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Adav, S.S. (author), Li, A.A. (author), Manavalan, A. (author), Punt, P. (author), Sze, S.K. (author), TNO Kwaliteit van Leven (author)The natural lifestyle of Aspergillus niger made them more effective secretors of hydrolytic proteins and becomes critical when this species were exploited as hosts for the commercial secretion of heterologous proteins. The protein secretion profile of A. niger and its mutant at different pH was explored using iTRAQ-based quantitative proteomics...article 2010
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van Leeuwen, S.S. (author), Kralj, S. (author), Eeuwema, W. (author), Gerwig, G.J. (author), Dijkhuizen, L. (author), Kamerling, J.P. (author)Mutagenesis of specific amino acid residues of the glucansucrase (GTF180) enzyme from Lactobacillus reuteri strain 180 yielded 12 mutant enzymes that produced modified exopolysaccharides (mEPSs) from sucrose. Ethanol-precipitated and purified mEPSs were subjected to linkage analysis, Smith degradation analysis, and 1D/2D <sup>1</sup>H NMR...article 2009
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Hu, C. (author), van Dommelen, J. (author), van der Heijden, R. (author), Spijksma, G. (author), Reijmers, T.H. (author), Wang, M. (author), Slee, E. (author), Lu, X. (author), Xu, G. (author), van der Greef, J. (author), Hankemeier, T. (author), TNO Kwaliteit van Leven (author)A reversed-phase liquid chromatography-linear ion trap-Fourier transform ion cyclotron resonance-mass spectrometry method was developed for the profiling of lipids in human and mouse plasma. With the use of a fused-core C<sub>8</sub> column and a binary gradient, more than 160 lipids belonging to eight different classes were detected in a single...article 2008
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Damveld, R.A. (author), Franken, A. (author), Arentshorst, M. (author), Punt, P.J. (author), Klis, F.M. (author), van den Hondel, C.A.M.J.J. (author), Ram, A.F.J. (author), TNO Kwaliteit van Leven (author)To identify cell wall biosynthetic genes in filamentous fungi and thus potential targets for the discovery of new antifungals, we developed a novel screening method for cell wall mutants. It is based on our earlier observation that the Aspergillus niger agsA gene, which encodes a putative a-glucan synthase, is strongly induced in response to...article 2008
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Wierckx, N.J.P. (author), Ballerstedt, H. (author), de Bont, J.A.M. (author), de Winde, J.H. (author), Ruijssenaars, H.J. (author), Wery, J. (author), TNO Kwaliteit van Leven (author)The unknown genetic basis for improved phenol production by a recombinant Pseudomonas putida S12 derivative bearing the tpl (tyrosine-phenol lyase) gene was investigated via comparative transcriptomics, nucleotide sequence analysis, and targeted gene disruption. We show upregulation of tyrosine biosynthetic genes and possibly decreased...article 2008
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Punt, P.J. (author), Schuren, F.H.J. (author), Lehmbeck, J. (author), Christensen, T. (author), Hjort, C. (author), van den Hondel, C.A.M.J.J. (author), TNO Kwaliteit van Leven (author)Expression of several Aspergillus niger genes encoding major secreted, but not vacuolar, protease genes including the major acid protease gene pepA, was shown to be affected in the previously isolated A. niger protease mutant, AB1.13 [Mattern, I.E., van Noort, J.M., van den Berg, P., Archer, D.A., Roberts, I.N., Hondel, C.A.M.J.J., 1992....article 2008
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TNO Kwaliteit van Leven (author), Hu, L. (author), van der Hoogt, C.C. (author), Espirito Santo, S.M.S. (author), Out, R. (author), Kypreos, K.E. (author), van Vlijmen, B.J.M. (author), van Berkel, T.J.C. (author), Romijn, J.A. (author), Havekes, L.M. (author), van Dijk, K.W. (author), Rensen, P.C.N. (author)LPL activity plays an important role in preceding the VLDL remnant clearance via the three major apolipoprotein E (apoE)-recognizing receptors: the LDL receptor (LDLr), LDL receptor-related protein (LRP), and VLDL receptor (VLDLr). The aim of this study was to determine whether LPL activity is also important for VLDL remnant clearance...article 2008
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TNO Kwaliteit van Leven (author), Gerritsen, G. (author), van der Hoogt, C.C. (author), Schaap, F.G. (author), Voshol, P.J. (author), Kypreos, K.E. (author), Maeda, N. (author), Groen, A.K. (author), Havekes, L.M. (author), Rensen, P.C.N. (author), van Dijk, K.W. (author)Apolipoprotein E2 (apoE2)-associated hyperlipidemia is characterized by a disturbed clearance of apoE2-enriched VLDL remnants. Because excess apoE2 inhibits LPL-mediated triglyceride (TG) hydrolysis in vitro, we in vestigated whether direct or indirect stimulation of LPL activity in vivo reduces the apoE2-associated hypertriglyc-eridemia. Here,...article 2008
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Nijkamp, K. (author), Westerhof, R.G.M. (author), Ballerstedt, H. (author), de Bont, J.A.M. (author), Wery, J. (author), TNO Kwaliteit van Leven (author)A Pseudomonas putida S12 strain was constructed that is able to convert glucose to p-coumarate via the central metabolite l-tyrosine. Efficient production was hampered by product degradation, limited cellular L-tyrosine availability, and formation of the by-product cinnamate via L-phenylalanine. The production host was optimized by inactivation...article 2007
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Pires, N.M.M. (author), Eefting, D. (author), de Vries, M.R. (author), Quax, P.H.A. (author), Jukema, J.W. (author), TNO Kwaliteit van Leven (author)Background: Drug-eluting stents (DES) have been introduced successfully in clinical practice to prevent post angioplasty restenosis. Nevertheless, concerns about the safety of DES still exist. Objective: To investigate the vascular pathology and transcriptional responses to sirolimus and paclitaxel in a murine model for restenosis on underlying...article 2007
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TNO Kwaliteit van Leven (author), Westerterp, M. (author), Berbée, J.F.P. (author), Pires, N.M.M. (author), van Mierlo, G.J.D. (author), Kleemann, R. (author), Romijn, J.A. (author), Havekes, L.M. (author), Rensen, P.C.N. (author)BACKGROUND - Lipopolysaccharide (LPS), which is released from Gram-negative bacteria on multiplication or lysis, aggravates atherosclerosis in humans and rodents by inducing inflammation via toll-like receptors. Because apolipoprotein C-I (apoCI) enhances the LPS-induced inflammatory response in macrophages in vitro and in mice, we investigated...article 2007
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TNO Kwaliteit van Leven (author), Alkemade, F.E. (author), de Gittenberger-Groot, A.C. (author), Schiel, A.E. (author), van Munsteren, J.C. (author), Hogers, B. (author), van Vliet, L.S.J. (author), Poelmann, R.E. (author), Havekes, L.M. (author), van Dijk, K.W. (author), de Ruiter, M.C. (author)OBJECTIVE - Maternal hypercholesterolemia is associated with a higher incidence and faster progression of atherosclerotic lesions in neonatal offspring. We aimed to determine whether an in utero environment exposing a fetus to maternal hypercholesterolemia and associated risk factors can prime the murine vessel wall to accelerated development of...article 2007
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TNO Kwaliteit van Leven (author), van der Horst, M.A. (author), Arents, J.C. (author), Kort, R. (author), Hellingwerf, K.J. (author)The bacterial photoreceptor protein photoactive yellow protein (PYP) covalently binds the chromophore 4-hydroxy coumaric acid, tuning (spectral) characteristics of this cofactor. Here, we study this binding and tuning using a combination of pointmutations and chromophore analogs. In all photosensor proteins studied to date the covalent linkage...article 2007
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Berbée, J.F. (author), van der Hoogt, C.C. (author), Kleemann, R. (author), Schippers, E.F. (author), Kitchens, R.L. (author), van Dissel, J.T. (author), Bakker-Woudenberg, I.A. (author), Havekes, L.M. (author), Rensen, P.C. (author), TNO Kwaliteit van Leven (author)Gram-negative sepsis is a major death cause in intensive care units. Accumulating evidence indicates the protective role of plasma lipoproteins such as high-density lipoprotein (HDL) in sepsis. It has recently been shown that septic HDL is almost depleted from apolipoprotein CI (apoCI), suggesting that apoCI may be a protective factor in sepsis....article 2006
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Gray, S.L. (author), Dalla Nora, E. (author), Grosse, J. (author), Manieri, M. (author), Stoeger, T. (author), Medina-Gomez, G. (author), Burling, K. (author), Wattler, S. (author), Russ, A. (author), Yeo, G.S.H. (author), Chatterjee, V.K. (author), O'Rahilly, S. (author), Voshol, P.J. (author), Cinti, S. (author), Vidal-Puig, A. (author), TNO Preventie en Gezondheid (author)Peroxisome proliferator-activated receptor (PPAR)γ is a key transcription factor facilitating fat deposition in adipose tissue through its proadipogenic and lipogenic actions. Human patients with dominant-negative mutations in PPARγ display lipodystrophy and extreme insulin resistance. For this reason it was completely unexpected that mice...article 2006
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Weenink, X.O. (author), Punt, P.J. (author), van den Hondel, C.A.M.J.J. (author), Ram, A.F.J. (author), TNO Kwaliteit van Leven (author)Although filamentous fungi have a unique property of secreting a large amount of homologous extracellular proteins, the use of filamentous fungi as hosts for the production of heterologous proteins is limited because of the low production levels that are generally reached. Here, we report a general screening method for the isolation of mutants...article 2006
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Wang, C. (author), Chou, Y.K. (author), Rich, C.M. (author), Link, J.M. (author), Afentoulis, M.E. (author), van Noort, J.M. (author), Wawrousek, E.F. (author), Offner, H. (author), van den Bark, A.A. (author), TNO Kwaliteit van Leven (author)Alpha B-crystallin (αB) is a small heat shock protein that is strongly up-regulated in multiple sclerosis (MS) brain tissue, and can induce strong T cell responses. Assessing a potential encephalitogenic function for αB protein in MS and experimental autoimmune encephalomyelitis (EAE) has been challenging due to its ubiquitous expression that...article 2006
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Post, S.M. (author), Groenendijk, M. (author), van der Hoogt, C.C. (author), Fievet, C. (author), Luc, G. (author), Hoekstra, M. (author), Princen, H.M.G. (author), Staels, B. (author), Rensen, P.C.N. (author), TNO Kwaliteit van Leven (author)OBJECTIVE - High-density lipoprotein (HDL) plays a key role in protection against development of atherosclerosis by reducing inflammation, protecting against LDL oxidation, and promoting reverse cholesterol transport from peripheral tissues to the liver for secretion into bile. Cholesterol 7α-hydroxylase (Cyp7a1) catalyzes the rate-limiting step...article 2006
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TNO Kwaliteit van Leven TNO Voeding (author), Ozimek, L.K. (author), Kralj, S. (author), Kaper, T. (author), van der Maarel, M.J.E.C. (author), Dijkhuizen, L. (author)Bacterial fructansucrase enzymes belong to glycoside hydrolase family 68 and catalyze transglycosylation reactions with sucrose, resulting in the synthesis of fructooligosaccharides and/or a fructan polymer. Significant differences in fructansucrase enzyme product specificities can be observed, i.e. in the type of polymer (levan or inulin)...article 2006
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TNO Defensie en Veiligheid (author), Kieboom, J. (author), Abee, T. (author)Salmonella enterica serovar Typhimurium does not survive a pH 2.5 acid challenge under conditions similar to those used for Escherichia coli (J. W. Foster, Nat. Rev. Microbiol. 2:898-907, 2004). Here, we provide evidence that S. enterica serovar Typhimurium can display arginine-dependent acid resistance (AM) provided the cells are grown under...article 2006