Lysine succinylation (Ksucc), defined as a transfer of a succinyl group to a lysine residue of a protein, is a newly identified protein post-translational modification^1-3. This chemical modification is reversible, dynamic, and evolutionarily conserved⁴ where it has been comprehensively studied in both bacterial and mammalian cells^5-7. Numerous proteins involved in the regulation of various cellular and biological processes have been shown to be heavily succinylated^5e7. Emerging clinical data provides evidence that dysregulation of Ksucc is correlated with the development of several diseases, including cardiovascular diseases and cancer^7e9. Therefore, an in-depth understanding of Ksucc and its regulation is important not only for understanding its physiological function but also for developing drug therapies and targeted agents for these diseases. In this review, we highlight some of the recent advances in understanding the role of Ksucc and desuccinylation under physiological and pathological conditions.