Paraoxonase fusion polypeptides and related compositions and methods

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. In certain variations, a dimerizing or FcRn- binding domain is an immunoglobulin Fc region. Also disclosed are dimeric proteins comprising first and second paraoxonase fusion polypeptides as disclosed herein. The fusion polypeptides and dimeric proteins are useful in methods for therapy.

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