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RSC Advances View Article Online PAPER View Journal | View Issue Exploration of stilbenoid trimers as potential inhibitors of sirtuin1 enzyme using a molecular Cite this: RSC Adv.,2021,11,19323 docking and molecular dynamics simulation approach† Muhammad Ikhlas Abdjan,a Nanik Siti Aminah, *ab Imam Siswanto,a Alfinda Novi Kristanti,ab Yoshiaki Takayace and Muhammad Iqbal Choudhary de A combination of molecular docking and molecular dynamics simulation (250 ns) has been carried out to study the interaction of stilbenoid trimer compounds with the SIRT1 enzyme as the target protein. SIRT1 expression regulates cellular stress responses that lead to the development of cancer. Redocking showed a good native ligand pose with an RMSD value of 1.40 A˚ at the receptor active site's coordinates. The molecular docking score uses a grid score functional (kcal molÀ1), which shows results of 1NS: 79.56, TS1: À26.83, TS2: À87.77, and TS3: À83.67. The TS2 and TS3 candidates were chosen for further Creative Commons Attribution-NonCommercial 3.0 Unported Licence. analysis because they had a lower grid score than the native ligand (1NS). Furthermore, prediction of binding free energy (kcal molÀ1) using the Quantum Mechanics/generalized Born Surface Area (QM/MM- GBSA) method shows the results of 1NS: À31.52 Æ 0.39, TS2: À58.99 Æ 0.34, and TS3: À43.38 Æ 0.35. These results indicate that the TS2 and TS3 compounds have good potential as inhibitors of the SIRT1 Received 20th March 2021 enzyme. Additionally, the amino acid residues were responsible for the inhibition mechanism through Accepted 21st May 2021 hydrogen bond interactions at the molecular level, including ASP22, PHE91, PRO11, ILE165, ASP166, and DOI: 10.1039/d1ra02233d VAL230. The observations made in this study provide theoretical information for exploring the stilbenoid rsc.li/rsc-advances trimers as anticancer agents by targeting the SIRT1 enzyme. This article is licensed under a Introduction deacetylate other proteins to facilitate cell growth through cell cycle pathways, such as FOXO3a, RB1, KU70, and E2F1.10 Open Access Article. Published on 27 May 2021. Downloaded 6/8/2021 2:45:02 AM. The enzyme sirtuin1 is present in the nucleus, and belongs to Besides, the activity of the SIRT1 enzyme can mediate cancer class III histone deacetylases (HDACs) which regulate multiple growth through the apoptotic pathway by inhibiting p53 biological processes.1,2 The enzyme sirtuin1 (SIRT1) is one of the activity.11 Therefore, studies regarding the inhibition of the isoforms of the sirtuin enzyme family (SIRT1–SIRT7), which has SIRT1 enzyme are promising as an inhibitory target in sup- become the center of attention due to its implications for pressing cancer growth. cancer.3–5 It is known that the overexpression of the SIRT1 Studies on the inhibition of the SIRT1 enzyme had reported – enzyme affects cancer development, such as breast cancer,6,7 by several previous studies using in vitro approach.12 16 One of colon cancer,7 and prostate cancer.7,8 The nicotinamide adenine them was 4-(4-(2-[(methylsulfonyl)amino]ethyl)piperidin-1-yl) dinucleotide (NAD) deacetylase dependent plays an important thieno [3,2-d]pyrimidine-6-carboxamide had known can 9 16 role in regulating cellular stress responses. SIRT1 enzyme can inhibit the SIRT1 enzyme with IC50 value 4 nM. Additionally, stilbenoid derivatives showed SIRT1 (IC50 mM) enzyme inhibi- tory activity, such as stilbenoid dimer ((À)-ampelopsin F: 24.4 aDepartement of Chemistry, Faculty of Science and Technology, Universitas Airlangga, mM) and stilbenoid tetramer ((+)-vitisin A: 22.0 mM, (À)-vitisin B: Surabaya 60115, Indonesia. E-mail: [email protected] 21.1 mM, (+)-hopeaphenol: 3.45 mM, (À)-hopeaphenol: 18.1 mM, bBiotechnology of Tropical Medicinal Plants Research Group, Universitas Airlangga, and (À)-isohopeaphenol: 21.6 mM).17 Indonesia Stilbenoid derivatives obtained from natural products are cFaculty of Pharmacy, Meijo University, 150 Yagotoyama, Tempaku, Nagoya, 468- one of the solutions to get potential inhibitors against cancer.18 8503, Japan dH. E. J. Research Institute of Chemistry, International Center for Chemical and Stilbenoid derivatives are a class of polyphenol compounds 17,19 Biological Sciences, University of Karachi, Karachi-75270, Pakistan have known to inhibit the SIRT1 enzyme. Stilbenoid deriv- eAdjunct Professor Department of Chemistry, Faculty of Science and Technology, atives such as stilbenoid trimers isolated in the Dry- Universitas Airlangga, Komplek Kampus C UNAIR, Jl. Mulyorejo, Surabaya, Indonesia obalanops20,21 and Vitis labrusca22 plants, widely distributed in † Electronic supplementary information (ESI) available. See DOI: Indonesia and Malaysia. Structurally, the stilbenoid trimers 10.1039/d1ra02233d © 2021 The Author(s). Published by the Royal Society of Chemistry RSC Adv.,2021,11,19323–19332 | 19323 View Article Online RSC Advances Paper consist of three resveratrol monomers, which are linked by labrusca (Fig. 1). The stilbenoid trimer compounds that were cyclic 2,3-dihydrofuran. Besides, the stilbenoid trimers have successfully isolated and characterized are (À)-a-viniferin (TS1),22 three hydroxy (–OH) groups in each monomer.23 The presence of cis-diptoindonesin B (TS2),29 and trans-diptoindonesin B (TS3).29 this hydroxy group is expected to have a promising interaction The TS2 and TS3 compounds are new compounds that were with the amino acid residues at the active site of the SIRT1 successfully reported by previous research.29 enzyme in the form of a hydrogen bond donor (HBD). Geometry optimization of the stilbenoid trimers as a ligand The combination and integration of molecular docking and using the Semiempirical Quantum Method-Austin Model 1 molecular dynamic (MD) simulation is the main focus to study (SQM-AM1) to calculate the electrostatic potential (ESP) charges the potential of stilbenoid trimers as inhibitors of the SIRT1 using the Gaussian 16 package.30 The coordinates of the native enzyme. The structure-based approach has the advantage of ligand (PDB code: 1NS) and standard residue (receptor) were exploring the inhibitory mechanism through the interaction extracted from the crystal structure of SIRT1 (PDB code: 4ZZI) between ligand and receptor at the molecular level.24 Evaluation using Chimera version 1.13 package. Besides, missing residues of the interaction energy between ligand and receptor through and loop segments rebuilt using Modeller 9.21 package. The a combination of molecular docking and MD simulation are the AMBER FF14SB force eld and Austin Model 1-Bond Charge main parameters that are focused on this research. The grid Correction (AM1-BCC) had used to calculate ligand and receptor score functional has been reported to have the advantage of parameters such as bonded, non bonded, and charge. efficient calculation in nding the coordinates of the receptor active site.25 Meanwhile, further evaluation about binding Molecular docking affinity through the calculation of binding free energy using the Quantum Mechanics/Molecular Mechanics-generalized Born Molecular docking uses the performance of the Dock6 package. ˚ Surface Area (QM/MM-GBSA) method. The binding free energy The cluster sphere selection used a radius of 10.0 A from the calculation based on QM/MM requires a high cost and a long coordinates of the native ligand. The grid-box determination conducted using grid spacing 0.5 A˚ with a box size based on the Creative Commons Attribution-NonCommercial 3.0 Unported Licence. calculation time. However, calculation results can improve the prediction accuracy compared to conventional calculation selected cluster sphere. The minimization process at the (MM).26,27 It is expected that a structure-based approach by molecular docking stage needs to minimize the energy when considering the important parameters presented in this study the ligand docking process to the receptors. The type of – will help in understanding the inhibition mechanism of the conformation used in observing ligand receptor interactions is stilbenoid trimers against the SIRT1 enzyme. exible conformation with energy calculations using a grid score functional. The validation process aims to nd out the best pose using the RMSD criterion # 2.0 A.˚ 31 This step aims to Methodology obtain the best possible native ligand coordinates as a reference ˚ This article is licensed under a with RMSD close to 0 A. Furthermore, footprint analysis had Ligand and receptor preparation done to see the residues responsible for the ligand–receptor The target protein used the NAD-dependent protein deacetylase interactions on the active site by comparing van der Waals sirtuin-1 (SIRT1) enzyme obtained from the Protein Data Bank energy (E ) and electrostatic energy (E ). This comparison Open Access Article. Published on 27 May 2021. Downloaded 6/8/2021 2:45:02 AM. vdW ele (PDB code: 4ZZ1). The crystal structure of SIRT1 (PDB code: 4ZZ1) aims to see the difference between the EvdW and Eele of native has native ligands, namely 4-(4-(2-[(methylsulfonyl)amino]ethyl) ligand between the crystal structure (reference) and the piperidin-1-yl)thieno[3,2-d]pyrimidine-6-carboxamide (PDB code: redocking result (pose). 1NS) at the active site's.28 The native ligand (1NS) was a reference in this study. Because it has known the 1NS ligand can inhibit the SIRT1 enzyme from previous research.16 Meanwhile, the ligand Molecular dynamics simulation candidates used in this study were stilbenoid trimer compounds Integration of the score function aims to obtain ligand coordi- obtained from the tree bark of Dryobalanops oblongifolia and Vitis nates from the docking results using the General AMBER Force Fig. 1 Chemical structure of stilbenoid trimers isolated from the tree bark of Dryobalanops oblongifolia and Vitis labrusca, where the atomic label and ring region are marked. 19324 | RSC Adv.,2021,11,19323–19332 © 2021 The Author(s). Published by the Royal Society of Chemistry View Article Online Paper RSC Advances Field (GAFF). Several AMBER18 tools such as antechamber and ns to produce trajectories for further analysis purposes.