5XTB image
Deposition Date 2017-06-18
Release Date 2017-08-30
Last Version Date 2025-04-09
Entry Detail
PDB ID:
5XTB
Title:
Cryo-EM structure of human respiratory complex I matrix arm
Biological Source:
Source Organism:
Homo sapiens (Taxon ID: 9606)
Method Details:
Experimental Method:
Resolution:
3.40 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:NADH dehydrogenase [ubiquinone] flavoprotein 1, mitochondrial
Gene (Uniprot):NDUFV1
Chain IDs:A
Chain Length:431
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:NADH dehydrogenase [ubiquinone] iron-sulfur protein 8, mitochondrial
Gene (Uniprot):NDUFS8
Chain IDs:B
Chain Length:176
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:NADH dehydrogenase [ubiquinone] iron-sulfur protein 7, mitochondrial
Gene (Uniprot):NDUFS7
Chain IDs:C
Chain Length:156
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:NADH dehydrogenase [ubiquinone] 1 alpha subcomplex subunit 6
Gene (Uniprot):NDUFA6
Chain IDs:D (auth: E)
Chain Length:113
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:NADH dehydrogenase [ubiquinone] 1 alpha subcomplex subunit 2
Gene (Uniprot):NDUFA2
Chain IDs:E (auth: F)
Chain Length:83
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:Acyl carrier protein, mitochondrial
Gene (Uniprot):NDUFAB1
Chain IDs:F (auth: G)
Chain Length:85
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:NADH dehydrogenase [ubiquinone] 1 alpha subcomplex subunit 5
Gene (Uniprot):NDUFA5
Chain IDs:G (auth: H)
Chain Length:112
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:NADH dehydrogenase [ubiquinone] 1 alpha subcomplex subunit 7
Gene (Uniprot):NDUFA7
Chain IDs:H (auth: I)
Chain Length:110
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:NADH dehydrogenase [ubiquinone] 1 alpha subcomplex subunit 9, mitochondrial
Gene (Uniprot):NDUFA9
Chain IDs:I (auth: J)
Chain Length:337
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:NADH dehydrogenase [ubiquinone] flavoprotein 3, mitochondrial
Gene (Uniprot):NDUFV3
Chain IDs:J (auth: K)
Chain Length:33
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:NADH dehydrogenase [ubiquinone] iron-sulfur protein 4, mitochondrial
Gene (Uniprot):NDUFS4
Chain IDs:K (auth: L)
Chain Length:118
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:NADH-ubiquinone oxidoreductase 75 kDa subunit, mitochondrial
Gene (Uniprot):NDUFS1
Chain IDs:L (auth: M)
Chain Length:687
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:NADH dehydrogenase [ubiquinone] 1 alpha subcomplex subunit 12
Gene (Uniprot):NDUFA12
Chain IDs:M (auth: N)
Chain Length:143
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:NADH dehydrogenase [ubiquinone] flavoprotein 2, mitochondrial
Gene (Uniprot):NDUFV2
Chain IDs:N (auth: O)
Chain Length:212
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:NADH dehydrogenase [ubiquinone] iron-sulfur protein 3, mitochondrial
Gene (Uniprot):NDUFS3
Chain IDs:O (auth: P)
Chain Length:208
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:NADH dehydrogenase [ubiquinone] iron-sulfur protein 2, mitochondrial
Gene (Uniprot):NDUFS2
Chain IDs:P (auth: Q)
Chain Length:385
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:NADH dehydrogenase [ubiquinone] iron-sulfur protein 6, mitochondrial
Gene (Uniprot):NDUFS6
Chain IDs:Q (auth: T)
Chain Length:95
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:NADH dehydrogenase [ubiquinone] 1 alpha subcomplex subunit 13
Gene (Uniprot):NDUFA13
Chain IDs:R (auth: W)
Chain Length:22
Number of Molecules:1
Biological Source:Homo sapiens
Primary Citation
Architecture of Human Mitochondrial Respiratory Megacomplex I2III2IV2.
Cell 170 1247 1257.e12 (2017)
PMID: 28844695 DOI: 10.1016/j.cell.2017.07.050

Abstact

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-I2III2IV2 (MCI2III2IV2) with 140 subunits and a subset of associated cofactors using cryo-electron microscopy. The MCI2III2IV2 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 c1 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.

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