Modified Albumin-Binding Domains and Uses Thereof to Improve Pharmacokinetics

The present invention relates to compositions and methods comprising a modified albumin-binding domain to improve the pharmacokinetic properties of therapeutic molecules. The modified peptides show reduced immunogenicity and/or proved solubility. In particular, compositions and methods for enhancing therapeutic potential of protein therapeutics are provided including linking a protein albumin-binding domain, which has been modified to reduce immunogenicity and/or improve solubility, to a therapeutic protein, including therapeutic antibodies, antibody fragments, antibody single domains and/or dimers of antibody single domains. These linked polypeptides can exhibit enhanced serum half life without exacerbated immunogenicity and/or without decreased solubility, and without substantially affecting the specific binding properties of the therapeutic protein.