Stefan Bell

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The human tumor suppressor protein p53 is understood only to some extent on a structural level. We performed a comprehensive biochemical and biophysical structure-function analysis of p53 full-length protein and p53 fragments. The analysis showed that p53 and the fragments investigated form stable functional units. Full-length p53 and the tetrameric(More)
The non-covalent homodimer formed by the C-terminal domains of the IgG1 heavy chains (C(H)3) is the simplest naturally occurring model system for studying immunoglobulin folding and assembly. In the native state, the intrachain disulfide bridge, which connects a three-stranded and a four-stranded beta-sheet is buried in the hydrophobic core of the protein.(More)
The insulin-receptor binding activity and insulin-stimulated growth response of PC13 clone 5 cells were investigated for both the embryo carcinoma (EC) and retinoic acid-induced differentiated derivatives of this cell line. Whereas the EC cell was found to have very few, if any, receptors and showed no demonstrable dependence on insulin for growth, the(More)
The human tumor suppressor p53 is a conformationally flexible and functionally complex protein that is only partially understood on a structural level. We expressed full-length p53 in the cytosol of Escherichia coli as inclusion bodies. To obtain active, recombinant p53, we varied renaturation conditions using DNA binding activity and oligomeric state as(More)
BiP is an Hsp70 homologue found in the endoplasmic reticulum of eukaryotic cells. Like other Hsp70 chaperones, BiP interacts with its substrate proteins in an ATP-dependent manner. The functional analysis has so far been performed mainly with short, synthetic peptides. Here, we present an experimental system that allows to study the partial reactions of the(More)
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