Christian Larroque

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GFP-tagged proteins are used extensively as biosensors for protein localization and function, but the GFP moiety can interfere with protein properties. An alternative is to indirectly label proteins using intracellular recombinant antibodies (scFvs), but most antibody fragments are insoluble in the reducing environment of the cytosol. From a synthetic(More)
BACKGROUND Colorectal cancer (CRC) is one of the most common causes of cancer death throughout the world. In this work our aim was to study the role of the phosphoserine aminotransferase PSAT1 in colorectal cancer development. RESULTS We first observed that PSAT1 is overexpressed in colon tumors. In addition, we showed that after drug treatment, PSAT1(More)
BACKGROUND Intrabodies are defined as antibody molecules which are ectopically expressed inside the cell. Such intrabodies can be used to visualize or inhibit the targeted antigen in living cells. However, most antibody fragments cannot be used as intrabodies because they do not fold under the reducing conditions of the cell cytosol and nucleus. RESULTS(More)
We recently reported on the over-expression of a new gene, colonic and hepatic tumor over-expressed gene (ch-TOG) in human hepatomas and colonic tumors. Although ubiquitous in healthy tissues, its expression was found to be particularly elevated in the brain. In the present study, we demonstrate the expression of ch-TOG mRNA in human brain tumors as well as(More)
The release of cytochrome c from the mitochondrial intermembrane space is a decisive event in programmed cell death. Once in the cytoplasm, cytochrome c is involved in the formation of the macromolecular complex termed apoptosome, which activates procaspase-9 which in turn activates downstream procaspase-3. There are increasing evidence indicating that(More)
The high specificity of antibodies for their antigen allows a fine discrimination of target conformations and post-translational modifications, making antibodies the first choice tool to interrogate the proteome. We describe here an approach based on a large-scale intracellular expression and selection of antibody fragments in eukaryotic cells, so-called(More)
BACKGROUND In Huntington's disease (HD), the ratio between normal and mutant Huntingtin (polyQ-hHtt) is crucial in the onset and progression of the disease. As a result, addition of normal Htt was shown to improve polyQ-hHtt-induced defects. Therefore, we recently identified, within human Htt, a 23aa peptide (P42) that prevents aggregation and(More)
GFP-tagged proteins are used extensively as biosensors for protein localization and function, but the GFP moiety can interfere with protein properties. An alternative is to indirectly label proteins using intracellular recombinant antibodies (scFvs), but most antibody fragments are insoluble in the reducing environment of the cytosol. From a synthetic(More)
Though the pharmacological activity of curcumin inhibiting the proliferation of certain cancer cells in culture was demonstrated, its effect on early-stage modifications induced in cell mechanics influencing hereby cell growth and cell adhesion are still questionable. We investigate the morphology and the elastic properties of live cultured, non-malignant(More)
Polyglutamylation is a posttranslational modification that generates glutamate side chains on tubulins and other proteins. Although this modification has been shown to be reversible, little is known about the enzymes catalyzing deglutamylation. Here we describe the enzymatic mechanism of protein deglutamylation by members of the cytosolic carboxypeptidase(More)
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