Cytochrome c–cardiolipin complex

The **cytochrome c–cardiolipin complex** refers to the molecular interaction between the mitochondrial protein **cytochrome c** and the phospholipid **cardiolipin** in the inner mitochondrial membrane. This interaction is critical for the initiation of intrinsic apoptosis. Under stress or apoptotic stimuli, cytochrome c binds to cardiolipin, which induces significant conformational changes in the protein, partially unfolding it and converting cytochrome c from an electron carrier to a peroxidase[1][2][3][5]. The peroxidase activity promotes the specific oxidation of cardiolipin, resulting in destabilization of mitochondrial membranes, release of cytochrome c into the cytosol, and activation of downstream apoptotic cascades[1][2][3][5][6]. The underlying binding mechanism involves electrostatic and hydrophobic interactions at several defined sites on cytochrome c (notably the A-, L-, and C-sites), and the process is modulated by the redox state of cytochrome c and by the biophysical properties of the membrane[2][5]. This “interaction” is not in itself a canonical drug target (e.g., it is not a gene/protein product, receptor, or enzyme per se), but it is a fundamental molecular event in apoptosis and is of high interest for therapeutic modulation in diseases characterized by excessive or deficient cell death[1][2][3][5][6]. Because the “cytochrome c–cardiolipin interaction” is a process, not an actionable molecular target such as a receptor or enzyme, it would generally not appear in structured drug target databases. Any therapeutic efforts would most likely aim to modulate the interaction, prevent associated membrane permeabilization, or target its downstream effects.

Other names

Cytochrome c/cardiolipin interactionCytochrome c–cardiolipin complexCyt c–CL interaction

Not applicable as a direct therapeutic target, but mechanisms include activation of peroxidase activity, cardiolipin oxidation, promotion of mitochondrial membrane permeabilization, and apoptosis initiation