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Öğe The anticholinesterase perspective of dimethoxyindole based benzenesulfonamides: Synthesis, biological investigation and molecular docking applications(John Wiley and Sons Inc., 2024) Bingül, Murat; Ercan, Selami; Boǧa, Mehmet; Arslan, Zehra; Tuneğ, Muhammed; Akocak, Süleyman; Bingül, Alev Arslantürk; Şengül, İbrahim Fazıl; Şahin, HasanDue to the well-known biological potential of benzenesulfonamides for the inhibition of specific enzymes, here in, we propose to investigate anticholinesterase efficiencies of five newly synthesized benzenesulfonamides incorporating dimethoxyindole tails. The targeted compounds were synthesized through the C7 position of the methyl 4,6-dimethoxy-1H-indole-2-carboxylate via Schiff-base reaction. The biological study was directed to identify the acetylcholinesterase (ACh) and butyrylcholinesterase (BCh) enzyme inhibitions. The molecular docking studies were also carried out to determine the possible poses of ligands 8 a–e in binding sites of enzymes and ligand-residue interactions. Molecular dynamics simulations, RMSD and RMSF plots, hydrogen bond analysis, per-residue energy decomposition and MM-PB(GB)/SA calculations were carried out investigate the potentials of the compounds towards the designated enzymes. It is important to note that all the synthesized compounds were found to be selective towards the BChE inhibition with a range of efficiencies. In addition to that the compound 8 a exhibited more potency than the standard Galanthamine with the value of 87.75 % for the same enzyme. The results could be valuable for the determination of new targets which are highly selective for BChE inhibition. The formation of hydrogen bonds and hydrophobic interactions with the residues located on the compounds were responsible for the binding free energy scores. The stability of all the compounds proved by molecular dynamics simulations were also promising for the further directions of the study.Öğe Antioxidant, acetylcholinesterase and butyrylcholinesterase inhibition profiles of histamine schiff bases(Turkish Chemical Society, 2019) Akocak, Süleyman; Lolak, Nabih; Tuneğ, Muhammed; Boǧa, MehmetIn this work, a series of histamine Schiff bases H(1-20) were assayed for antioxidant properties by using different bioanalytical methods such as DPPH-free radical scavenging assay, ABTS cation radical decolarization, cupric reducing antioxidant capacity (CUPRAC) and metal chelating methods. The acetylcholinesterase (AChE) and butyrylcholinesterase (BChE) inhibition profiles were also assessed. In general, the synthesized compounds showed weak antioxidant activity against all tested methods, but some of them showed great inhibition potency against AChE and BChE enzymes. Specifically, compound H9 showed effective inhibition potency against both enzymes with percent inhibition of 97.03 and 93.64, respectively.Öğe Design, synthesis and biological evaluation of 1,3-diaryltriazene-substituted sulfonamides as antioxidant, acetylcholinesterase and butyrylcholinesterase inhibitors(Turkish Chemical Society, 2019) Akocak, Süleyman; Boğa, Mehmet; Lolak, Nabih; Tuneğ, Muhammed; Sanku, Rajesh Kishore Kumar1,3-diaryltriazenes are one of the most useful and important linkers for many pharmaceutical applications. Therefore, in the current work, a series of 1,3-diaryltriazene sulfonamides 4(a-k) were synthesized by reacting diazonium salt of sulfanilamide and substituted aromatic amine derivatives 3(a-k). The obtained compounds were investigated for antioxidant properties by using different methods such as a DPPH radical scavenging assay, ABTS radical decolarization, cupric reducing antioxidant capacity (CUPRAC) and metal chelating methods. The cholinesterase inhibition activities (acetylcholinesterase and butyrylcholinesterase) of synthesized compounds were also tested. In general, compounds showed weak antioxidant activity, except compounds 4d (IC50 =114.89 for DPPH activity), 4i (IC50 =25.31 for ABTS activity), 4a (IC50 = 86.33 for metal chelating activity), and 4k (absorbance value 1.229 µM for CUPRAC). Some of the compounds showed great % inhibition against both acetylcholinesterase and butyrylcholinesterase with % inhibition values ranging from 11.54 to 93.67 and 62.24 to 98.47, respectively.Öğe Evaluation of acetyl-and butyrylcholinesterase enzyme inhibitory activities and cytotoxic activities of anthraquinone derivatives(Turkish Chemical Society, 2022) Özkök, Funda; Boğa, Mehmet; Tuneğ, Muhammed; Atalay, Vildan Enisoğlu; Onul, Nihal Yılmaz; Asgarova, KamalaIn this study, the enzyme activity of anthraquinone compounds which were synthesized beforehand by our research group was investigated. Molecular docking studies were performed for compounds 1-(4-aminophenylthio)anthracene-9,10-dione (3) and 1-(4-chlorophenylthio)anthracene9,10-dione (5). Compound 3 was synthesized from the reaction of 1-chloroanthraquinone (1) and 4aminothiophenol (2). Compound 5 was synthesized (1) from the reaction of 1-chloroanthraquinone (1) and 4-chlorothiophenol (4). Anthraquinone analogs (3, 5) were synthesized with a new reaction method made by our research group (2). Inhibitory effects of compounds 3 and 5 were investigated against acetylcholinesterase (AChE) and butyrylcholinesterase (BuChE) enzymes which are related to Alzheimer’s Disease (AD). Compounds 3 and 5 exhibited strong anti-acetyl-and butyryl-cholinesterase inhibition activities than galanthamine used as standard compound (92.11±1.08 and 80.95±1.77 %, respectively). The EHOMO-ELUMO values, molecular descriptors, and the calculated UV-Vis spectra of anthraquinone derivatives were computed by B3LYP/6-31+G(d,p) levels in the CHCl3 phase. Based on the fluorescence property of the anthraquinone skeleton, the fluorescence activity of the bioactive anthraquinone analogue (5) was investigated. MTT test was performed to determine the cytotoxic effects of thioanthraquinone molecules 3 and 5. In MTT analyses, 3 compounds showed the highest effect against Ishikawa cells at a dose of 10 µg/mL, while compound 5 showed the highest effect at a dose of 50 µg/mL. The cell viability for compound 3 was 84.18% for 10 µg/mL and the cell viability for compound 5 was 75.02% for 50 µg/mL.Öğe In Silico studies and DNA cleavage, antioxidant, acetylcholinesterase, and butyrylcholinesterase activity evaluation of bis-histamine schiff bases and bis-spinaceamine substituted derivatives(Springer, 2022) Lolak, Nebih; Boğa, Mehmet; Sönmez, Görkem Deniz; Tuneğ, Muhammed; Doğan, Aslınur; Akocak, SüleymanIn this work, a series of seven bis-histamine Schiff bases (H1-H4) and bis-spinaceamine substituted derivatives (SPH1, SPH2, and SPH4) were successfully re-synthesized to evaluate their antioxidant properties by several bioanalytical methods such as DPPH free radical scavenging assay, ABTS radical cation decolorization assay, metal chelating and CUPRAC methods. On the other hand, these compounds were also investigated as inhibitors of acetylcholinesterase (AChE), butyrylcholinesterase (BChE) and DNAcleavage. The results revealed that all compounds showed, in general, moderate DPPH and ABTS radical scavenging activities, and low metal chelating and CUPRAC activities. Specifically, compound SPH4 showed good DPPH radical scavenging activity with IC50 value of 59.59 mu M, which is better than the BHA and BHT standard values. The best AChE and BChE inhibition results among the tested series were also obtained for compound SPH4 with % inhibition values of 84.51 and 75.89, respectively. Taken together, compound SPH4 might be an interesting lead compound to discover more potent agents against these enzymes.Öğe Sulphonamides incorporating 1,3,5-triazine structural motifs show antioxidant, acetylcholinesterase, butyrylcholinesterase, and tyrosinase inhibitory profile(Taylor and Francis Ltd, 2020) Lolak, Nabih; Boǧa, Mehmet; Tuneğ, Muhammed; Karakoç, Gulçin; Akocak, Suleyman; Supuran, Claudiu T.A series of 16 novel benzenesulfonamides incorporating 1,3,5-triazine moieties substituted with aromatic amines, dimethylamine, morpholine and piperidine were investigated. These compounds were assayed for antioxidant properties by using 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging assay, 2,2`-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid (ABTS) radical decolarisation assay and metal chelating methods. They were also investigated as inhibitors of acetylcholinesterase (AChE), butyrylcholinesterase (BChE) and tyrosinase, which are associated with several diseases such as Alzheimer, Parkinson and pigmentation disorders. These benzenesulfonamides showed moderate DPPH radical scavenging and metal chelating activity, and low ABTS cation radical scavenging activity. Compounds 2 b, 3d and 3 h showed inhibitory potency against AChE with % inhibition values of >90. BChE was also effectively inhibited by most of the synthesised compounds with >90% inhibition potency. Tyrosinase was less inhibited by these compounds.
