Chemistry: molecular biology and microbiology – Micro-organism – tissue cell culture or enzyme using process... – Recombinant dna technique included in method of making a...
Reexamination Certificate
2005-01-04
2005-01-04
Mertz, Prema (Department: 1646)
Chemistry: molecular biology and microbiology
Micro-organism, tissue cell culture or enzyme using process...
Recombinant dna technique included in method of making a...
C435S069700, C435S471000, C435S325000, C435S320100, C530S351000
Reexamination Certificate
active
06838260
ABSTRACT:
Disclosed are methods for producing fusion proteins with the heterodimeric cytokine, interleukin-12. In order to insure that the proper ratio of fused and non-fused subunits are obtained in the fusion protein, a specific stepwise approach to genetic engineering is used. This consists of first expressing the non-fused p40 IL-12 subunit in a production cell line, followed by or simultaneously expressing in the same cell, a second recombinant fusion protein consisting of the fused polypeptide linked by a peptide bond to the p35 subunit of IL-12. Molecules containing the p35 fusion protein cannot be secreted from the transfected mammalian cell without first complexing in a one to one ratio with the p40 subunit, thus ensuring the production of active heterodimeric fusion proteins.
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Gillies Stephen D.
Lan Yan
Lo Kin-Ming
EMD Lexigen Research Center Corp.
Mertz Prema
Testa Hurwitz & Thibeault LLP
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