Kenfack Sipoho, Annicet (2023)
Natural Products as Kinase Inhibitors: Total Synthesis, in Vitro Kinase Activity, in Vivo Toxicology in Zebrafish Embryos and in Silico Docking.
Technische Universität Darmstadt
doi: 10.26083/tuprints-00026366
Ph.D. Thesis, Primary publication, Publisher's Version
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Item Type: | Ph.D. Thesis | ||||
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Type of entry: | Primary publication | ||||
Title: | Natural Products as Kinase Inhibitors: Total Synthesis, in Vitro Kinase Activity, in Vivo Toxicology in Zebrafish Embryos and in Silico Docking | ||||
Language: | English | ||||
Referees: | Schmidt, Prof. Dr. Boris ; Hausch, Prof. Dr. Felix | ||||
Date: | 29 November 2023 | ||||
Place of Publication: | Darmstadt | ||||
Collation: | xvi, 333 Seiten | ||||
Date of oral examination: | 13 November 2023 | ||||
DOI: | 10.26083/tuprints-00026366 | ||||
Abstract: | Despite significant progress in developing small molecule kinase inhibitors, most human kinases still lack high-quality selective inhibitors that might be employed as chemical probes to study their biological function and pharmacology. Natural products (NPs) and their synthetic derivates might give avenues to overcome this frequently encountered challenge as they demonstrated to target a wide range of kinases, including all subfamilies of the known kinome. Nonetheless, isolating these NPs from their sources necessitates massive harvesting, which is fraught with difficulties and triggers enormous harm to the ecology. Moreover, the challenges encountered while extracting these NPs from their sources are constantly present and have few viable solutions. Considering these aspects, total synthesis and semisynthesis have been employed to replicate the most intriguing compounds of living nature in laboratories to obtain larger quantities for extended studies. The present work outlined the attempts to perform the first total syntheses and to evaluate the biological activity of naturally occurring potent anti-cancer compounds: Depsipeptide PM181110, Eudistomidin C, and Fusarithioamide A. Efforts to achieve the first total syntheses of these natural compounds have been based on highly convergent and unified approaches. Depsipeptide PM181110 is a bicyclic depsipeptide featuring four stereogenic centres whose attempts to perform its first total synthesis were undertaken by synthesizing its diastereomers 3R,9R,14R,17R, and 3R,9S,14R,17R. Similarly, for Eudistomidin C and Fusarithioamide A having known stereochemistry, the attempts to perform their syntheses were made starting from enantiomerically pure reagents. The synthesized compounds BSc5484, BSc5517 and the analogues were subjected to biological activity tests afterwards. Accordingly, a kinase inhibitory activity test was performed, followed by an in vivo toxicology assay in wild-type and gold-type zebrafish embryos Danio rerio. As a result, the assayed compounds displayed moderate to good inhibition of the kinases with an apparent selectivity profile and toxicity in zebrafish embryos illustrated by the observed phenotypes. Finally, an in silico experiment revealed that BSc5484 and BSc5485 might bind as type IV inhibitors, while BSc5517 demonstrated a better binding affinity to human Haspin kinase compared to the known b-carboline inhibitor Harmine across the panel of the tested kinases. This work thus provides the first directed tools about the potential of naturally derived compounds as inhibitors of disease-causing proteins that are key players in numerous forms of cancer and other illnesses. Consequently, establishing depsipeptide and b-carboline-based compounds as therapeutic leads is crucial and will provide a powerful tool to further elucidate their biological function through targeted structural variations. |
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Status: | Publisher's Version | ||||
URN: | urn:nbn:de:tuda-tuprints-263665 | ||||
Classification DDC: | 500 Science and mathematics > 540 Chemistry | ||||
Divisions: | 07 Department of Chemistry > Clemens-Schöpf-Institut > Organ Chemistry | ||||
Date Deposited: | 29 Nov 2023 12:11 | ||||
Last Modified: | 01 Dec 2023 10:21 | ||||
URI: | https://tuprints.ulb.tu-darmstadt.de/id/eprint/26366 | ||||
PPN: | 513575413 | ||||
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