Isoglutamyl lysine isopeptide (Gln-Lys) (interchain with K-? in acceptor proteins)
Gly-cisPro motif, important for rejection of L-amino acids
Phosphocysteine intermediate; for EIIB activity
Phosphatidylserine decarboxylase alpha chain
Phosphatidylserine decarboxylase beta chain
Schiff-base intermediate with substrate; via pyruvic acid