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e- Transport Chain

Uni of Notts, Signalling & Metabolic Regulation, year 2, topic 17

TermDefinition
Trend of Gibbs free energy in reactants of the ETC Electron flow from NADH (E°' −0.32 V, good reducing agent) to O₂ (E°' +0.82 V, strong oxidising agent) gives positive ΔE°' and negative ΔG°'. Spontaneous redox reactions lower Gibbs free energy of reactants until equilibrium (ΔG=0)
ETC complex prosthetic groups: Flavins, CoQ, cytochromes, Fe-S groups, Cu++ Flavoprotein: MonoNucleotide (FMN) Adenosine Dinucleotide (FAD) CoQ: Ubiquinone <-> semiquinone <-> ubiquinol Cytochromes: C haem group Fe-S clusters: Pyrite Cu++: Copper centres
Types, complex, function: Flavins FMN (I) & FAD (II). Transports 2e- & 2H+ individually, unlike NADH which transports 2 simultaneously. Transduces e- pairs to single e- so downstream carriers (CoQ & Fe-S) can accept them
Types, complex, function: CoQ Ubiquinone (I, II, III), mobile highly hydrophobic e- carrier, diffuses freely in fatty acyl hydrophobic cores of inner membrane to carry 1 or 2 e- to shuttle them with protons through complexes
Types, complex, function: Cytochrome Cytochrome c (III, IV) haem group with porphyrin ring, have redox potential to transport e- from CoQ while releasing protons to inter-membrane space
Types, complex, function: Fe-S
Created by: Denny12
 

 



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