Complex III of Electron Transport Chain

Introduction

spinqualitylabelsall models Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D load='1kyo' size='350' frame='false' scene='Sandbox61/Homodimer/2'
1kyo, resolution 2.97Å (default scene)
Ligands:	FES, HEM, SMA
Non-Standard Residues:	M3L
Activity:	Ubiquinol--cytochrome-c reductase, with EC number 1.10.2.2
Related:	1ezv, 1kb9
Structural annotation: Resources: CATH : 1Kyoa02, 1Kyoa01, 1Kyob02, 1Kyob01, 1Kyoc00, 1Kyod01, 1Kyod02, 1Kyoe01, 1Kyoe02, 1Kyof00, 1Kyog00, 1Kyoh00, 1Kyoi00, 1Kyoj00, 1Kyok00, 1Kyol02, 1Kyol01, 1Kyom02, 1Kyom01, 1Kyon00, 1Kyoo01, 1Kyoo02, 1Kyop01, 1Kyop02, 1Kyoq00, 1Kyor00, 1Kyos00, 1Kyot00, 1Kyou00, 1Kyov00, 1Kyow00 InterPro : Ipr011237, Ipr001431, Ipr007863, Ipr011249, Ipr011765, Ipr005798, Ipr005797, Ipr002326, Ipr009056, Ipr004192, Ipr006317, Ipr005806, Ipr014349, Ipr005805, Ipr003422, Ipr003197, Ipr004205, Ipr008027, Ipr003088, Ipr012125, Ipr002327 Pfam : PF00675, PF05193, PF00032, PF00033, PF02167, PF02921, PF00355, PF02271, PF02939, PF05365, PF00034 SCOP : d1kyoa2, d1kyoa1, d1kyob2, d1kyob1, d1kyoc2, d1kyoc3, d1kyod2, d1kyod1, d1kyoe2, d1kyoe1, d1kyof_, d1kyog_, d1kyoh_, d1kyoi_, d1kyol1, d1kyol2, d1kyom2, d1kyom1, d1kyon2, d1kyon3, d1kyoo2, d1kyoo1, d1kyop1, d1kyop2, d1kyoq_, d1kyor_, d1kyos_, d1kyot_, d1kyow_ UniProt : P07256, P07257, P00163, P07143, P08067, P00127, P00128, P08525, P22289, P00044
Functional annotation: Cellular component: mitochondrial respiratory chain mitochondrion membrane mitochondrial respiratory chain complex III integral to membrane mitochondrial inner membrane mitochondrial envelope mitochondrial intermembrane space Biological process: aerobic respiration electron transport proteolysis transport mitochondrial electron transport, ubiquinol to cytochrome c oxidative phosphorylation cytochrome bc(1) complex assembly iron-sulfur cluster assembly Molecular function: zinc ion binding protein binding metalloendopeptidase activity ubiquinol-cytochrome-c reductase activity iron ion binding metal ion binding electron transporter, transferring electrons within CoQH2-cytochrome c reductase complex activity oxidoreductase activity heme binding electron carrier activity iron-sulfur cluster binding 2 iron, 2 sulfur cluster binding
Evolutionary conservation: Toggle Conservation Colors: Rows = identical sequences: Further Information: Caveats, Explanation, Complete Results at ConSurfDB
Resources:	FirstGlance, OCA, PDBsum, RCSB
Coordinates:	save as pdb, mmCIF, xml

Complex III of the electron transport chain contains as many as 11 subunits per monomer. In this opening structure it is shown with 9. Show orientation within the inner mitochondrial membrane with labels. Coloring one subunit grey reveals that one of the peptides of each subunit invades the space of the other subunit. Three of the subunits of each monomeric unit have a direct role in the passage of electrons in the respiratory chain. The subunits that are colored are active in the electron transport chain. The interior spaces which are created by the positions of the other subunits have a role in the movement of the substrates from one active site to another, and these peptides have other catalytic activities.

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Karl Oberholser, Michal Harel, Jaime Prilusky, Eran Hodis, Alexander Berchansky