Enhancing the circulating half-life of antibody-based fusion proteins
First Claim
1. A method for increasing the circulating half-life of an antibody-based fusion protein having an immunoglobulin (Ig) chain linked to a non-Ig protein via a junction point, the method comprising expressing the antibody-based fusion protein as an N-terminal Ig chain linked to a C-terminal non-Ig protein, the Ig chain comprising an IgG2, IgG3, IgG4, IgA, IgM, IgD, or IgE constant domain and an amino acid substitution introducing a hydrophobic or non-polar amino acid within 10 amino acids from the C-terminus of the Ig chain.
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Accused Products
Abstract
Disclosed are compositions and methods for enhancing the circulating half-life of antibody-based fusion proteins. Disclosed methods and compositions rely on altering the amino acid sequence of the junction region between the antibody moiety and the fused protein moiety in an antibody-based fusion protein. An antibody-based fusion protein with an altered amino acid sequence in the junction region has a greater circulating half-life when administered to a mammal. Disclosed methods and compositions are particularly useful for reducing tumor size and metastasis in a mammal.
221 Citations
42 Claims
- 1. A method for increasing the circulating half-life of an antibody-based fusion protein having an immunoglobulin (Ig) chain linked to a non-Ig protein via a junction point, the method comprising expressing the antibody-based fusion protein as an N-terminal Ig chain linked to a C-terminal non-Ig protein, the Ig chain comprising an IgG2, IgG3, IgG4, IgA, IgM, IgD, or IgE constant domain and an amino acid substitution introducing a hydrophobic or non-polar amino acid within 10 amino acids from the C-terminus of the Ig chain.
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20. A method for increasing the circulating half-life of an antibody-based fusion protein having an immunoglobulin (Ig) chain linked to a non-Ig protein via a junction point, the method comprising expressing the antibody-based fusion protein as an N-terminal Ig chain linked to a C-terminal non-Ig protein, the Ig chain comprising:
- at least one of a CH2 and CH3 domain; and
an amino acid sequence that is non-natural within 10 amino acids from its C-terminus, the non-natural amino acid sequence comprising an amino acid substitution introducing a hydrophobic or non-polar amino acid. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
- at least one of a CH2 and CH3 domain; and
- 32. A method for increasing the circulating half-life of an antibody-based fusion protein having an immunoglobulin (Ig) chain linked to a non-Ig protein via a junction point, the method comprising expressing the antibody-based fusion protein as an N-terminal immunoglobulin (Ig) chain linked to a C-terminal non-Ig protein, the Ig chain comprising an amino acid substitution within 10 amino acids from the C-terminus, the substitution replacing a charged amino acid with a hydrophobic or non-polar amino acid.
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35. A method for increasing the circulating half-life of an antibody-based fusion protein having an immunoglobulin (Ig) chain linked to a non-Ig protein via a junction point, the method comprising expressing the antibody-based fusion protein as an N-terminal immunoglobulin (Ig) chain linked to a C-terminal non-Ig protein, the N-terminal Ig chain comprising an amino acid substitution within 10 amino acids from the C-terminus of the Ig chain, the substitution introducing a hydrophobic or non-polar amino acid selected from the group consisting of Ala, Gly and Trp.
- 36. A method for increasing the circulating half-life of an antibody-based fusion protein having an immunoglobulin (Ig) chain linked to a non-Ig protein via a junction point, the method comprising expressing the antibody-based fusion protein as an N-terminal Ig chain linked to a C-terminal non-Ig protein, the C-terminal non-Ig protein comprising an amino acid substitution introducing a hydrophobic or non-polar amino acid within 10 amino acids of the N-terminus of the C-terminal non-Ig protein.
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42. A method for increasing the circulating half-life of an antibody-based fusion protein having an immunoglobulin (Ig) chain linked to a non-Ig protein via a junction point, the method comprising expressing the antibody-based fusion protein as an N-terminal immunoglobulin (Ig) chain linked to a C-terminal non-Ig protein, the Ig chain comprising at least one of a CH2 and a CH3 domain, and the C-terminal non-Ig protein comprising an amino acid alteration within 10 amino acids of the N-terminus of the C-terminal non-Ig protein, the alteration introducing an amino acid selected from the group consisting of Leu and Trp.
Specification