Method for optimizing the assembly and production of hetero-multimeric protein complexes

Patent metadata

Field	Value
Publication number	US-2019226001-A1
Application number	US-201816146491-A
Country	US
Kind code	A1
Filing date	Sep 28, 2018
Priority date	Mar 31, 2015
Publication date	Jul 25, 2019
Grant date	—

Abstract

Methods are provided to improve the expression of protein complexes by tuning the expression levels of each component required for the assembly of the complex. These methods are effective in limiting the expression of the dominant chain and, thus, equilibrating their relative abundance. The methods provided herein lead to a significant increase in productivity and final bispecific yields both in transient expression systems as well as in stably transfected mammalian cells.

First claim

What is claimed is:

1 . A method to increase production yield of a protein complex that comprises more than one polypeptide, the method comprising:
(a) providing one or more nucleic acid molecules encoding the polypeptides in the protein complex; (b) introducing the nucleic acid molecule(s) into a cell; (c) culturing the cell under conditions that allow for the expression of polypeptides in the protein complex; and (d) decreasing expression of at least one of the polypeptides in the protein complex.

2 . The method of claim 1 , wherein the reduction in expression of one of the polypeptides in the protein complex is achieved by modifying transcription rate, translation rate, or mRNA stability.

3 . The method of claim 1 , wherein the reduction in expression of one of the polypeptides in the protein complex is achieved by modifying mRNA secondary structure.

4 . The method of claim 1 , wherein the reduction in expression of one of the polypeptides in the protein complex is achieved by modifying transcription rate, by modifying translation rate, by modifying mRNA stability, by modifying mRNA secondary structure, or by modifying any combination of these factors.

5 . The method of claim 4 , wherein the reduction in expression of one of the polypeptides in the protein complex is achieved by modifying translation rate, by altering the codon composition of that polypeptide.

6 . The method of claim 5 , wherein the reduction in expression of one of the polypeptides in the protein complex is achieved by modifying translation rate, by altering the codon composition of that polypeptide via the replacement of certain codons with codons that are less frequently used in the host cell that is used for expression of the protein complex.

7 . The method of claim 6 , wherein the reduction in expression of one of the polypeptides in the protein complex is achieved by modifying translation rate, by altering the codon composition of that polypeptide via the replacement of certain codons with codons that are less frequently used in a mammalian host cell used for expression of the protein complex.

8 . The method of claim 1 , wherein the protein complex is a multispecific antibody.

9 . The method of claim 1 , wherein the protein complex is a bispecific antibody.

10 . The method of claim 9 , wherein the bispecific antibody is composed of two different light chains and a common heavy chain.

11 . The method of claim 1 , wherein more than one protein complex is co-expressed.

12 . The method of claim 11 , wherein the protein complexes are antibodies, and wherein more than one antibody is co-expressed.

Assignees

• Novimmune Sa

Inventors

• Magistrelli Giovanni
• Malinge Pauline
• Poitevin Yves
• Fischer Nicolas

Classifications

• C12N15/67

  General methods for enhancing the expression · CPC title

• C12P21/02

  having a known sequence of two or more amino acids, e.g. glutathione · CPC title

• C07K16/2803

  against the immunoglobulin superfamily · CPC title

• C07K16/468 Primary

  Immunoglobulins having two or more different antigen binding sites, e.g. multifunctional antibodies · CPC title

• C12N2800/22

  Vectors comprising a coding region that has been codon optimised for expression in a respective host · CPC title