6.3.2.2 ATP + L-glutamate + L-cysteine = ADP + phosphate + gamma-L-glutamyl-L-cysteine bi bi uni uni ping pong mechanism, with glutamyl-enzyme as intermediate before the addition of cys and the release of gamma-glutamylcysteine 1135 6.3.2.2 ATP + L-glutamate + L-cysteine = ADP + phosphate + gamma-L-glutamyl-L-cysteine Cys553 is not the active site residue 649655 6.3.2.2 ATP + L-glutamate + L-cysteine = ADP + phosphate + gamma-L-glutamyl-L-cysteine enzyme-bound reaction intermediate is a gamma-glutamyl-phosphate, active site cysteine, catalytic mechanism and substrate binding 649263 6.3.2.2 ATP + L-glutamate + L-cysteine = ADP + phosphate + gamma-L-glutamyl-L-cysteine enzyme-bound reaction intermediate is a gamma-glutamyl-phosphate, active site cysteine, catalytic mechanism, active site and substrate binding, Lys38 is an active site residue in the glutamyl binding site, His150 is essential for activity 649263 6.3.2.2 ATP + L-glutamate + L-cysteine = ADP + phosphate + gamma-L-glutamyl-L-cysteine enzyme-bound reaction intermediate is a gamma-glutamyl-phosphate, active site cysteine, mechanism 649263 6.3.2.2 ATP + L-glutamate + L-cysteine = ADP + phosphate + gamma-L-glutamyl-L-cysteine no conserved cysteine residue in the active site 649263 6.3.2.2 ATP + L-glutamate + L-cysteine = ADP + phosphate + gamma-L-glutamyl-L-cysteine partially random mechanism in which ATP is the obligatory first substrate and both amino acids bind in a random order to the enzyme*ATP complex. Formation of the enzyme*substrate quarternary complex is necessary prior to release of products 1136 6.3.2.2 ATP + L-glutamate + L-cysteine = ADP + phosphate + gamma-L-glutamyl-L-cysteine rapid equilibrium random ter-reactant mechanism, substrate binding modeling, active site model 650135 6.3.2.2 ATP + L-glutamate + L-cysteine = ADP + phosphate + gamma-L-glutamyl-L-cysteine rapid equilibrium random ter-reactant mechanism, substrate binding modeling, Cys319 is an active site cysteine not essential for activity 651896 6.3.2.2 ATP + L-glutamate + L-cysteine = ADP + phosphate + gamma-L-glutamyl-L-cysteine reaction and kinetic mechanism, modeling 651896