40 e1 energy diagram
Schematic diagram depicting the process of the ubiquitin-proteasome system. First, ubiquitin is activated by E1 with the energy provided by ATP. Subsequently, the activated ubiquitin is transferred to an active cysteine of E2. And then, E3 catalyzes the transfer of ubiquitin from E2 to the substrate with the formation of an isopeptide bond ... For a system with heat transfer Q and work W, the change in internal energy E from state 1 to state 2 is equal to the difference in the heat transfer into the system and the work done by the system: E2 - E1 = Q - W The work and heat transfer depend on the process used to change the state. A potential energy diagram for an S N 1 reaction shows that the carbocation intermediate can be visualized as a kind of valley in the path of the reaction, higher in energy than both the reactant and product but lower in energy than the two transition states. E1 energy diagram