Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 372074
Title Stimulation of chymosin secretion by simultaneous expression with chymosin-binding llama single-domain antibody fragments in yeast
Author(s) Harmsen, M.M.; Smits, C.B.; Geus, B. de
Source Applied Microbiology and Biotechnology 60 (2002)4. - ISSN 0175-7598 - p. 449 - 454.
Department(s) ID - Infectieziekten
Publication type Refereed Article in a scientific journal
Publication year 2002
Keyword(s) saccharomyces-cerevisiae - escherichia-coli - monoclonal-antibodies - protein - overexpression - sequence - reveals - peptide - library - sites
Abstract We studied the effect of coexpression of chymosin and chymosin-binding llama single-domain antibody fragments (VHHs) on the secretion of chymosin by Saccharomyces cerevisiae cells. A VHH expression library containing chymosin-specific VHHs was obtained by immunization of a llama and coexpressed with chymosin in yeast. From this library, we obtained two VHH clones that stimulated chymosin secretion by screening colonies for the level of chymosin secreted. These VHHs bound biotinylated chymosin in an immunoblot procedure but failed to bind chymosin in ELISA, suggesting that their interaction with chymosin was of low affinity. In a second approach, chymosin-specific VHHs were first selected using phage display and then coexpressed with chymosin in yeast cells. Screening yeast cells for higher levels of chymosin secretion resulted in 11 VHHs. Sequence analysis revealed that these 11 VHHs formed four sets of related VHHs that were different from the previously isolated two VHHs. Although binding of VHHs to chymosin could not be demonstrated in ELISA using soluble VHHs, it could be unambiguously demonstrated for clones isolated by phage display, using phage-displayed VHHs. Finally, quantitative Western blot analysis of chymosin amounts demonstrated that coexpression with VHH domains can stimulate the level of secreted chymosin 1.5- to 6-fold
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