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Nucleic Acids Research, 1991, Vol. 19, No. 7 1461-1467
© 1991

MOLECULAR BIOLOGY

Expression of tetanus toxin fragment C in yeast: gene synthesis is required to eliminate fortuitous polyadenylation sites in AT-rich DNA

Michael A. Romanos*, Andrew J. Makoff, Neil F. Fairweather, Katrina M. Beesley, Debbie E. Slater, Fred B. Rayment, Mike M. Payne1 and Jeffrey J. Clare

Departments of Molecular Biology, Wellcome Biotech, Langley Court Beckenham, Kent BR3 3BS, UK 1Protein Chemistry, Wellcome Biotech, Langley Court Beckenham, Kent BR3 3BS, UK

* To whom correspondence should be addressed

Received January 11, 1991. Revised March 1, 1991. Accepted March 1, 1991.

Fragment C is a non-toxic 50kDa fragment of tetanus toxin which is a candidate subunit vaccine against tetanus. The AT-rich Clostridium tetani DNA encoding fragment C could not be expressed in Saccharomyces cerevlslae due to the presence of several fortuitous polyadenylation sites which gave rise to truncated mRNAs. The polyadenylation sites were eliminated by chemically synthesising the DNA with increased GC-content (from 29% to 47%). Synthesis of the entire gene (1400 base pairs) was necessary to generate full-length transcripts and for protein production in yeast. Using a GAL1 promoter vector, fragment C was expressed to 2–3% of soluble cell protein. Fragment C could also be secreted using the {alpha}-factor leader peptlde as a secretion signal. The protein was present at 5–10mg/I in the culture medium in two forms: a high molecular mass hyper-glycosylated protein (75–200kDa) and a core-glycosylated protein (65kDa). Intracellular fragment C was as effective In vaccinating mice against tetanus as authentic fragment C. The glycosylated material was inactive, though It was rendered fully active by de-glycosylation.


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