Abstract: Compositions and methods relating to paraoxonase fusion polypeptides are disclosed. In some aspects, the fusions are bispecific molecules that include a first biologically active polypeptide linked amino-terminal to a biologically active paraoxonase (e.g., human PON1 or a variant thereof), wherein the first biologically active polypeptide is a DNase, an RNase, a SOD1, a CTLA-4 extracellular domain, a CD40 extracellular domain, or a polypeptide that specifically binds and neutralizes an inflammatory cytokine. Bispecific fusions may further include a second biologically active polypeptide (e.g., a dimerizing domain or a domain that specifically binds to the neonatal Fc receptor (FcRn)) linked carboxyl-terminal to the first biologically active polypeptide and amino-terminal to the paraoxonase. In other aspects, a fusion polypeptide includes a biologically active paraoxonase linked carboxyl-terminal or amino-terminal to a dimerizing or FcRn-binding domain.

Abstract: The present invention provides improved fusion proteins for therapy of autoimmune and cardiovascular disease.