scholarly journals Impact of N-Alkylamino Substituents on Serotonin Receptor (5-HTR) Affinity and Phosphodiesterase 10A (PDE10A) Inhibition of Isoindole-1,3-dione Derivatives

Molecules ◽  
2020 ◽  
Vol 25 (17) ◽  
pp. 3868
Author(s):  
Anna Czopek ◽  
Anna Partyka ◽  
Adam Bucki ◽  
Maciej Pawłowski ◽  
Marcin Kołaczkowski ◽  
...  
Keyword(s):  
Molecular Interactions ◽  
Active Site ◽  
Serotonin Receptors ◽  
Serotonin Receptor ◽  
Behavioral Model ◽  
Binding Mode ◽  
Docking Studies ◽  
Computer Aided ◽  
Phosphodiesterase 10A

In this study, a series of compounds derived from 4-methoxy-1H-isoindole-1,3(2H)-dione, potential ligands of phosphodiesterase 10A and serotonin receptors, were investigated as potential antipsychotics. A library of 4-methoxy-1H-isoindole-1,3(2H)-dione derivatives with various amine moieties was synthesized and examined for their phosphodiesterase 10A (PDE10A)-inhibiting properties and their 5-HT1A and 5-HT7 receptor affinities. Based on in vitro studies, the most potent compound, 18 (2-[4-(1H-benzimidazol-2-yl)butyl]-4-methoxy-1H-isoindole-1,3(2H)-dione), was selected and its safety in vitro was evaluated. In order to explain the binding mode of compound 18 in the active site of the PDE10A enzyme and describe the molecular interactions responsible for its inhibition, computer-aided docking studies were performed. The potential antipsychotic properties of compound 18 in a behavioral model of schizophrenia were also investigated.

scholarly journals Computer-Aided Studies for Novel Arylhydantoin 1,3,5-Triazine Derivatives as 5-HT6 Serotonin Receptor Ligands with Antidepressive-Like, Anxiolytic and Antiobesity Action In Vivo

Molecules ◽  
2018 ◽  
Vol 23 (10) ◽  
pp. 2529 ◽  
Author(s):  
Rafał Kurczab ◽  
Wesam Ali ◽  
Dorota Łażewska ◽  
Magdalena Kotańska ◽  
Magdalena Jastrzębska-Więsek ◽  
...  
Keyword(s):  
Serotonin Receptor ◽  
Binding Mode ◽  
Docking Studies ◽  
Biological Evaluation ◽  
Activity Data ◽  
Aromatic Fragment ◽  
Design Synthesis ◽  
Computer Aided

This study focuses on the design, synthesis, biological evaluation, and computer-aided structure-activity relationship (SAR) analysis for a novel group of aromatic triazine-methylpiperazines, with an hydantoin spacer between 1,3,5-traizine and the aromatic fragment. New compounds were synthesized and their affinities for serotonin 5-HT6, 5-HT1A, 5-HT2A, 5-HT7, and dopamine D2 receptors were evaluated. The induced-fit docking (IFD) procedure was performed to explore the 5-HT6 receptor conformation space employing two lead structures. It resulted in a consistent binding mode with the activity data. For the most active compounds found in each modification line, anti-obesity and anti-depressive-like activity in vivo, as well as “druglikeness” in vitro, were examined. Two 2-naphthyl compounds (18 and 26) were identified as the most active 5-HT6R agents within each lead modification line, respectively. The 5-(2-naphthyl)hydantoin derivative 26, the most active one in the series (5-HT6R: Ki = 87 nM), displayed also significant selectivity towards competitive G-protein coupled receptors (6–197-fold). Docking studies indicated that the hydantoin ring is stabilized by hydrogen bonding, but due to its different orientation, the hydrogen bonds form with S5.44 and N6.55 or Q6.58 for 18 and 26, respectively. Compound 26 exerted anxiolytic-like and antidepressant-like activities. Importantly, it demonstrated anti-obesity properties in animals fed palatable feed, and did not show toxic effects in vitro.

scholarly journals Pyrazolobenzothiazine-based carbothioamides as new structural leads for the inhibition of monoamine oxidases: design, synthesis, in vitro bioevaluation and molecular docking studies

MedChemComm ◽  
2017 ◽  
Vol 8 (2) ◽  
pp. 452-464 ◽  
Author(s):  
Syed Mobasher Ali Abid ◽  
Sana Aslam ◽  
Sumera Zaib ◽  
Syeda Mahwish Bakht ◽  
Matloob Ahmad ◽  
...  
Keyword(s):  
Molecular Docking ◽  
Active Site ◽  
Potent Inhibitor ◽  
Binding Mode ◽  
Docking Studies ◽  
Design Synthesis ◽  
Molecular Docking Studies ◽  
Monoamine Oxidases ◽  
Mao B

Binding mode of potent inhibitor (green) & cognate ligand (pink) in the active site of MAO-B.

Synthesis and antimicrobial activity of aryldiazenyl/arylhydrazono pyrazoles

2021 ◽  
Vol 45 (11-12) ◽  
pp. 1093-1099
Author(s):  
Abdulrhman Alsayari ◽  
Yahya I Asiri ◽  
Abdullatif Bin Muhsinah ◽  
Mohd. Zaheen Hassan
Keyword(s):  
Active Site ◽  
Phenyl Ring ◽  
Antimicrobial Agents ◽  
Inhibitory Concentration ◽  
Docking Studies ◽  
Considerable Effect ◽  
Design Synthesis ◽  
Structure Activity ◽  
Antimicrobial Evaluation

We report the design, synthesis, and in vitro antimicrobial evaluation of functionalized pyrazoles containing a hydrazono/diazenyl moiety. Among these newly synthesized derivatives, 4-[2-(4-chlorophenyl)hydrazono]-5-methyl-2-[2-(naphthalen-2-yloxy)acetyl]-2,4-dihydro-3 H-pyrazol-3-one is a promising antimicrobial agent against Staphylococcus aureus (minimum inhibitory concentration 0.19 μg mL−1). Structure–activity relationship studies reveal that the electronic environment on the distal phenyl ring has a considerable effect on the antimicrobial potential of the hybrid analogues. Molecular docking studies into the active site of S. aureus dihydrofolate reductase also prove the usefulness of hybridizing a pyrazole moiety with azo and hydrazo groups in the design of new antimicrobial agents.

scholarly journals The 1,3,5-Triazine Derivatives as Innovative Chemical Family of 5-HT6 Serotonin Receptor Agents with Therapeutic Perspectives for Cognitive Impairment

2019 ◽  
Vol 20 (14) ◽  
pp. 3420 ◽  
Author(s):  
Gniewomir Latacz ◽  
Annamaria Lubelska ◽  
Magdalena Jastrzębska-Więsek ◽  
Anna Partyka ◽  
Małgorzata Anna Marć ◽  
...  
Keyword(s):  
Cognitive Impairment ◽  
Serotonin Receptors ◽  
Serotonin Receptor ◽  
Molecular Mechanisms ◽  
Binding Properties ◽  
Piperazine Derivatives ◽  
Behavioral Studies ◽  
Triazine Derivatives

Among serotonin receptors, the 5-HT6 subtype is the most controversial and the least known in the field of molecular mechanisms. The 5-HT6R ligands can be pivotal for innovative treatment of cognitive impairment, but none has reached pharmacological market, predominantly, due to insufficient “druglikeness” properties. Recently, 1,3,5-triazine-piperazine derivatives were identified as a new chemical family of potent 5-HT6R ligands. For the most active triazine 5-HT6R agents found (1–4), a wider binding profile and comprehensive in vitro evaluation of their drug-like parameters as well as behavioral studies and an influence on body mass in vivo were investigated within this work. Results indicated the most promising pharmacological/druglikeness profiles for 4-((1H-indol-3-yl)methyl)-6-(4-methylpiperazin-1-yl)-1,3,5-triazin-2-amine (3) and 4-((2-isopropyl-5-methylphenoxy)methyl)-6-(4-methylpiperazin-1-yl)-1,3,5-triazin-2-amine (4), which displayed a significant procognitive action and specific anxiolytic-like effects in the behavioral tests in vivo together with satisfied pharmaceutical and safety profiles in vitro. The thymol derivative (4) seems to be of higher importance as a new lead candidate, due to the innovative, non-indole and non-sulfone structure with the best 5-HT6R binding properties.

scholarly journals In Silico Identification and Docking-Based Drug Repurposing Against the Main Protease of SARS-CoV-2, Causative Agent of COVID-19

2020 ◽  
Author(s):  
Yogesh Kumar ◽  
Harvijay Singh
Keyword(s):  
Virtual Screening ◽  
Active Site ◽  
Viral Infections ◽  
Drug Repurposing ◽  
Docking Study ◽  
Docking Studies ◽  
Main Protease ◽  
Novel Coronavirus ◽  
Approved Drugs

<div>The rapidly enlarging COVID-19 pandemic caused by novel SARS-coronavirus 2 is a global</div><div>public health emergency of unprecedented level. Therefore the need of a drug or vaccine that</div><div>counter SARS-CoV-2 is an utmost requirement at this time. Upon infection the ssRNA genome</div><div>of SARS-CoV-2 is translated into large polyprotein which further processed into different</div><div>nonstructural proteins to form viral replication complex by virtue of virus specific proteases:</div><div>main protease (3-CL protease) and papain protease. This indispensable function of main protease</div><div>in virus replication makes this enzyme a promising target for the development of inhibitors and</div><div>potential treatment therapy for novel coronavirus infection. The recently concluded α-ketoamide</div><div>ligand bound X-ray crystal structure of SARS-CoV-2 Mpro (PDB ID: 6Y2F) from Zhang et al.</div><div>has revealed the potential inhibitor binding mechanism and the determinants responsible for</div><div>involved molecular interactions. Here, we have carried out a virtual screening and molecular</div><div>docking study of FDA approved drugs primarily targeted for other viral infections, to investigate</div><div>their binding affinity in Mpro active site. Virtual screening has identified a number of antiviral</div><div>drugs, top ten of which on the basis of their bending energy score are further examined through </div><div>molecular docking with Mpro. Docking studies revealed that drug Lopinavir-Ritonavir, Tipranavir</div><div>and Raltegravir among others binds in the active site of the protease with similar or higher</div><div>affinity than the crystal bound inhibitor α-ketoamide. However, the in-vitro efficacies of the drug</div><div>molecules tested in this study, further needs to be corroborated by carrying out biochemical and</div><div>structural investigation. Moreover, this study advances the potential use of existing drugs to be</div><div>investigated and used to contain the rapidly expanding SARS-CoV-2 infection.</div>

scholarly journals Structural Insights into Novel 15-Prostaglandin Dehydrogenase Inhibitors

Molecules ◽  
2021 ◽  
Vol 26 (19) ◽  
pp. 5903
Author(s):  
Prema L. Mallipeddi ◽  
Yongyou Zhang ◽  
Hongyun Li ◽  
Sanford D. Markowitz ◽  
Bruce Posner
Keyword(s):  
Binding Mode ◽  
Marrow Transplant ◽  
Docking Studies ◽  
Binding Interactions ◽  
Prostaglandin Dehydrogenase ◽  
Dynamics Simulations ◽  
Key Residues ◽  
Structural Insights

We discovered SW033291 in a high throughput chemical screen aimed at identifying 15-prostaglandin dehydrogenase (15-PGDH) modulators. The compound exhibited inhibitory activity in in vitro biochemical and cell-based assays of 15-PGDH activity. We subsequently demonstrated that this compound, and several analogs thereof, are effective in in vivo mouse models of bone marrow transplant, colitis, and liver regeneration, where increased levels of PGE2 positively potentiate tissue regeneration. To better understand the binding of SW033291, we carried out docking studies for both the substrate, PGE2, and an inhibitor, SW033291, to 15-PGDH. Our models suggest similarities in the ways that PGE2 and SW033291 interact with key residues in the 15-PGDH-NAD+ complex. We carried out molecular dynamics simulations (MD) of SW033291 bound to this complex, in order to understand the dynamics of the binding interactions for this compound. The butyl side chain (including the sulfoxide) of SW033291 participates in crucial binding interactions that are similar to those observed for the C15-OH and the C16-C20 alkyl chain of PGE2. In addition, interactions with residues Ser138, Tyr151, and Gln148 play key roles in orienting and stabilizing SW033291 in the binding site and lead to enantioselectivity for the R-enantiomer. Finally, we compare the binding mode of (R)-S(O)-SW033291 with the binding interactions of published 15-PGDH inhibitors.

scholarly journals Crambescin C1 Acts as A Possible Substrate of iNOS and eNOS Increasing Nitric Oxide Production and Inducing In Vivo Hypotensive Effect

2021 ◽  
Vol 12 ◽  
Author(s):  
Juan A. Rubiolo ◽  
Emilio Lence ◽  
Concepción González-Bello ◽  
María Roel ◽  
José Gil-Longo ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Active Site ◽  
In Silico ◽  
Hypotensive Effect ◽  
Docking Studies ◽  
No Production ◽  
Guanidine Alkaloids ◽  
Endogenous Substrate

Crambescins are guanidine alkaloids from the sponge Crambe crambe. Crambescin C1 (CC) induces metallothionein genes and nitric oxide (NO) is one of the triggers. We studied and compared the in vitro, in vivo, and in silico effects of some crambescine A and C analogs. HepG2 gene expression was analyzed using microarrays. Vasodilation was studied in rat aortic rings. In vivo hypotensive effect was directly measured in anesthetized rats. The targets of crambescines were studied in silico. CC and homo-crambescine C1 (HCC), but not crambescine A1 (CA), induced metallothioneins transcripts. CC increased NO production in HepG2 cells. In isolated rat aortic rings, CC and HCC induced an endothelium-dependent relaxation related to eNOS activation and an endothelium-independent relaxation related to iNOS activation, hence both compounds increase NO and reduce vascular tone. In silico analysis also points to eNOS and iNOS as targets of Crambescin C1 and source of NO increment. CC effect is mediated through crambescin binding to the active site of eNOS and iNOS. CC docking studies in iNOS and eNOS active site revealed hydrogen bonding of the hydroxylated chain with residues Glu377 and Glu361, involved in the substrate recognition, and explains its higher binding affinity than CA. The later interaction and the extra polar contacts with its pyrimidine moiety, absent in the endogenous substrate, explain its role as exogenous substrate of NOSs and NO production. Our results suggest that CC serve as a basis to develop new useful drugs when bioavailability of NO is perturbed.

scholarly journals Chalcones as a basis for computer-aided drug design: innovative approaches to tackle malaria

2019 ◽  
Vol 11 (20) ◽  
pp. 2635-2646 ◽  
Author(s):  
Marilia NN Lima ◽  
Bruno J Neves ◽  
Gustavo C Cassiano ◽  
Marcelo N Gomes ◽  
Kaira CP Tomaz ◽  
...  
Keyword(s):  
Drug Design ◽  
Plasmodium Berghei ◽  
Experimental Validation ◽  
Docking Studies ◽  
Antiplasmodial Activity ◽  
Computer Aided Drug Design ◽  
Protein Targets ◽  
Computer Aided ◽  
Falciparum Protein

Aim: Computer-aided drug design approaches were applied to identify chalcones with antiplasmodial activity. Methodology: The virtual screening was performed as follows: structural standardization of in-house database of chalcones; identification of potential Plasmodium falciparum protein targets for the chalcones; homology modeling of the predicted P. falciparum targets; molecular docking studies; and in vitro experimental validation. Results: Using these models, we prioritized 16 chalcones with potential antiplasmodial activity, for further experimental evaluation. Among them, LabMol-86 and LabMol-87 showed potent in vitro antiplasmodial activity against P. falciparum, while LabMol-63 and LabMol-73 were potent inhibitors of Plasmodium berghei progression into mosquito stages. Conclusion: Our results encourage the exploration of chalcones in hit-to-lead optimization studies for tackling malaria.

Synthesis and 4D-QSAR Studies of Alanine Hydroxamic Acid Derivatives as Aminopeptidase N Inhibitors

2019 ◽  
Vol 16 ◽  
Author(s):  
Min Gao ◽  
Qiao Li Lv ◽  
Hou Pan Zhang ◽  
Guo Gang Tu
Keyword(s):  
Biological Activity ◽  
Active Site ◽  
Hydroxamic Acid ◽  
Binding Mode ◽  
Qsar Model ◽  
Aminopeptidase N ◽  
Design Synthesis ◽  
Qsar Studies ◽  
Hydroxamic Acid Derivatives

Background: As a target for anticancer treatment, aminopeptidase N (APN) shows its overexpression on diverse malignant tumor cells and associates with cancer invasion, angiogenesis and metastasis. Objective: Design, synthesis and biological activity evaluation of alanine hydroxamic acid derivatives as APN inhibitors, and investigation the binding mode of inhibitors in the APN active site. Methods: Alanine hydroxamic acid derivatives were synthesized and evaluated for their in vitro anti-cancer activity using CCK-8 assay. Molecular docking and 4D-QSAR studies were carried out to suggest the mechanism of biological activity. Results: Compared with Bestatin, compound 9b showed the best APN inhibition activity. The putative binding mode of 9b in the APN active site was also discussed. Moreover, the robust and reliable 4D-QSAR model exhibited the following statistics: R2 = 0.9352, q2LOO = 0.8484, q2LNO =0.7920, R2Pred = 0.8739. Conclusion: Newly synthesized compounds exerted acceptable anticancer activity and further investigation on current scaffold would be beneficial.

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