Electron Transport Chain and Standard Reduction Potentials in Respiratory Electron Carriers

DESCRIPTION

This chapter delves into the electron transport chain (ETC) and the standard reduction potentials of major respiratory electron carriers. It includes detailed analysis of NADH, CoQ, FMN, and the complexes I-IV, exploring their redox states and interactions in the mitochondrial membrane. The section highlights the significance of carriers like cytochrome c and the role of the Q-cycle in facilitating electron transfer. Additionally, it discusses the coupling of electron transport to oxidative phosphorylation, which is crucial for ATP production in aerobic organisms.

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May 02, 2026

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Electron Transport Chain and Standard Reduction Potentials in Respiratory Electron Carriers

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Chapter 14 (Part 1) Electron transport

Standard reduction potentials of the major respiratory electron carriers.

NADH + H+ CoQ NAD+ CoQH2 Complex I FMN Fe2+S FMNH2 Fe3+S
Succinate CoQ Fumarate CoQH2 FAD Fe2+S FADH2 Fe3+S Complex II
Q-Cycle UQ UQ.- UQH2

CoQH2 cyt c red CoQ cyt c ox cyt c1ox cyt b ox Fe2+S cyt c1red cyt b red Fe3+S Complex III
cyt c red cyt a ox cyt a3red O2 cyt c ox cyt a red cyt a3ox 2 H2O Complex IV