Reaction catalyzed by E1 SAMP-activating enzyme (6.2.1.55)
ATP
+
+
=
AMP
+
+
ATP
+
[SAMP3]-Gly-Gly
+
[protein]-L-lysine
=
AMP
+
diphosphate
+
N6-[[SAMP3]-Gly-Gly]-[[protein]-L-lysine]
