Abstract: A directed evolution method for improving performance of a mammalian host cell is provided, as well as host cells generated using the directed evolution method. In one aspect, hydrogen peroxide (H2O2)-evolved host cells are provided. In one aspect, (H2O2)-evolved Chinese hamster ovary (CHO) host cells are provided.

Abstract: The present disclosure relates to nucleic acids that comprise a nucleotide sequence encoding an immunoglobulin heavy chain, wherein the nucleotide sequences of at one or two introns in the immunoglobulin heavy chain are deleted. These nucleic acids are useful for increasing immunoglobulin expression.

Abstract: As demonstrated herein, when composite transcription factor binding sites do not function synergistically, mammalian promoters can be constructed according to simple design rules. Host-cell transcriptional machinery components were analyzed in silico to identify transcription factors with desired expression dynamics. Cognate binding sites were then comprehensively tested in homotypic and heterotypic architectures to assess modularity and determine the transcriptional activity exhibited by a single copy of each site. When elements were specifically selected to prevent combinatorial interactions, heterotypic promoter activities could be accurately modeled simply as a function of constituent binding site copy numbers. As binding site order, spacing, and orientation had minimal effect on promoter activity, blocks could be optimally combined and arranged in silico according to context-specific design-criteria.

Abstract: Simplified models of gene regulation are a fundamental requirement for mammalian synthetic biology. However, at the transcriptional level this has been impeded by the complex design rules governing promoter activity dynamics, preventing de novo-design of regulatory elements with user-defined functionalities. As demonstrated herein, when composite transcription factor binding sites do not function synergistically, mammalian promoters can be constructed according to simple design rules. Host-cell transcriptional machinery components were analyzed in silico to identify transcription factors with desired expression dynamics. Cognate binding sites were then comprehensively tested in homotypic and heterotypic architectures to assess modularity and determine the transcriptional activity exhibited by a single copy of each site.

Abstract: We discovered that recombinant antibody light chains having a murine secretory leader sequence and an SYE motif at the N-terminus are truncated during post-translational processing. This disclosure provides two protein engineering solutions: to alter the SYE amino acid sequence of the Lc N-terminus to other alternatives; or to change the secretory leader peptide sequence. We have shown that both of these solutions are effective for preventing N-terminal light chain truncation.

Abstract: We discovered that recombinant antibody light chains having a murine secretory leader sequence and an SYE motif at the N-terminus are truncated during post-translational processing. This disclosure provides two protein engineering solutions: to alter the SYE amino acid sequence of the Lc N-terminus to other alternatives; or to change the secretory leader peptide sequence. We have shown that both of these solutions are effective for preventing N-terminal light chain truncation.

Abstract: Novel anti-IL-13 antigen-binding proteins such as antibodies and antigen-binding fragments thereof are provided. Methods of using the proteins to reduce IL-13 activity and to treat IL-13-associated diseases and conditions are further provided.

Abstract: The present invention is related to a Chinese hamster ovary cell line as deposited with the European Collection of Cell Cultures (ECACC) under accession number 10090201; use of the cell line for the production of a recombinant polypeptide; a kit comprising the cell line; and methods for the production of recombinant polypeptide.

Abstract: This invention relates to the transient expression of heterologous polypeptides in mammalian cell lines. Specifically it relates to an expression-enhanced cell line derived from a parent cell line, the expression-enhanced cell line comprising nucleic acid encoding Epstein-Barr Virus Nuclear Antigen 1 or a functional derivative, analogue, or variant thereof; and further comprising: (a) a nucleic acid encoding an exogenous glutamine synthetase; (b) a nucleic acid encoding an endogenous glutamine synthetase, wherein the endogenous glutamine is arranged to have enhanced enzymatic activity and/or enhanced expression relative to the parent cell line under comparable conditions; or (c) both (a) and (b).

Abstract: The present invention is related to a Chinese hamster ovary cell line as deposited with the European Collection of Cell Cultures (ECACC) under accession number 10090201; use of the cell line for the production of a recombinant polypeptide; a kit comprising the cell line; and methods for the production of recombinant polypeptide.

Abstract: This invention relates to the transient expression of heterologous polypeptides in mammalian cell lines. Specifically it relates to an expression-enhanced cell line derived from a parent cell line, the expression-enhanced cell line comprising nucleic acid encoding Epstein-Barr Virus Nuclear Antigen 1 or a functional derivative, analogue, or variant thereof; and further comprising: (a) a nucleic acid encoding an exogenous glutamine synthetase; (b) a nucleic acid encoding an endogenous glutamine synthetase, wherein the endogenous glutamine is arranged to have enhanced enzymatic activity and/or enhanced expression relative to the parent cell line under comparable conditions; or (c) both (a) and (b).