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Possible cardiolipin (CL) binding sites on cytochrome c.
Structure of native cyt c (1HRC). Several domains that are likely involved in interactions with CL and acting as heme-iron ligands include the following amino acid residues: Lys72, Lys73, Lys86 and Lys87 (A-site), Asn52 (C-site) and Lys22, Lys25, His26, Lys27 and His33 (L-site). Met80 and His18 form coordination bonds with heme. Intrinsic fluorescence of Trp59 is quenched by the proximity to the heme moiety.
