Pharmacogn Res. 2021; 14(1):12-18

A Multifaceted Journal in the field of Natural Products and Pharmacognosy www.phcogres.com | www.phcog.net

Original Article

Virtual Screening of Fargesin Analogs as Candidates as Inhibitors of Aedes aegypti Sterol Carrier Protein

Sammya Yasmin EM De Lima1, Anderson Roberto Nery Da Silva1, Cíntia Emi Yanaguibashi Leal2, Edilson B De Alencar Filho1,2,3,*

Sammya Yasmin EM De Lima1, Anderson Roberto Nery Da Silva1, Cíntia Emi Yanaguibashi Leal2, Edilson B De Alencar Filho1,2,3,*

1Department of Pharmaceutical Sciences, Federal University of Vale do São Franciso Campus Petrolina-Centro, BRAZIL.

2Post Graduation Program in Biosciences, University of Vale do São Franciso Campus Petrolina-Centro, BRAZIL.

3Post Graduation Program in Health and Biological Sciences, University of Vale do São Franciso Campus Petrolina-Centro, BRAZIL.

Correspondence

Prof. Edilson B de Alencar Filho

1Department of Pharmaceutical Sciences, Federal University of Vale do São Franciso Campus Petrolina-Centro, BRAZIL.

2Post Graduation Program in Biosciences, University of Vale do São Franciso Campus Petrolina-Centro, BRAZIL.

3Post Graduation Program in Health and Biological Sciences, University of Vale do São Franciso Campus Petrolina-Centro, BRAZIL.

Email id: edilson.beserra@univasf.edu.br

History

Submission Date: 08-10-2021;

Review completed: 26-10-2021;

Accepted Date: 21-12-2021

DOI : 10.5530/pres.14.1.3

Article Available online

http://www.phcogres.com

Copyright

© 2022 Phcog.Net. This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International license.

ABSTRACT

Background: Fargesin is a natural product that was identified by our group in previous work as a potent ligand of the sterol-binding protein-2 (SCP-2) of Aedes aegypti, the mosquito that which causes the propagation of diseases such as zika, dengue, Chikungunya, and yellow fever. Objectives: propose structural analogs synthetically accessible to be evaluated by molecular docking, preserving the fargesin privileged group’s benzodioxol and methoxybenzene, with different spacer groups. Materials and Methods: Structures were obtained in PubChem® and SciFinder® databases, in .sdf format. Chemical structures were converted to pdbqt format by the OpenBabel GUI® program. Macromolecular target SCP-2 (PDB ID: 1PZ4) was extracted from the RSCB-PDB® platform, and molecular docking was performed using the Autodock vina program. The target binding site was defined based on the crystallographic ligand (palmitic acid), with grid box dimensions 16x12x18 Å. Results: The database built had 1231 molecules, with molecules that had binding energy lower than -6.9 Kcal/mol considered valid results. Thus, of the 447 molecules that were most favorable, the best results were for the compounds: 188 (-12.6 Kcal/mol), 350 (-12.6 Kcal/mol), 351 (-12.3 Kcal/mol), 773 (-12.3 Kcal/mol) and 831 (-12.1 Kcal/mol). Conclusion: The results of this paper showed that isoflavonoids synthetically acessible are promising candidates for larvicidal agents, which corroborates with other published data from our research group and encourages experimental investigations.

Key words: Aedes aegypti, Fargesin, Isoflavonoids, Molecular docking, Synthetic Analogs.

Cite this article: Lima SYEMD, Silva ARND, Leal CEY, Filho EBDA. Virtual Screening of Fargesin Analogs as Candidates as Inhibitors of Aedes aegypti Sterol Carrier Protein. Pharmacog Res. 2022;14(1):12-8.

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INTRODUCTION

Every year more than one million people die from vector-borne diseases, of which mosquito-borne diseases represent a significant proportion.[1] One of the most important vectors that transmit diseases is the Aedes aegypti mosquito, which causes the propagation of diseases such as zika, dengue, Chikungunya, and yellow fever.[2] Given that a single mosquito is the primary vector of multiple human diseases, the development of new strategies for mosquito control is crucial.[3] The most common way to combat the mosquito is with insecticides. However, they are toxic to humans and the environment.[4] Another concern about chemical agents is the increasing resistance of the mosquito vector.[5] In this context, natural products, especially secondary metabolites, have emerged as agents that are generally safer for humans and that generate fewer residues in the environment.[6]

In a previous work of our laboratory, we investigated the affinity of 248 secondary metabolites of plants from the Caatinga Biome as potential ligands of Steroid Carrier Protein-2 (SCP-2) from Aedes aegypti. Among the highlighted compounds, we identified Fargesin,[7] a compound with multiple pharmacological activities, including attenuation of oxidative stress and anti-inflammatory activity in monocytic cells,[8] increase in basal glucose uptake by translocating Insulin-Sensitive Glucose Transporter (GLUT4),[9] antihypertensive activity,[10] inhibition of melanin synthesis,[11] and antitrypanosomal activity. pere

Fargesin belongs to the class of lignans (also known as neolignans). Lignans are found in plants of Aristolochia genus popularly known as “mil-homens” or “jarrinha”; and in plants of Magnolia genus commonly known as “pinha – do – brejo” or “baguaçu”.[12-14] This metabolite is derived from the oxidative coupling of two phenylpropanoid units and propenylphenols (isoeugenol and coniferyl alcohol), with regiospecific and diastereospecific control.[15] Different monomeric precursors generate new subgroups of lignans by cyclization or modifications in the carbon skeleton, resulting in a wide variety of substances.[13] Within these subclasses, Fargesin is classified as furanic lignan, characterized by a benzodioxol ring, bonded to a linker structure of furanoid rings bonded to dimethoxybenzene,[11] (Figure 1).

Figure 1: Fargesin.

Given the already known biological characteristics of Fargesin, as well as its potential previously identified by our group, this study aimed to perform a virtual screening study using Molecular Docking (MD), applied to a set of 1231 molecules designed for the synthesis of Fargesin analogs. In these molecular architectures, two privileged structures of the original lignan were preserved, the benzodioxol and dimethoxybenzene systems, replacing only the intermediate furan ring system by linker structures, such as those from the Morita Baylis-Hillman reaction, hydrazones, as well as their retroisosteres. Subsequently, the molecules were tested via docking against the same Aedes aegypti sterol-2-binding protein aiming to identify more promising compounds for future synthesis and bench testing.

MATERIALS AND METHODS

Design and Selection of Analogs

Fargesin analogs with designed linkers were searched using PubChem® and SciFinder® databanks. The structures were found using a search tool, where it was possible to draw the molecule. The proposed compounds were designed to keep the privileged structures of Fargesin, with spacer structures such as Morita Baylis-Hillman (ester, nitrile), hydrazones, and retroisosteres.

The selection criteria were molecules that showed similarity to the proposed molecule. A total of 1231 compounds were selected for Molecular Docking (MD). Then, the 3D molecules were downloaded in SDF file extension and further converted by Open Babel GUI® program,[16] to the mol file extension for edition in ChemSketch® program (ACD/ChemSketch, version 2012, Advanced Chemistry Development, Inc., Toronto, ON, Canada, www.acdlabs.com, 2021); and finally, converted directly by Open Babel GUI® software,[16] to pdbqt file.

Macromolecular target (1PZ4)

The macromolecular target for the evaluation of the larvicidal potential was the Aedes aegypti sterol-binding protein, which crystallographic structure can be found in the Protein Data Bank database, registered under PDB code: 1PZ4. This protein was obtained complexed with its native ligand, a fatty acid known as palmitic acid. After that, the protein was modeled and prepared in Autodock software to add Gastaiger charges and polar hydrogens, which are absent in crystallographic structures, and saved in a pdbqt file for MD.

Molecular docking

Before MD, redocking (RDK) was conducted with the co–crystallo-graphic ligand to determine the accuracy of the docking procedure. All calculations were performed with the Autodock® Vina module.[17] The grid box dimensions chosen were 16x12x18Ǻ, centered on the ligand and with the standard spacing of 1Ǻ between the internal grid points. The same parameters previously described were applied to the docking of the 1231 synthetic analogs of Fargesin. The 3D images and diagrams were generated with the free module of the Schrödinger Maestro software (Maestro, Schrödinger, LLC, New York, NY, 2021).

RESULTS AND DISCUSSION

After searches in PubChem® and SciFinder®, 1231 Fargesin analogs were extracted and tested on the Aedes aegypti sterol-binding protein. Table 1 shows the compounds that had energy lower than -6.9 Kcal/mol, totaling 447 favorable compounds. Table 1 also shows the redocking (RDK) result. It was found that molecules 188, 350, 351, 773, and 831 had an excellent interaction with the protein, achieving binding energy almost twice as stable as RDK and with very slight energy variation between each other. In other words, binding energies had close values. This study aims to discuss the best five molecules.

Table 1: Binding energy of compounds for larvicidal activity in ascending order.

Compounds Binding Energy Compounds Binding Energy Compounds Binding Energy Compounds Binding Energy
188 −12.6 1209 −10 1113 −9.5 25 -9.1
350 −12.6 108 −10 55 −9.4 379 -9.1
351 −12.3 862 −10 100 −9.4 21 -9
773 −12.3 932 −10 576 −9.4 66 -9
831 −12.1 74 −10 836 −9.4 858 -9
1074 −11.9 579 −10 1095 −9.4 1089 -9
346 −11.9 586 −10 1103 −9.4 1102 -9
349 −11.6 1225 −10 102 −9.4 464 -9
347 −11.6 200 −10 105 −9.4 1138 -9
494 −11.5 631 −10 225 −9.4 1159 -9
343 −11.5 308 −9.9 1116 −9.4 71 -9
495 −11.5 1112 −9.9 1171 −9.4 465 -9
348 −11.4 209 −9.9 337 −9.4 502 -9
492 −11.4 973 −9.9 972 −9.4 868 -9
493 −11.4 967 −9.9 135 −9.4 848 -9
826 −11.4 298 −9.8 210 −9.4 1087 -8.9
827 −11.2 1134 −9.8 333 −9.4 259 -8.9
876 −11.2 104 −9.8 977 −9.4 267 -8.9
341 −11.1 1158 −9.8 1155 −9.3 854 -8.9
884 −11.1 578 −9.8 1184 −9.3 1090 -8.9
345 −11 761 −9.8 487 −9.3 340 -8.9
218 −10.9 901 −9.8 1083 −9.3 256 -8.9
1114 −10.8 1172 −9.8 1108 −9.3 352 -8.9
1210 −10.7 70 −9.8 1161 −9.3 463 -8.9
344 −10.7 299 −9.8 136 −9.3 54 -8.9
49 −10.7 602 −9.7 270 −9.3 941 -8.9
69 −10.6 1198 −9.7 863 −9.3 58 -8.8
226 −10.6 4 −9.7 364 −9.3 197 -8.8
886 −10.6 331 −9.7 875 −9.3 593 -8.8
60 −10.6 353 −9.7 1104 −9.3 22 -8.8
292 −10.5 101 −9.7 1186 −9.3 186 -8.8
885 −10.5 1107 −9.7 568 −9.3 1091 -8.8
839 −10.5 1132 −9.7 570 −9.3 1196 -8.8
913 −10.5 466 −9.7 823 −9.3 470 -8.8
971 −10.5 542 −9.7 1109 −9.2 1094 -8.8
758 −10.5 604 −9.7 1174 −9.2 1111 -8.8
802 −10.5 207 −9.6 296 −9.2 1131 -8.8
1224 −10.5 1115 −9.6 594 −9.2 205 -8.8
1092 −10.4 65 −9.6 824 −9.2 61 -8.8
1147 −10.4 222 −9.6 187 −9.2 380 -8.8
805 −10.4 307 −9.6 467 −9.2 1099 -8.8
227 −10.4 1117 −9.6 1148 −9.2 835 -8.8
220 −10.3 1178 −9.6 1223 −9.2 1170 -8.7
910 −10.3 1017 −9.6 960 −9.2 193 -8.7
837 −10.3 680 −9.6 80 −9.1 272 -8.7
216 −10.2 297 −9.6 120 −9.1 497 -8.7
342 −10.2 249 −9.6 756 −9.1 591 -8.7
630 −10.2 489 −9.6 909 −9.1 1088 -8.7
911 −10.2 23 −9.5 1097 −9.1 1133 -8.7
905 −10.2 223 −9.5 1110 −9.1 1140 -8.7
801 −10.1 262 −9.5 1143 −9.1 1151 -8.7
48 −10.1 853 −9.5 861 −9.1 119 -8.7
613 −10.1 933 −9.5 969 −9.1 334 -8.7
1197 −10.1 1192 −9.5 945 −9.1 469 -8.7
587 −10.1 263 −9.5 45 −9.1 1093 -8.7
621 −10.1 850 −9.5 596 −9.1 1229 -8.7
759 −10.1 68 −9.5 757 −9.1 675 -8.7
198 −10 566 −9.5 951 −9.1 772 -8.7
946 −10 683 −9.5 24 −9.1 255 -8.7
301 −8.7 503 −8.2 1105 −7.8 1010 -7.4
940 −8.7 1176 −8.2 673 −7.8 797 -7.4
770 −8.7 931 −8.2 845 −7.8 1185 -7.4
460 −8.6 950 −8.2 1080 −7.8 27 -7.3
605 −8.6 1213 −8.2 1218 −7.8 63 -7.3
1018 −8.6 851 −8.2 72 −7.8 1165 -7.3
1100 −8.6 295 −8.2 461 −7.8 874 -7.3
1157 −8.6 871 −8.2 974 −7.8 483 -7.3
1211 −8.6 1205 −8.2 33 −7.8 26 -7.3
219 −8.6 62 −8.2 484 −7.8 90 -7.3
475 −8.6 224 −8.2 903 −7.8 804 -7.3
926 −8.6 112 −8.1 269 −7.7 206 -7.2
253 −8.6 251 −8.1 1230 −7.7 355 -7.2
288 −8.6 284 −8.1 592 −7.7 1141 -7.2
332 −8.6 760 −8.1 796 −7.7 1189 -7.2
366 −8.6 829 −8.1 1154 −7.7 73 -7.2
462 −8.6 968 −8.1 28 −7.7 324 -7.2
509 −8.6 975 −8.1 211 −7.7 603 -7.2
679 −8.6 1187 −8.1 300 −7.7 91 -7.2
995 −8.6 1188 −8.1 869 −7.7 252 -7.2
1177 −8.6 1220 −8.1 359 −7.7 258 -7.1
89 −8.6 319 −8.1 970 −7.7 552 -7.1
476 −8.5 922 −8.1 928 −7.6 734 -7.1
477 −8.5 1217 −8.1 31 −7.6 1208 -7.1
486 −8.5 38 −8.1 283 −7.6 32 -7.1
852 −8.5 1164 −8.1 287 −7.6 1144 -7
1145 −8.5 870 −8.1 488 −7.6 325 -7
1181 −8.5 185 −8 677 −7.6 1160 -7
257 −8.5 678 −8 887 −7.6 474 -7
481 −8.5 116 −8 260 −7.6 1135 -7
367 −8.5 681 −8 261 −7.6 271 -7
457 −8.5 763 −8 930 −7.6 762 -7
828 −8.5 766 −8 1012 −7.6 285 -7
840 −8.5 956 −8 378 −7.6 739 -7
976 −8.5 291 −8 1146 −7.6 RDK -6.9
111 −8.4 774 −8 40 −7.6    
328 −8.4 1204 −8 67 −7.6    
29 −8.4 290 −8 268 −7.6    
468 −8.4 597 −8 771 −7.6    
819 −8.4 855 −8 866 −7.6    
920 −8.4 316 −7.9 1190 −7.6    
264 −8.4 814 −7.9 1126 −7.5    
265 −8.4 856 −7.9 228 −7.5    
480 −8.4 999 −7.9 479 −7.5    
201 −8.4 1096 −7.9 872 −7.5    
310 −8.4 929 −7.9 959 −7.5    
441 −8.4 1153 −7.9 1162 −7.5    
849 −8.3 86 −7.9 952 −7.5    
1098 −8.3 590 −7.9 1231 −7.5    
322 −8.3 64 −7.9 36 −7.5    
1180 −8.3 302 −7.9 966 −7.5    
674 −8.3 599 −7.9 670 −7.5    
82 −8.3 859 −7.9 245 −7.4    
458 −8.3 1169 −7.9 182 −7.4    
944 −8.3 1221 −7.9 273 −7.4    
459 −8.3 908 −7.9 309 −7.4    
1101 −8.2 834 −7.8 701 −7.4    
846 −8.2 294 −7.8 765 −7.4    
1106 −8.2 755 −7.8 842 −7.4    

Binding energies are represented in kcal/mol. RDK: reocking.

Of the compounds that stabilized the protein, with energies from -12 kcal/mol, three are synthetic isoflavonoids, like molecules 188, named (2-methyl-4-oxo-3-phenylchromen-7-yl)-1,3-benzodioxol-5-carboxylate; 350, named 3-(4-methoxyphenoxyl)-2-methyl-4-oxochromen-7-yl] 1,3-benzodioxol-5-carboxylate; and 351, named [3-(4-methoxyphenyl)-4-oxochromen-7-yl] 1,3-benzodioxol-5-carboxylate. All molecules are analogous to each other. The structures of these compounds are formed by a benzodioxol ring linked by the ester function to the chromone ring, linked to the methoxybenzene ring. For molecule 188, only the benzene ring has no substituent (Figure 2).

Figure 2: Compounds 188 (A), 350 (B) and 351 (C) in 2D and complexed with 1PZ4.

The isoflavonoids contain a methoxyl group at the “para” position of the ring B. Compounds 188, 350, and 351 are derived from 7-hydroxy-4-methoxyflavone, a naturally occurring isoflavonoid known as Formononetin, found in legumes.[18] The molecules are obtained through the alcoholysis reaction, where Formononetin participates as a reagent and thereby forms analogous and biosynthetic molecules. Formononentin derivatives are widely studied because they can reverse multidrug resistance by inhibiting the efflux pump. Furthermore, also have antihypertensive, anti-parasitic,[18] breast and prostate cancer, and antioxidant activity.[19]

Figure 3 shows molecules 188, 350, 351 and their interactions. Note that in all three molecules, the carboxylate group, which binds the benzodioxol group to the chromone ring, interacts with the same amino acids as the native ligand in the main chain, which are Valine 26 (Val 26), Glycine 25 (Gln 25), and Arginine 24 (Arg 24). These interactions occur through hydrogen bonds, represented by the pink arrow in the 2D diagram. Besides the hydrogen bond with these amino acid residues, there is another hydrogen bond between Arg 15 and the oxygen of benzodioxol.

Figure 3: Molecules 188 (A), 350 (B) e 351 (C) interacting with amino acid residues in the protein. In green pi-cation-type bond, in yellow hydrogen bond, in cyan aromatic.

Molecule 773, named 3-[(E)-3-(1,3-benzodioxol-5-yl)prop-2-enoyl]-7-[(3-methoxyphenyl)methoxy]chromen-2-one belongs to the class of polyoxygenated cinnamoylcoumarins. This class is derived from curcumin, which is obtained through the synthetic route with hydroxysalicylaldehyde as a reagent.[20] Like other molecules discussed, cinnamoylcoumarins have biological importance. Resembling curcumin, they possess antioxidant properties, as well as cytotoxic and anticancer effects.[20]

Structurally, molecule 773 has a methoxyl at the “ortho” position of ring A. It can also be observed that between the benzodioxol ring and the chromene ring, it has an E-type (trans) stereoisomer and a carbonyl; and a methoxybenzene bonded to the chromene ring via ethyl ether (Figure 4).

Figure 4: Molecule 773 in 2D (left) and complexed to 1PZ4 (right).

Figure 5: Molecule 773 (left) interacts with the amino acid Asp 20 through aromatic hydrogen bond (cyan), as well as interacting with Arg 15 by hydrogen bond (in yellow) and pi-cation-type bond (green dots). Diagram of interactions is represented on the right. The red arrows represent pi - cation interactions.

Unlike the other molecules, compound 773 had the methoxybenzene group toward the external opening of the hydrophobic pocket, while in the other molecules the benzodioxol group was directed toward the internal region (Figure 4). As a consequence, this compound did not interact with the main chain amino acids Val 26, Gln 25, and Arg 24, only with the side chain residue Arg 15 via hydrogen bonding with the methyl ether of methoxybenzene, represented by the pink arrow in Figure 4 on the right and yellow dotted on the left. Other interactions were also observed, such as pi-cation type interaction and charge type bonding with Arg 15 (Figure 5). On the left of Figure 5, it is also possible to see an aromatic hydrogen bonding with Aspartate 20 (Asp 20).

Molecule 831, named: 4-[6-[2-[2-[1-(1, 3-benzodioxol-5-yl)cyclopropyl]-2-oxoethyl]pyridin-3-yl]benzoic acid, is an organic acid structurally different from 773 and molecules derived from Formononetin. It has in its structure a pyridine linked to a carbonyl and a cyclopropane (Figure 6). This molecule is widely studied, mainly because of its potential to modulate ABC (ATP Binding Cassette), a protein that is responsible for multidrug resistance and is involved in diseases such as Alzheimer’s, Amyotrophic Lateral Sclerosis, mucopolysaccharidosis.[21]

Figure 6: 2D representation of the 831 molecule (left), and the 3D representation coupled to 1PZ4 (right).

The benzyl carboxylic group was directed toward the external opening of the hydrophobic pocket, similar to compound 773. As a result, only one hydrogen bonding type interaction occurs between the main chain residue, Val 26, and the hydroxyl of the acid group. The non-covalent type interaction was the pi-pi stacking interaction with the phenylalanine residue 105 (Phe 105). Pi-pi stacking bond occurs between two aromatic rings, which can be parallel to each other, known as a sandwich (face-to-face) interaction, as seen in Figure 7, side-to-side or Boda-face interaction.[22]

Figure 7: Molecule 831 (left) coupled to the protein, forming hydrogen bonds with Val 26 (yellow dots), and pi-pi stacking bonds (purple) with Phe 105 (right).

CONCLUSION

In this paper, we evidenciated natural product analogs with potencial against Aedes aegypti mosquitoes. Among the most stable compounds evaluated by dockings, the results emphasizes the isoflavonoid class as the best potential to interruption of the mosquito’s life cicle. The synthetic obtention of these analogs has a simpler methodology and the reagents used are economically accessible, making them promising candidates for Sterol Carrier Protein-2 inhibition. Therefore, this work encourages the experimental evaluation of formononetin and analogs.

ACKNOWLEDGEMENT

The authors would like to thank the Coordination of Improvement of Higher Level Personnel (CAPES), National Council for Scientific and Technological Development (CNPq), and Foundation of Support to the Science and Technology of the State of Pernambuco (FACEPE) for the scholarship granted for the students.

CONFLICT OF INTEREST

The authors declare no conflict of interest.

ABBREVIATIONS

SCP-2: Steroid Carrier Protein-2; GLUT4: Insulin-Sensitive Glucose Transporter; MD: molecular docking; RDK: redocking.

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GRAPHICAL ABSTRACT

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Cite this article: Lima SYEMD, Silva ARND, Leal CEY, Filho EBDA. Virtual Screening of Fargesin Analogs as Candidates as Inhibitors of Aedes aegypti Sterol Carrier Protein. Pharmacog Res. 2022;14(1):12-8.