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Design and synthesis of novel thiadiazole-thiazolone hybrids as potential inhibitors of the human mitotic kinesin Eg5

Khathi, SP; Chandrasekaran, B; Karunanidhi, S; Tham, CL; Kozielski, F; Sayyad, N; Karpoormath, R; (2018) Design and synthesis of novel thiadiazole-thiazolone hybrids as potential inhibitors of the human mitotic kinesin Eg5. Bioorganic and Medicinal Chemistry Letters , 28 (17) pp. 2930-2938. 10.1016/j.bmcl.2018.07.007. Green open access

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Abstract

A novel series of 1,3,4-thiadiazole-thiazolone hybrids 5a–v were designed, synthesized, characterized, and evaluated against the basal and the microtubule (MT)-stimulated ATPase activity of Eg5. From the evaluated derivatives, 5h displayed the highest inhibition with an IC50value of 13.2 µM against the MT-stimulated Eg5 ATPase activity. Similarly, compounds 5f and 5i also presented encouraging inhibition with IC50of 17.2 µM and 20.2 µM, respectively. A brief structure–activity relationship (SAR) analysis indicated that 2-chloro and 4-nitro substituents on the phenyl ring of the thiazolone motif contributed significantly to enzyme inhibition. An in silico molecular docking study using the crystal structure of Eg5 further supported the SAR and reasoned the importance of crucial molecular protein–ligand interactions in influencing the inhibition of the ATPase activity of Eg5. The magnitude of the electron-withdrawing functionalities over the hybrids and the critical molecular interactions contributed towards higher in vitro potency of the compounds. The drug-like properties of the synthesized compounds 5a–v were also calculated based on the Lipinski's rule of five and in silico computation of key pharmacokinetic parameters (ADME). Thus, the present work unveils these hybrid molecules as novel Eg5 inhibitors with promising drug-like properties for future development.

Type: Article
Title: Design and synthesis of novel thiadiazole-thiazolone hybrids as potential inhibitors of the human mitotic kinesin Eg5
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.bmcl.2018.07.007
Publisher version: http://doi.org/10.1016/j.bmcl.2018.07.007
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: 1,3,4-thiadiazole-thiazolone, MT-stimulated ATPase of Eg5, Hybridization, Knoevenagel condensation, GLIDE, ADME prediction
UCL classification: UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > UCL School of Pharmacy
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > UCL School of Pharmacy > Pharma and Bio Chemistry
URI: https://discovery.ucl.ac.uk/id/eprint/10057002
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