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Increased disulphide dimer formation of latent associated peptide fusions of TGF-ß by addition of L-cystine.

journal contribution
posted on 2023-06-08, 14:11 authored by Lisa MullenLisa Mullen, Gill Adams, Yuti Chernajovsky
The development of novel protein therapeutics relies on the ability to express appreciable amounts of correctly folded recombinant proteins. Latent IFN-ß is engineered using the latency-associated peptide (LAP) of transforming growth factor ß1 (TGF-ß1) to maintain IFN-ß in a biologically inactive form until such time as it is released at sites of inflammation by matrix metalloproteinase activity (see Adams et al., 2003). CHO cells cultured in suspension were used for expression of latent IFN-ß to allow medium scale transient transfection. However, the recombinant protein expressed in this system consisted of a mixture of properly linked disulphide dimers and monomers. The ratio of dimer:monomer produced could be significantly altered towards increased dimer production by the addition of L-cystine to the CHO culture medium. The total yield of latent IFN-ß was increased by co-transfection of plasmid coding for the simian virus (SV) 40 large T antigen to the plasmid with the SV40 origin of replication expressing latent IFN-ß DNA. These results provide valuable new insights for developing protocols to produce substantial quantities of latent cytokine dimers in CHO cells in suspension.

History

Publication status

  • Published

Journal

Journal of biotechnology

ISSN

1873-4863

Publisher

Elsevier

Issue

3

Volume

161

Page range

269-277

Department affiliated with

  • Clinical and Experimental Medicine Publications

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2013-01-18

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