Ovarian cancer and DNA repair: DNA ligase IV as a potential key

Figure 3 Enzymatic ligation of DNA by DNA ligase. The three-step reaction results in the sequential transfer of AMP (adenosine 5’-monophosphate) to an active-site lysine in Lig enzyme (step 1) then to DNA end (step 2), which results in the formation of a phosphodiester bond and consequently to a ligated DNA product (step 3). Lig: Ligase. Aapted from Ellenberger et al[49].