Angelika Escher

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Luciferase (Lux)-encoding sequences are very useful as reporter genes. However, a drawback when applying Vibrio harveyi Lux as a reporter enzyme in eukaryotic cells, is that it is a heterodimeric enzyme, thus requiring simultaneous synthesis of both Lux subunits to be active. To overcome this disadvantage, luxA and luxB genes encoding the A and B subunits(More)
Magnetic resonance imaging (MRI) is the gold standard for the detection of multiple sclerosis (MS) lesions. However, current MRI techniques provide little information about the structural features of a brain lesion with inflammatory cell infiltration, demyelination, gliosis, acute axonal damage and axonal loss. To identify methods for a differentiation of(More)
A 2.2-kilobase-pair (kbp) DNA fragment from Vibrio harveyi contains the luxA and luxB genes separated by a 26-base-pair (bp) intergenic region. The two genes were converted to a single open reading frame by site-specific mutagenesis. A full-length fusion protein is obtained when the new gene is placed under transcriptional control of a T7 promoter in(More)
We have previously reported the construction of a functional Renilla luciferase enzyme secreted by mammalian cells when fused to the signal peptide of human interleukin-2. The presence of three predicted cysteine residues in the amino acid sequence of Renilla luciferase suggested that its secreted form could contain oxidized sulfhydryls, which might impair(More)
The soft coral Renilla reniformis luciferase enzyme is a monomeric soluble intracellular protein that is used increasingly as a marker of gene expression. Here the Renilla luciferase gene was engineered to encode a protein product secreted by mammalian cells. The 5' end of the Renilla luciferase gene was fused in frame with the 3' end of a short DNA(More)
PI3Ks control signal transduction triggered by growth factors and G-protein-coupled receptors and regulate an array of biological processes, including cellular proliferation, differentiation, survival and migration. Herein, we investigated the role of PI3Kγ in the pathogenesis of EAE. We show that, in the absence of PI3Kγ expression, clinical signs of EAE(More)
The amyloid beta-protein (Abeta) is the main component of Alzheimer's disease-related senile plaques. Although Abeta is associated with the development of Alzheimer's disease, it has not been shown which forms of Abeta induce neurodegeneration in vivo and which types of neurons are vulnerable. To address these questions, we implanted DiI crystals into the(More)
The heat shock genes of Bacillus subtilis are assigned to four classes on the basis of their regulation mechanisms. While classes I and III are negatively controlled by two different transcriptional repressors, class II is regulated by the alternative sigma factor sigma(B). All heat shock genes with unidentified regulatory mechanisms, among them htpG,(More)
The folding kinetics of two luciferases were studied after synthesis in reticulocyte lysates to investigate whether molecular chaperones and/or folding catalysts are involved in the folding reactions. Two bacterial luciferases were used as model proteins: heterodimeric Vibrio harveyi luciferase (LuxAB), and a monomeric luciferase fusion protein (Fab2). Data(More)
The nucleotide sequence of the luxA and luxB genes encoding the alpha beta heterodimeric luciferase from thermotolerant Vibrio harveyi CTP5 was determined. The DNA sequence of the CTP5 luxA and luxB genes is identical to the DNA sequence of the luxA and luxB genes from mesophilic V. harveyi MAV (B 392), with minor exceptions. The sequence differences result(More)