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Higher Ploidy in Saccharomyces cerevisiae Supports Enhanced Hepatitis B Virus S Cloned Gene Expression at the Pilot Scale
Author(s) -
Fu Jeffrey,
Parker Charles B.,
Burke Pamela,
Schultz Loren D.,
Montgomery Donna L.,
Arnold Beth A.,
McGinnis Kathleen
Publication year - 1996
Publication title -
biotechnology progress
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.572
H-Index - 129
eISSN - 1520-6033
pISSN - 8756-7938
DOI - 10.1021/bp950060m
Subject(s) - ploidy , saccharomyces cerevisiae , biology , hbsag , strain (injury) , fermentation , plasmid , gene , microbiology and biotechnology , virus , genetics , hepatitis b virus , biochemistry , anatomy
Abstract The effect of host strain ploidy on the production of hepatitis B surface antigen (HBsAg) in Saccharomyces cerevisiae was evaluated at the pilot scale (75 L). We found that the accumulation of HBsAg normalized to cell protein was 2‐fold higher for the diploid strain compared to its isogenic haploid. No detectable differences in many fermentation parameters were observed ( e.g. , rate of fermentation, growth rate, final cell yield). However, the enhancement of productivity in the diploid strain appeared to be associated with a slower rate of plasmid shedding (2 μm element) and, thus, a higher average copy number (2‐fold at stationary phase) compared to those of the haploid strain.