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5. Development of 1,2,4-Oxadiazoles as Potent and Selective Inhibitors of the Human Deacetylase Sirtuin 2: Structure–Activity Relationship, X-ray Crystal Structure, and Anticancer Activity

Author

Moniot, Sébastien, primary, Forgione, Mariantonietta, additional, Lucidi, Alessia, additional, Hailu, Gebremedhin S., additional, Nebbioso, Angela, additional, Carafa, Vincenzo, additional, Baratta, Francesca, additional, Altucci, Lucia, additional, Giacché, Nicola, additional, Passeri, Daniela, additional, Pellicciari, Roberto, additional, Mai, Antonello, additional, Steegborn, Clemens, additional, and Rotili, Dante, additional

Published
2017
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6. Development of 1,2,4-Oxadiazoles as Potent and Selective Inhibitors of the Human Deacetylase Sirtuin 2: Structure-Activity Relationship, X-ray Crystal Structure, and Anticancer Activity

Author

Francesca Baratta, Clemens Steegborn, Mariantonietta Forgione, Vincenzo Carafa, Angela Nebbioso, Daniela Passeri, Gebremedhin Solomon Hailu, Dante Rotili, Nicola Giacchè, Roberto Pellicciari, Sébastien Moniot, Lucia Altucci, Antonello Mai, Alessia Lucidi, Moniot, Sébastien, Forgione, Mariantonietta, Lucidi, Alessia, Hailu, Gebremedhin S, Nebbioso, Angela, Carafa, Vincenzo, Baratta, Francesca, Altucci, Lucia, Giacché, Nicola, Passeri, Daniela, Pellicciari, Roberto, Mai, Antonello, Steegborn, Clemen, and Rotili, Dante

Subjects
Models, Molecular, 0301 basic medicine, Stereochemistry, Antineoplastic Agents, Apoptosis, Peptide, Crystallography, X-Ray, mammalian sirtuins, tumor-suppressor, Parkinsons-disease, emerging role, cell-cycle, discovery, targets, design, cancer, tumorigenesis, SIRT2, 01 natural sciences, Structure-Activity Relationship, 03 medical and health sciences, Sirtuin 2, Western blot, Cell Line, Tumor, Neoplasms, Drug Discovery, medicine, Humans, Structure–activity relationship, chemistry.chemical_classification, Oxadiazoles, biology, U937 cell, medicine.diagnostic_test, 010405 organic chemistry, Chemistry, 3. Good health, 0104 chemical sciences, 030104 developmental biology, Biochemistry, Sirtuin, biology.protein, Molecular Medicine, NAD+ kinase
Abstract

Sirt2 is a target for the treatment of neurological, metabolic, and age-related diseases including cancer. Here we report a series of Sirt2 inhibitors based on the 1,2,4-oxadiazole scaffold. These compounds are potent Sirt2 inhibitors active at single-digit μM level by using the Sirt2 substrate α-tubulin-acetylLys40 peptide and inactive up to 100 μM against Sirt1, -3, and -5 (deacetylase and desuccinylase activities). Their mechanism of inhibition is uncompetitive toward both the peptide substrate and NAD(+), and the crystal structure of a 1,2,4-oxadiazole analog in complex with Sirt2 and ADP-ribose reveals its orientation in a still unexplored subcavity useful for further inhibitor development. Tested in leukemia cell lines, 35 and 39 induced apoptosis and/or showed antiproliferative effects at 10 or 25 μM after 48 h. Western blot analyses confirmed the involvement of Sirt2 inhibition for their effects in NB4 and in U937 cells. Our results provide novel Sirt2 inhibitors with a compact scaffold and structural insights for further inhibitor improvement.

Published
2017

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