Mitochondrial oxidative phosphorylation system and associated phospholipids (OXPHOS)

The mitochondrial oxidative phosphorylation (OXPHOS) system, integrated with its essential phospholipid environment (notably cardiolipin), is the primary site of cellular energy production via ATP synthesis (Paradies et al., 2019, PMID: 31100344). This system consists of five multi-subunit protein complexes (I-V) embedded in the inner mitochondrial membrane, where phospholipids provide the structural scaffold and functional support necessary for electron transfer and proton gradient maintenance (Mejia and Hatch, 2016, PMID: 26703187). Cardiolipin, a unique dimeric phospholipid, is particularly critical as it anchors the respiratory complexes into "supercomplexes" to enhance efficiency and minimize reactive oxygen species (ROS) leakage (Szeto, 2014, PMID: 24102316). Dysregulation of this system, often involving cardiolipin peroxidation or complex mutations, is a hallmark of mitochondrial myopathies, heart failure, and neurodegenerative disorders (Chinnery, 2015, PMID: 25582790). Therapeutic strategies targeting this system include small molecules like elamipretide, which binds to cardiolipin to stabilize the membrane-protein interface and restore bioenergetics (Szeto, 2014, PMID: 24102316). However, because OXPHOS is fundamental to almost all cell types, pharmacological intervention carries risks of systemic toxicity and metabolic disruption such as lactic acidosis (Owen et al., 2000, PMID: 10839993).

Other names

Mitochondrial respiratory chainOXPHOSCardiolipin-respiratory complexInner mitochondrial membrane bioenergetic system

Stabilization of the inner mitochondrial membrane and respiratory supercomplexes through lipid-protein interactions, or direct modulation of electron transport chain complex activity.