Schiff-base intermediate with substrate; via pyruvic acid
Cysteine sulfenic acid (-SOH) intermediate; for peroxidase activity
Cysteine sulfenic acid (-SOH) intermediate
Nucleophile; for GTP cyclohydrolase activity
Proton acceptor; for GTP cyclohydrolase activity
Conserved alanine and proline rich protein
Isoglutamyl lysine isopeptide (Gln-Lys) (interchain with K-? in acceptor proteins)