Helga Schinkel

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15N natural abundances of soil total N, roots and mycorrhizas were studied in surface soil profiles in coniferous and broadleaved forests along a transect from central to northern Europe. Under conditions of N limitation in Sweden, there was an increase in δ15N of soil total N of up to 9% from the uppermost horizon of the organic mor layer down to the upper(More)
The high fibrin specificity of Desmodus rotundus salivary plasminogen activator alpha1 (DSPAalpha1 or desmoteplase (INN)) makes it a promising candidate for the treatment of acute ischemic stroke. In the current study we explored the use of transgenic tobacco plants and BY-2 suspension cells as alternative production platforms for this drug. Four different(More)
Several isoforms of superoxide dismutase (SOD) with a high isoelectric point (pI) have been identified by isoelectric focusing chromatography in protein extracts from Scots pine (Pinus sylvestris) needles. One of these isoforms, a CuZn-SOD with a pI of about 10 and thus denoted hipI-SOD, has been isolated and purified to apparent homogeneity. A cDNA(More)
We used the interaction between an epitope of the Tobacco mosaic virus 54K replicase (tag54) and its corresponding monoclonal antibody 54 (mAb54) for the design of a new epitope-tagging system. We fused the DNA sequence of tag54 and two elongated derivates thereof to the C-terminus of the chloramphenicol acetyltransferase (CAT) gene and produced the tagged(More)
which is involved in lignification of cell walls (Dean and Eriksson, 1992), defence reactions against microbial infecExtracellular superoxide dismutase was found in extrations (Levine et al., 1994) and cross-linking of structural xylematic bark tissues and seedlings of Pinus sylproteins of the cell wall (Bradley et al., 1992). Its generavestris L. The(More)
Transgenic hybrid aspen (Populus tremula L. x P. tremuloides Michx.) plants expressing a high-isoelectric-point superoxide dismutase (hipI-SOD) gene in antisense orientation were generated to investigate its function. Immunolocalization studies showed the enzyme to be localized extracellularly, in the secondary cell wall of xylem vessels and phloem fibers.(More)
We report the generation of the first monoclonal antibody that specifically binds to the polysaccharide chitosan. Mice were immunized with a mixture of chitosans, and hybridoma clones were screened for specific binders resulting in the isolation of a single clone secreting a chitosan-specific IgM, mAbG7. In ELISAs, the antibody can bind to chitosans of(More)
Several CuZn-superoxide dismutases (SODs; EC were cloned from hybrid aspen (Populus tremula L. × tremuloides Michx.). Two of the cloned genes encode representatives of a novel type of CuZn-SOD and we named it HipI-SOD because of its high isoelectric point (≥9). The SODs were cloned by screening a cDNA library with a probe based on a Scots pine(More)
Thrombomodulin is a membrane-bound protein that plays an active role in the blood coagulation system by binding thrombin and initiating the protein C anticoagulant pathway. Solulin™ is a recombinant soluble derivative of human thrombomodulin. It is used for the treatment of thrombotic disorders. To evaluate the production of this pharmaceutical protein in(More)
Plant cell suspension cultures can be used for the production of recombinant pharmaceutical proteins, but their potential is limited by modest production levels that may be unstable over long culture periods, reflecting initial culture heterogeneity and subsequent genetic and epigenetic changes. We used flow sorting to generate highly productive monoclonal(More)