24 research outputs found

    Weiterentwicklung des hessischen "Leitfadens zum Erkennen ökologisch kritischer Gewässerbelastungen durch Abwassereinleitungen". Entwicklung einer simulationsgestützten Analyse- und Planungsmethodik

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    Der hessische "Leitfaden zum Erkennen ökologisch kritischer Gewässerbelastungen durch Abwassereinleitungen" soll weiterentwickelt werden. In diesem Zusammenhang wurde das Fachgebiet "Ingenieurhydrologie und Wasserbewirtschaftung" der TU Darmstadt mit der Entwicklung eines integrierten Ansatzes zur immissionsorientierten Beurteilung urbaner Entwässerungssysteme beauftragt. Nach Abschluss des Vorhabens soll ein Instrument für die Beurteilung der Auswirkungen von Abwassereinleitungen aus urbanen Entwässerungssystemen auf die Gewässer in Form eines neuen Leitfadens zur Verfügung gestellt werden

    Weiterentwicklung des hessischen "Leitfadens zum Erkennen ökologisch kritischer Gewässerbelastungen durch Abwassereinleitungen". Entwicklung einer simulationsgestützten Analyse- und Planungsmethodik

    No full text
    Der hessische "Leitfaden zum Erkennen ökologisch kritischer Gewässerbelastungen durch Abwassereinleitungen" soll weiterentwickelt werden. In diesem Zusammenhang wurde das Fachgebiet "Ingenieurhydrologie und Wasserbewirtschaftung" der TU Darmstadt mit der Entwicklung eines integrierten Ansatzes zur immissionsorientierten Beurteilung urbaner Entwässerungssysteme beauftragt. Nach Abschluss des Vorhabens soll ein Instrument für die Beurteilung der Auswirkungen von Abwassereinleitungen aus urbanen Entwässerungssystemen auf die Gewässer in Form eines neuen Leitfadens zur Verfügung gestellt werden

    DESIGN, SYNTHESIS AND CHARACTERISATION OF A NOVEL TYPE II B-RAF PARADOX BREAKER INHIBITOR

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    International audienceThe mutation V600E in B-Raf leads to MAPK pathway activation, uncontrolled cell proliferation, and tumorigenesis. ATP competitive type I B-Raf inhibitors, such as vemurafenib (1) and PLX4720 (4) efficiently block the MAPK pathways in B-Raf mutant cells, however these inhibitors induce conformational changes in the wild type B-Raf (wt B-Raf) kinase domain leading to heterodimerisation with C-Raf, causing paradoxical hyperactivation of the MAPK pathway. This unwanted activation may be avoided by another class of inhibitors (type II) which bind the kinase in the DFG-out conformation, such as AZ628 (3) preventing heterodimerization. Here we present a new B-Raf kinase domain inhibitor that represents a hybrid between 4 and 3. This novel inhibitor borrows the hinge binding region from 4 and the back pocket binding moiety from 3. We designed, synthesized, determined its binding mode, performed activity/selectivity studies, and molecular dynamics simulations in order to study the conformational effects induced by this inhibitor on wt and V600E mutant B-Raf kinase. We discovered that the inhibitor binds in a DFG-out/αC-helix-in conformation, did not induce the aforementioned paradoxical hyperactivation in the MAPK pathway, and it was active and highly selective for B-Raf. We propose that this merging approach can be used to design a novel class of B-Raf inhibitors for translational studies

    Chemical proteomic analysis reveals alternative modes of action for pyrido[2,3-d]pyrimidine kinase inhibitors

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    Small molecule inhibitors belonging to the pyrido[2,3-d]pyrimidine class of compounds were developed as antagonists of protein tyrosine kinases implicated in cancer progression. Derivatives from this compound class are effective against most of the imatinib mesylate-resistant BCR-ABL mutants isolated from advanced chronic myeloid leukemia patients. Here, we established an efficient proteomics method employing an immobilized pyrido[2,3-d]pyrimidine ligand as an affinity probe and identified more than 30 human protein kinases affected by this class of compounds. Remarkably, in vitro kinase assays revealed that the serine/threonine kinases Rip-like interacting caspase-like apoptosis-regulatory protein kinase (RICK) and p38α were among the most potently inhibited kinase targets. Thus, pyrido[2,3-d]pyrimidines did not discriminate between tyrosine and serine/threonine kinases. Instead, we found that these inhibitors are quite selective for protein kinases possessing a conserved small amino acid residue such as threonine at a critical site of the ATP binding pocket. We further demonstrated inhibition of both p38 and RICK kinase activities in intact cells upon pyrido[2,3-d]pyrimidine inhibitor treatment. Moreover, the established functions of these two kinases as signal transducers of inflammatory responses could be correlated with a potent in vivo inhibition of cytokine production by a pyrido[2,3-d]pyrimidine compound. Thus, our data demonstrate the utility of proteomic methods employing immobilized kinase inhibitors for identifying new targets linked to previously unrecognized therapeutic applications
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