This solution contains MgCl2, ATP, and ATP regenerating enzymes to recycle ATP hydrolysis products, (AMP, ADP) to ATP. An ideal energy source for conjugation/degradation assays (ubiquitin, proteasome, SUMO, etc.) particularly those that are preformed with crude lysates/impure reagents that may contain ATP-depleting activities. Formulation: Liquid. In 50mM TRIS-Cl, pH 7.5. Long Term Storage: -80°C.