Peptidyl Arginine Deiminase Type IV (PADI4)

PADI4 is a member of a gene family which encodes enzymes responsible for the conversion of arginine residues to citrulline residues. This gene may play a role in granulocyte and macrophage development leading to inflammation and immune response.

The deduced 663-amino acid protein, approximately 50% identical to rat PAD types I, II, and III and 73% identical with rat keratinocyte PAD IV, is most conserved in the C terminal two-thirds of the sequence. Functional analysis indicated that the recombinant protein is fully active against arginine-containing substrates. Western blot analysis showed that expression of a 67-kD protein is induced by incubation of HL60 cells with differentiation factors.