarity search - Function
CybS, succinate dehydrogenase cytochrome B small subunit / Succinate dehydrogenase [ubiquinone] cytochrome b small subunit, CybS / Succinate dehydrogenase, cytochrome b556 subunit / Succinate dehydrogenase, cytochrome b subunit, conserved site / Succinate dehydrogenase cytochrome b subunit signature 1. / Succinate dehydrogenase cytochrome b subunit signature 2. / Succinate dehydrogenase, flavoprotein subunit / Succinate dehydrogenase/fumarate reductase type B, transmembrane subunit / Succinate dehydrogenase/Fumarate reductase transmembrane subunit / Fumarate reductase/succinate dehydrogenase, transmembrane subunit ...CybS, succinate dehydrogenase cytochrome B small subunit / Succinate dehydrogenase [ubiquinone] cytochrome b small subunit, CybS / Succinate dehydrogenase, cytochrome b556 subunit / Succinate dehydrogenase, cytochrome b subunit, conserved site / Succinate dehydrogenase cytochrome b subunit signature 1. / Succinate dehydrogenase cytochrome b subunit signature 2. / Succinate dehydrogenase, flavoprotein subunit / Succinate dehydrogenase/fumarate reductase type B, transmembrane subunit / Succinate dehydrogenase/Fumarate reductase transmembrane subunit / Fumarate reductase/succinate dehydrogenase, transmembrane subunit / Succinate dehydrogenase/fumarate reductase, flavoprotein subunit / Fumarate reductase/succinate dehydrogenase, FAD-binding site / FAD-dependent oxidoreductase SdhA/FrdA/AprA / Fumarate reductase / succinate dehydrogenase FAD-binding site. / 4Fe-4S dicluster domain / Succinate dehydrogenase/fumarate reductase iron-sulphur protein / Succinate dehydogenase/fumarate reductase N-terminal / 2Fe-2S iron-sulfur cluster binding domain / Fumarate reductase/succinate dehydrogenase flavoprotein-like, C-terminal / Fumarate reductase flavoprotein C-term / Fumarate reductase/succinate dehydrogenase flavoprotein-like, C-terminal domain superfamily / Succinate dehydrogenase/fumarate reductase flavoprotein, catalytic domain superfamily / FAD-dependent oxidoreductase 2, FAD binding domain / Alpha-helical ferredoxin / FAD binding domain / 2Fe-2S ferredoxin, iron-sulphur binding site / 2Fe-2S ferredoxin-type iron-sulfur binding region signature. / Beta-grasp domain superfamily / 2Fe-2S ferredoxin-type iron-sulfur binding domain profile. / 2Fe-2S ferredoxin-type iron-sulfur binding domain / 2Fe-2S ferredoxin-like superfamily / 4Fe-4S ferredoxin, iron-sulphur binding, conserved site / 4Fe-4S ferredoxin-type iron-sulfur binding region signature. / 4Fe-4S ferredoxin-type iron-sulfur binding domain profile. / 4Fe-4S ferredoxin-type, iron-sulphur binding domain / FAD/NAD(P)-binding domain superfamily
Similarity search - Domain/homology
FE3-S4 CLUSTER / FLAVIN-ADENINE DINUCLEOTIDE / FE2/S2 (INORGANIC) CLUSTER / PROTOPORPHYRIN IX CONTAINING FE / Chem-PEV / IRON/SULFUR CLUSTER / UBIQUINONE-1 / Succinate dehydrogenase [ubiquinone] cytochrome b small subunit, mitochondrial / Succinate dehydrogenase [ubiquinone] iron-sulfur subunit, mitochondrial / Succinate dehydrogenase [ubiquinone] flavoprotein subunit, mitochondrial / Succinate dehydrogenase cytochrome b560 subunit, mitochondrial
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.86 Å
AuthorsDu, Z. / Zhou, X. / Lai, Y. / Xu, J. / Zhang, Y. / Zhou, S. / Liu, F. / Gao, Y. / Gong, H. / Rao, Z.
Funding support China, 3items
OrganizationGrant numberCountry
Chinese Academy of SciencesXDB08020200 China
National Natural Science Foundation of China (NSFC)81520108019, 813300237,32100976,82222042 China
Chinese Academy of Sciences2017YFC0840300,2020YFA0707500 China
CitationJournal: Proc Natl Acad Sci U S A / Year: 2023
Title: Structure of the human respiratory complex II.
Authors: Zhanqiang Du / Xiaoting Zhou / Yuezheng Lai / Jinxu Xu / Yuying Zhang / Shan Zhou / Ziyan Feng / Long Yu / Yanting Tang / Weiwei Wang / Lu Yu / Changlin Tian / Ting Ran / Hongming Chen / ...Authors: Zhanqiang Du / Xiaoting Zhou / Yuezheng Lai / Jinxu Xu / Yuying Zhang / Shan Zhou / Ziyan Feng / Long Yu / Yanting Tang / Weiwei Wang / Lu Yu / Changlin Tian / Ting Ran / Hongming Chen / Luke W Guddat / Fengjiang Liu / Yan Gao / Zihe Rao / Hongri Gong /
Abstract: Human complex II is a key protein complex that links two essential energy-producing processes: the tricarboxylic acid cycle and oxidative phosphorylation. Deficiencies due to mutagenesis have been ...Human complex II is a key protein complex that links two essential energy-producing processes: the tricarboxylic acid cycle and oxidative phosphorylation. Deficiencies due to mutagenesis have been shown to cause mitochondrial disease and some types of cancers. However, the structure of this complex is yet to be resolved, hindering a comprehensive understanding of the functional aspects of this molecular machine. Here, we have determined the structure of human complex II in the presence of ubiquinone at 2.86 Å resolution by cryoelectron microscopy, showing it comprises two water-soluble subunits, SDHA and SDHB, and two membrane-spanning subunits, SDHC and SDHD. This structure allows us to propose a route for electron transfer. In addition, clinically relevant mutations are mapped onto the structure. This mapping provides a molecular understanding to explain why these variants have the potential to produce disease.
History
DepositionSep 5, 2022Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0May 10, 2023Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Succinate dehydrogenase [ubiquinone] flavoprotein subunit, mitochondrial
B: Succinate dehydrogenase [ubiquinone] iron-sulfur subunit, mitochondrial
C: Succinate dehydrogenase cytochrome b560 subunit, mitochondrial
D: Succinate dehydrogenase [ubiquinone] cytochrome b small subunit, mitochondrial
hetero molecules


Theoretical massNumber of molelcules
Total (without water)143,35311
Polymers140,1574
Non-polymers3,1967
Water0
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

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Succinate dehydrogenase [ubiquinone] ... , 3 types, 3 molecules ABD

#1: Protein Succinate dehydrogenase [ubiquinone] flavoprotein subunit, mitochondrial / Flavoprotein subunit of complex II / Fp


Mass: 72786.469 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: SDHA, SDH2, SDHF / Production host: Homo sapiens (human) / References: UniProt: P31040, succinate dehydrogenase
#2: Protein Succinate dehydrogenase [ubiquinone] iron-sulfur subunit, mitochondrial


Mass: 31674.811 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: SDHB / Production host: Homo sapiens (human) / References: UniProt: P21912
#4: Protein Succinate dehydrogenase [ubiquinone] cytochrome b small subunit, mitochondrial


Mass: 17063.990 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: SDHD / Production host: Homo sapiens (human) / References: UniProt: O14521

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Protein , 1 types, 1 molecules C

#3: Protein Succinate dehydrogenase cytochrome b560 subunit, mitochondrial / Integral membrane protein CII-3 / QPs-1 / QPs1 / Succinate dehydrogenase complex subunit C / ...Integral membrane protein CII-3 / QPs-1 / QPs1 / Succinate dehydrogenase complex subunit C / Succinate-ubiquinone oxidoreductase cytochrome B large subunit / CYBL


Mass: 18632.213 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: SDHC, CYB560, SDH3 / Production host: Homo sapiens (human) / References: UniProt: Q99643

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Non-polymers , 7 types, 7 molecules

#5: Chemical ChemComp-FAD / FLAVIN-ADENINE DINUCLEOTIDE / Flavin adenine dinucleotide


Mass: 785.550 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C27H33N9O15P2 / Feature type: SUBJECT OF INVESTIGATION / Comment: FAD*YM
#6: Chemical ChemComp-FES / FE2/S2 (INORGANIC) CLUSTER / Iron–sulfur cluster


Mass: 175.820 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Fe2S2
#7: Chemical ChemComp-SF4 / IRON/SULFUR CLUSTER / Iron–sulfur cluster


Mass: 351.640 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Fe4S4
#8: Chemical ChemComp-F3S / FE3-S4 CLUSTER / Iron–sulfur cluster


Mass: 295.795 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Fe3S4
#9: Chemical ChemComp-UQ1 / UBIQUINONE-1


Mass: 250.290 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C14H18O4
#10: Chemical ChemComp-HEM / PROTOPORPHYRIN IX CONTAINING FE / HEME / Heme B


Mass: 616.487 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C34H32FeN4O4 / Feature type: SUBJECT OF INVESTIGATION
#11: Chemical ChemComp-PEV / (1S)-2-{[(2-AMINOETHOXY)(HYDROXY)PHOSPHORYL]OXY}-1-[(PALMITOYLOXY)METHYL]ETHYL STEARATE / PHOSPHATIDYLETHANOLAMINE / 1-PALMITOYL-2-OLEOYL-SN-GLYCERO-3-PHOSPHOETHANOLAMINE / Phosphatidylethanolamine


Mass: 720.012 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C39H78NO8P / Comment: POPE, phospholipid*YM

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Details

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: The human mitochondrial complex II, composed of SDHA, SDHB, SDHC and SDHD
Type: COMPLEX / Entity ID: #1, #4, #3, #2 / Source: RECOMBINANT
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 7.4
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELDBright-field microscopy / Nominal defocus max: 2000 nm / Nominal defocus min: 1200 nm
Image recordingElectron dose: 50 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.18.2_3874: / Classification: refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 2.86 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 114967 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0118843
ELECTRON MICROSCOPYf_angle_d1.12811994
ELECTRON MICROSCOPYf_dihedral_angle_d23.3573233
ELECTRON MICROSCOPYf_chiral_restr0.0631295
ELECTRON MICROSCOPYf_plane_restr0.0141516

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