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Structure paper

TitleIn-cell architecture of the mitochondrial respiratory chain.
Journal, issue, pagesScience, Vol. 387, Issue 6740, Page 1296-1301, Year 2025
Publish dateMar 21, 2025
AuthorsFlorent Waltz / Ricardo D Righetto / Lorenz Lamm / Thalia Salinas-Giegé / Ron Kelley / Xianjun Zhang / Martin Obr / Sagar Khavnekar / Abhay Kotecha / Benjamin D Engel /
PubMed AbstractMitochondria regenerate adenosine triphosphate (ATP) through oxidative phosphorylation. This process is carried out by five membrane-bound complexes collectively known as the respiratory chain, ...Mitochondria regenerate adenosine triphosphate (ATP) through oxidative phosphorylation. This process is carried out by five membrane-bound complexes collectively known as the respiratory chain, working in concert to transfer electrons and pump protons. The precise organization of these complexes in native cells is debated. We used in situ cryo-electron tomography to visualize the native structures and organization of several major mitochondrial complexes in cells. ATP synthases and respiratory complexes segregate into curved and flat crista membrane domains, respectively. Respiratory complexes I, III, and IV assemble into a respirasome supercomplex, from which we determined a native 5-angstrom (Å) resolution structure showing binding of electron carrier cytochrome . Combined with single-particle cryo-electron microscopy at 2.4-Å resolution, we model how the respiratory complexes organize inside native mitochondria.
External linksScience / PubMed:40112058
MethodsEM (single particle) / EM (subtomogram averaging)
Resolution2.21 - 28.5 Å
Structure data

EMDB-50202, PDB-9f5x:
Structure of the Chlamydomonas reinhardtii respiratory supercomplex I1 III2 IV2
Method: EM (single particle) / Resolution: 2.82 Å

EMDB-50203, PDB-9f5y:
Structure of the Chlamydomonas reinhardtii respiratory complex I from respiratory supercomplex
Method: EM (single particle) / Resolution: 2.51 Å

EMDB-50204, PDB-9f5z:
Structure of the Chlamydomonas reinhardtii respiratory complex III from respiratory supercomplex
Method: EM (single particle) / Resolution: 2.39 Å

EMDB-50205, PDB-9f60:
Structure of the Chlamydomonas reinhardtii respiratory complex IV from respiratory supercomplex
Method: EM (single particle) / Resolution: 2.39 Å

EMDB-50206, PDB-9f61:
Structure of the Chlamydomonas reinhardtii respiratory complex IV from respiratory supercomplex
Method: EM (single particle) / Resolution: 2.55 Å

EMDB-50207: Structure of the Chlamydomonas reinhardtii respiratory supercomplex, focused on complex I matrix part
Method: EM (single particle) / Resolution: 2.34 Å

EMDB-50208: Structure of the Chlamydomonas reinhardtii respiratory supercomplex, focused on complex I proximal membrane part
Method: EM (single particle) / Resolution: 2.3 Å

EMDB-50209: Structure of the Chlamydomonas reinhardtii respiratory supercomplex, focused on complex I distal membrane part
Method: EM (single particle) / Resolution: 2.21 Å

EMDB-50210: Subtomogram average of the Chlamydomonas reinhardtii mitochondrial respirasome - C2 symmetry
PDB-9f62: Subtomogram average of the Chlamydomonas reinhardtii mitochondrial respirasome I2 III4 IV6
Method: EM (subtomogram averaging) / Resolution: 5.44 Å

EMDB-50211: Subtomogram average of the Chlamydomonas reinhardtii mitochondrial respirasome - C2 expanded
Method: EM (subtomogram averaging) / Resolution: 6.18 Å

EMDB-50212: Structure of the putative Chlamydomonas mitochondrial prohibitin
Method: EM (subtomogram averaging) / Resolution: 28.5 Å

EMDB-50213: Subtotomogram average of Chlamydomonas mitochondrial ribosome
Method: EM (subtomogram averaging) / Resolution: 21.8 Å

EMDB-50214: Subtomogram average of the Chlamydomonas reinhardtii mitochondrial respirasome - C2 expanded, complex I focus
Method: EM (subtomogram averaging) / Resolution: 5.6 Å

EMDB-50215: Subtomogram average of the Chlamydomonas reinhardtii mitochondrial respirasome - C2 expanded, complex III focus
Method: EM (subtomogram averaging) / Resolution: 6.2 Å

EMDB-50216: Subtomogram average of the Chlamydomonas reinhardtii mitochondrial respirasome - C1 symmetry
Method: EM (subtomogram averaging) / Resolution: 7.05 Å

EMDB-50248: Structure of the Chlamydomonas reinhardtii respiratory supercomplex, focused on complex I
Method: EM (single particle) / Resolution: 2.51 Å

EMDB-50249: Structure of the Chlamydomonas reinhardtii respiratory supercomplex I1 III2 IV2
Method: EM (single particle) / Resolution: 2.82 Å

Chemicals

ChemComp-UQ5:
2,3-DIMETHOXY-5-METHYL-6-(3,11,15,19-TETRAMETHYL-EICOSA-2,6,10,14,18-PENTAENYL)-[1,4]BENZOQUINONE

ChemComp-HEM:
PROTOPORPHYRIN IX CONTAINING FE

ChemComp-CDL:
CARDIOLIPIN / phospholipid*YM

ChemComp-3PH:
1,2-DIACYL-GLYCEROL-3-SN-PHOSPHATE

ChemComp-PTY:
PHOSPHATIDYLETHANOLAMINE / phospholipid*YM

ChemComp-HEC:
HEME C

ChemComp-PC7:
(7S)-4-HYDROXY-N,N,N-TRIMETHYL-9-OXO-7-[(PALMITOYLOXY)METHYL]-3,5,8-TRIOXA-4-PHOSPHAHEXACOSAN-1-AMINIUM 4-OXIDE / phospholipid*YM

ChemComp-ZN:
Unknown entry

ChemComp-PGT:
(1S)-2-{[{[(2R)-2,3-DIHYDROXYPROPYL]OXY}(HYDROXY)PHOSPHORYL]OXY}-1-[(PALMITOYLOXY)METHYL]ETHYL STEARATE / phospholipid*YM

ChemComp-HEA:
HEME-A

ChemComp-CU:
COPPER (II) ION

ChemComp-MG:
Unknown entry

ChemComp-CUA:
DINUCLEAR COPPER ION

ChemComp-FES:
FE2/S2 (INORGANIC) CLUSTER

ChemComp-FMN:
FLAVIN MONONUCLEOTIDE

ChemComp-SF4:
IRON/SULFUR CLUSTER

ChemComp-8Q1:
S-[2-({N-[(2R)-2-hydroxy-3,3-dimethyl-4-(phosphonooxy)butanoyl]-beta-alanyl}amino)ethyl] dodecanethioate

ChemComp-NDP:
NADPH DIHYDRO-NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE

ChemComp-COO:
CROTONYL COENZYME A

ChemComp-HOH:
WATER

Source
  • chlamydomonas reinhardtii (plant)
  • Brassica oleracea var. botrytis (cauliflower)
KeywordsMEMBRANE PROTEIN / Mitochondria / respiratory complex / respiration / alga / mitoribosome / assembly factor / plant / RIBOSOME / respirasome

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