Protein carbonylation (PC)

Protein carbonylation is a non-enzymatic, irreversible post-translational modification characterized by the introduction of carbonyl groups, such as aldehydes and ketones, into protein side chains (Dalle-Donne et al., 2003, doi:10.1016/s0098-2997(03)00028-3). This modification typically occurs through the direct oxidation of amino acid residues—primarily proline, arginine, lysine, and threonine—by reactive oxygen species (ROS), or via secondary reactions with reactive carbonyl species derived from lipid peroxidation or glycation (Fedorova et al., 2014, doi:10.1016/j.freeradbiomed.2014.04.016). The accumulation of carbonylated proteins is a hallmark of cellular oxidative stress and is associated with protein misfolding, loss of enzymatic activity, and increased susceptibility to proteolytic degradation (Nyström, 2005, doi:10.1038/sj.emboj.7600524). While it is not a traditional therapeutic target like a receptor or enzyme, protein carbonylation serves as a critical biomarker for various age-related and chronic conditions, including Alzheimer’s disease, diabetes, and cardiovascular disorders (Berlett & Stadtman, 1997, doi:10.1074/jbc.272.33.20313). Therapeutic strategies in this context often involve the use of carbonyl scavengers like hydralazine and carnosine, which aim to neutralize reactive intermediates and mitigate downstream cellular damage (Negre-Salvayre et al., 2008, doi:10.1038/sj.bjp.0707524).

Other names

Protein carbonylsOxidative protein modificationCarbonyl stressProtein carbonyl content

Direct scavenging of reactive carbonyl species (RCS) and inhibition of oxidative precursors to prevent irreversible protein damage.