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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    Ion-exchange chromatographic protein refolding
    Freydell, E. ; Wielen, L. van der; Eppink, M.H.M. ; Ottens, M. - \ 2010
    Journal of Chromatography. A, Including electrophoresis and other separation methods 1217 (2010)46. - ISSN 0021-9673 - p. 7265 - 7274.
    hydrophobic interaction chromatography - size-exclusion chromatography - egg-white lysozyme - escherichia-coli - inclusion-bodies - human proinsulin - expression systems - solubilization - renaturation - column
    The application of ion-exchange (IEX) chromatography to protein refolding (IExR) has been successfully proven, as supported by various studies using different model proteins, ion-exchange media and flow configurations. Ion-exchange refolding offers a relatively high degree of process intensification, represented by the possibility of performing protein refolding, product purification and product concentration, in one unit operation. Besides its high degree of process intensification, IExR offers an additional set of key advantages including: spatial isolation of the bound protein molecules and the controllable change in chemical composition using gradients. Despite of the acknowledgement of the former advantages, the lack of mechanistic understanding on how they influence the process performance of the ion-exchange refolding reactor, limits the ability to exploit them in order to optimize the performance of the unit. This paper presents a quantitative analysis that assesses the effect that the spatial isolation and the urea gradient, have on the IExR performance, judged on the basis of the refolding yield (YN) and the fractional mass recovery (fProt,Rec). Additionally, this work discusses the effect of the protein load, the protein loading state (i.e., native, denatured, denatured and reduced (D&R)) and the adsorbent type on fProt,Rec. The presented work shows: (1) that the protein load has a direct effect on fProt,Rec, and the magnitude of this effect depends on the loading state of the protein solution and the adsorbent type; (2) that irrespectively of the type of adsorbent used, the saturation capacity of a denatured protein is less than the native protein and that this difference can be linked to differences in accessible binding surface area; (3) that there is a clear correlation between fractional surface coverage (¿) and fProt,Rec, indicating that the former could serve as a good descriptor to assess spatial isolation, and (4) that the urea gradient has a direct link with the variations on the refolding yield, and this link can be quantitatively estimated using as descriptor the urea gradient slope (¿). Overall, the information provided in this paper aims at the eventual development of rational design or selection strategies of ion-exchange media for the satisfactory and successful refolding of a target protein
    Heterologous protein production in the yeast Kluyveromyces lactis
    Ooyen, A.J.J. van; Dekker, P. ; Huang, M. ; Olsthoorn, M.M.A. ; Jacobs, D.I. ; Colussi, P.A. ; Taron, C.H. - \ 2006
    FEMS Yeast Research 6 (2006)3. - ISSN 1567-1356 - p. 381 - 392.
    human serum-albumin - saccharomyces-cerevisiae - molecular-cloning - yarrowia-lipolytica - expression systems - beta-galactosidase - engineered yeasts - secreted proteins - gene-expression - alpha-amylase
    Kluyveromyces lactis is both scientifically and biotechnologically one of the most important non-Saccharomyces yeasts. Its biotechnological significance builds on its history of safe use in the food industry and its well-known ability to produce enzymes like lactase and bovine chymosin on an industrial scale. In this article, we review the various strains, genetic techniques and molecular tools currently available for the use of K. lactis as a host for protein expression. Additionally, we present data illustrating the recent use of proteomics studies to identify cellular bottlenecks that impede heterologous protein expression.
    Metabolic Engineering of Mannitol Production in Lactococcus lactis: Influence of Overexpression of Mannitol 1-Phosphate Dehydrogenase in Different Genetic Backgrounds
    Wisselink, H.W. ; Mars, A.E. ; Meer, P. van der; Eggink, G. ; Hugenholtz, J. - \ 2004
    Applied and Environmental Microbiology 70 (2004)7. - ISSN 0099-2240 - p. 4286 - 4292.
    complete genome sequence - lactate-dehydrogenase - lactobacillus-plantarum - acid bacteria - phosphotransferase system - expression systems - protects - nisin - phosphorylation - activation
    To obtain a mannitol-producing Lactococcus lactis strain, the mannitol 1-phosphate dehydrogenase gene (mtlD) from Lactobacillus plantarum was overexpressed in a wild-type strain, a lactate dehydrogenase(LDH)-deficient strain, and a strain with reduced phosphofructokinase activity. High-performance liquid chromatography and 13C nuclear magnetic resonance analysis revealed that small amounts (
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