Docking Studies and Synthesis of Novel 4- Thiazolidinone Derivatives Bearing 1, 3, 4- Oxadiazole Moiety as SIRT-3 Activators Targeting Parkinson’s Disease (original) (raw)
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European journal of medicinal chemistry, 2014
Two series of novel benzimidazole derivatives were designed, synthesized and evaluated for their SIRT1 and SIRT2 inhibitory activity. Among the newly synthesized compounds, compound 4j displayed the best inhibitory activity for SIRT1 (IC50 = 54.21 μM) as well as for SIRT2 (IC50 = 26.85 μM). Cell proliferation assay showed that compound 4j possessed good antitumor activity against three different types of cancer cells derived from colon (HCT-116), breast (MDA-MB-468) and blood-leukemia (CCRF-CEM) with cell viability of 40.0%, 53.2% and 27.2% respectively at 50 μM. Docking analysis of representative compound 4j into SIRT2 indicated that the interaction with receptor was primarily due to hydrogen bonding and π-π stacking interactions.
Discovery of Imidazo[1,2- b ]thiazole Derivatives as Novel SIRT1 Activators
Journal of Medicinal Chemistry, 2009
A series of imidazo [1,2-b]thiazole derivatives is shown to activate the NAD + -dependent deacetylase SIRT1, a potential new therapeutic target to treat various metabolic disorders. This series of compounds was derived from a high throughput screening hit bearing an oxazolopyridine core. Water-solubilizing groups could be installed conveniently at either the C-2 or C-3 position of the imidazo[1,2-b]thiazole ring. The SIRT1 enzyme activity could be adjusted by modifying the amide portion of these imidazo[1,2-b]thiazole derivatives. The most potent analogue within this series, namely, compound 29, has demonstrated oral antidiabetic activity in the ob/ob mouse model, the diet-induced obesity (DIO) mouse model, and the Zucker fa/fa rat model.
Novel 3-Arylideneindolin-2-ones as Inhibitors of NAD+-Dependent Histone Deacetylases (Sirtuins)
Journal of Medicinal Chemistry, 2010
Class III histone deacetylases (sirtuins) play pivotal roles in many cellular processes. They are linked to extended lifespan and to the pathogenesis of cancer and neuronal disorders. We present novel sirtuin inhibitors based on a 6,7-dichloro-2-oxindole scaffold with low micromolar activity. In vitro activity was rationalized by docking studies, and hyperacetylation of sirtuin targets could be demonstrated in cell culture.
Owing to its presence in several biological processes Sirt1 served as a potential therapeutic target for many diseases. Here we report the synthesis of two distinct series of novel Sirt1 selective inhibitors, benzimidazole monopeptides and 5-pyrazolyl methylidene rhodanine carboxylic acid derived amino acids, constructed using structure-guided computational approaches. Furthermore, compounds were evaluated, against human Sirt1-3 for in-vitro inhibitory activity compared to Ex527 (reported Sirt1-selective inhibitor), in liver and breast cancer cell lines for cytotoxicity. The tryptophan conjugates 13h (IC50 = 0.66 µM) and 7d (IC50 = 0.77 µM) demonstrated maximum efficacy to inhibit Sirt1. Molecular dynamics simulations unveil the interaction map and electrostatic complementarity at substrate binding site, could be a cause of selective Sirt1 inhibition. Furthermore, the Sirt1 inhibition was monitored via increased p53 acetylation status checked in HepG2 cells. These findings will pave...
Journal of Medicinal Chemistry, 2013
The sirtuins SIRT1, SIRT2, and SIRT3 are NAD + dependent deacetylases that are considered potential targets for metabolic, inflammatory, oncologic, and neurodegenerative disorders. Encoded library technology (ELT) was used to affinity screen a 1.2 million heterocycle enriched library of DNA encoded small molecules, which identified pan-inhibitors of SIRT1/2/3 with nanomolar potency (e.g., 11c: IC 50 = 3.6, 2.7, and 4.0 nM for SIRT1, SIRT2, and SIRT3, respectively). Subsequent SAR studies to improve physiochemical properties identified the potent drug like analogues 28 and 31. Crystallographic studies of 11c, 28, and 31 bound in the SIRT3 active site revealed that the common carboxamide binds in the nicotinamide C-pocket and the aliphatic portions of the inhibitors extend through the substrate channel, explaining the observable SAR. These pan SIRT1/2/3 inhibitors, representing a novel chemotype, are significantly more potent than currently available inhibitors, which makes them valuable tools for sirtuin research.
2021
Sirtuin-6 (SIRT6), class III family of deacetylase regulates several biological functions, including transcriptional repression, telomere maintenance, and DNA repair. It is unique among sirtuin family members with diverse enzymatic functions: mono-ADP-ribosylase, deacetylase and defatty-acylase. The studies so far implicated SIRT6 role in lifespan extension, tumor suppression, and is considered as an attractive drug target for aging-related disease. In this study, we have carried out <i>in silico</i> screening for human SIRT6 modulators using NCI Diversity Set III library, molecular dynamic (MD) simulations to analyze the protein-ligand interaction, and validated their binding-affinity (Kd) using MicroScale Thermophoresis. This study yielded two novel compounds, ((3Z)-3-((4-(dimethylamino)phenyl)methylidene)-5-(5,6,7,8-tetrahydronaphthalen-2-yl)furan-2-one and 5-phenyl-2-(5-phenyl-2,3-dihydro-1,3-benzoxazol-2-yl)-2,3-dihydro-1,3-benzoxazole showing high-affinity interact...
Bioorganic & Medicinal Chemistry, 2014
A total of 15 novel benzimidazole derivatives were designed, synthesized and evaluated for their SIRT1 and SIRT2 inhibitory activity. All compounds showed better inhibition on SIRT2 as compared to SIRT1. Among these, compound 5j displayed the best inhibitory activity for SIRT1 (IC 50 = 58.43 lM) as well as for SIRT2 (IC 50 = 45.12 lM). Cell cytotoxicity assays also showed that compound 5j possesses good antitumor activity against two different cancer cell lines derived from breast cancer (MCF-7 and MDA-MB-468). A simple structure-activity-relationship (SAR) study of the newly synthesized benzimidazole derivatives was also discussed.
Cervical cancer ranks third among the most prevalent deadly cancer in women worldwide and ranks first in developing countries. It is caused by human papilloma virus (HPV) infection. Thus HDACs have become prominent inhibition target for cervical cancer treatment. In order to discover the new alternative HDAC inhibitors (HDACIs), we conducted a computer-aided drug discovery and development (CADDD) based on de novo approach. The compound library is based on 4-[(2-oxo-1,3-thiazolidin-3-yl)carbonyl] aniline. Screening of the best drug leads was evaluated from several parameters, such as docking and interaction analysis, pharmacology, in silico pre-clinical trial and molecular dynamics analysis. The inhibitory activity of these new designed ligands against Homo sapiens class II HDAC was determined by molecular docking simulation. Docking analysis yielded eight best ligands which have better binding affinity than the standards. Therefore, interaction analysis indicated that all best ligands performed coordination with Zn2+ cofactor in HDAC charge-relay system which are essential for HDAC inhibitory activities of these inhibitors. pharmacology analysis and pre-clinical trials of these compounds including pharmacology properties, bioactivity, mutagenicity-carcinogenicity, absorption, distribution, metabolism, excretion and toxicity (ADMET) properties were done through in silico methods. Through this analysis, the best ligands meet Lipinski's rule of five, have a better drug score than standards, and show good bioactivities, oral bioavailability and ADMET properties. All best ligands also have good synthetic accessibility and were proved to be new compounds that have never been synthesized before. Stability of HDAC-ligand complexes was also calculated through molecular dynamics (MD) simulation. Based on this simulation, complex of the best ligands with corresponding HDAC has a good stability based on RMSD (root mean square deviation) and interaction analysis. The study thus reveals eight best ligands (F, Ib14, O38, Kb17, Gd40, Aa50, Gc42 and Bb38) which have better binding affinity against human class II histone deacetylase (HDAC) through molecular docking, dynamics and interaction analysis. The best ligands were also found to have good bioactivities, oral bioavailability and ADMET properties through in silico pharmacology analysis and pre-clinical trial. These compounds were found to have a good synthetic accessibility; therefore they could be synthesized for further biological and clinical test.
Journal of Medicinal Chemistry, 2006
A series of N,N′-bisbenzylidenebenzene-1,4-diamine and N,N′-bisbenzylidenenaphthalene-1,4-diamine derivatives were synthesized as inhibitors for human sirtuin type 2 (SIRT2). The design of the new compounds was based on two earlier reported hits from molecular modeling and virtual screening. The most potent compound was N,N′-bis(2-hydroxybenzylidene)benzene-1,4-diamine, which was equipotent with the most potent hit compound and well-known SIRT2 inhibitor sirtinol.
Discovery of oxazolo[4,5-b]pyridines and related heterocyclic analogs as novel SIRT1 activators
Bioorganic & Medicinal Chemistry Letters, 2009
a b s t r a c t SIRT1 is an NAD + -dependent protein deacetylase that appears to produce beneficial effects on metabolic parameters such as glucose and insulin homeostasis. Activation of SIRT1 by resveratrol (1) has been shown to modulate insulin resistance, increase mitochondrial content and prolong survival in lower organisms and in mice on a high fat diet. Herein, we describe the identification and SAR of a series of oxazolo [4,5-b]pyridines as novel small molecule activators of SIRT1 which are structurally unrelated to and more potent than resveratrol.