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Abstract Complex I is the fi rst enzyme of the respiratory chain and plays a central role in cellular energy production. It has been implicated in many human neurodegenerative diseases, as well as in ageing. One of the biggest membrane protein complexes, varying in size from 0.5 to 1 MDa, it is an L-shaped assembly consisting of hydrophilic and membrane domains. Previously, we determined the structure of the hydrophilic domain in several redox states. It established the pathway for electron transfer from NADH to quinone via seven Fe-S clusters. Recently, we solved the structure of 6 out of 7 membrane domain subunits and described the architecture the entire. | A Structural Perspective on Respiratory Complex I Leonid Sazanov Editor A Structural Perspective on Respiratory Complex I Structure and Function of NADH ubiquinone oxidoreductase .
