Succinylation is a posttranslational modification where a succinyl group (-CO-CH2-CH2-CO2H) is added to a lysine residue of a protein molecule. This modification is found in many proteins, including histones. The potential role of succinylation is under investigation, but as addition of succinyl group changes lysine's charge from +1 to −1 (at physiological pH) and introduces a relatively large structural moiety (100 Da), bigger than acetylation (42 Da) or methylation (14 Da), it is expected to lead to more significant changes in protein structure and function.
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