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.

Liquid. In 50 mM TRIS-Cl, pH 7,5.