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
2007-01-23
2007-01-23
Qian, Celine (Department: 1636)
Chemistry: molecular biology and microbiology
Micro-organism, tissue cell culture or enzyme using process...
Recombinant dna technique included in method of making a...
C435S069700, C435S254210, C435S320100, C536S023100, C536S024100
Reexamination Certificate
active
11046099
ABSTRACT:
Compositions and methods for expression of heterologous mammalian proteins and their secretion in the biologically active mature form using a yeast host cell as the expression system are provided. Compositions of the invention are nucleotide sequences encoding a signal peptide sequence for a yeast secreted protein, an optional leader peptide sequence for a yeast secreted protein, a native propeptide leader sequence for a mature protein of interest, and a sequence for the mature protein of interest, all operably linked to a yeast promoter. Each of these elements is associated with a processing site recognized in vivo by a yeast proteolytic enzyme. Any or all of these processing sites may be a preferred processing site that has been modified or synthetically derived for more efficient cleavage in vivo. The compositions are useful in methods for expression of heterologous mammalian proteins and their secretion in the biologically active mature form. Particularly, vectors comprising these nucleotide coding sequences can be used to transform a yeast host cell, which can then be cultured and screened for secretion of the biologically active mature protein of interest.
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Abrahamson Susan
Chiron Corporation
Harbin Alisa A.
Henry Leslie
Qian Celine
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