Isoglutamyl lysine isopeptide (Gln-Lys) (interchain with K-? in acceptor proteins)
Phosphocysteine intermediate; for EIIB activity
Cysteine sulfenic acid (-SOH) intermediate
Cysteine sulfenic acid (-SOH) intermediate; for peroxidase activity
Schiff-base intermediate with substrate; via pyruvic acid
Cytochrome bc1 complex cytochrome c subunit