Proton donor; for beta-elimination activity
Proton donor; for delta-elimination activity
Nucleophile; for GTP cyclohydrolase activity
Proton acceptor; for GTP cyclohydrolase activity
Involved in ionization of N3 of dUMP, leading to its activation
Isoglutamyl lysine isopeptide (Gln-Lys) (interchain with K-? in acceptor proteins)
Lipocalin-like domain-containing protein
Nucleophile; cysteine thiosulfonate intermediate
Cysteine sulfenic acid (-SOH) intermediate; for peroxidase activity