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Molecular docking and molecular dynamics study on SmHDAC1 to identify potential lead compounds against Schistosomiasis

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Abstract

Schistosomiasis, a disease caused by helminth parasites of genus Schistosoma. Its treatment intensively depends on single drug, praziquantel which increases the risk of development of drug-resistant parasite. Inhibitors of human HDAC are profoundly reported as novel anti-cancer drugs and used as new anit-parasitic agents. Schistosoma monsoni class I HDACs are expressed in all stages of life cycle and indicating that this enzyme is most likely a major target for the designing specific inhibitors. In order to find novel target for the treatment of Schistosomiasis, three dimensional structure of SmHDAC1 was generated, using homology modelling. Features of the generated structure, was then deduced with respect to conformation of peptide backbone, local compatibility of the generated structure in terms of energy and molecular dynamics study. Considering these features of the generated structure, we selected all the class 1 inhibitors reported so far, which showed interactions with HDACs. Virtual screening was done using reported inhibitors (70) and using SmHDAC1 and HsHDAC1 as the targets. On the basis of binding affinity and IC50 value, 24th ligand was selected for the molecular docking purpose. In this study, out of all the reported inhibitors, 24th inhibitor (N,8-dihydroxy-8-(naphthalen-2-yl) octanamide zinc id- ZINC13474421) showed better binding with SmHDAC1 (−8.1 kcal/mol) as compared to HsHDAC1 (−6.4 kcal/mol) in terms of binding energy and supported by IC50 value. This paper throws light on the reliable model for further structure based drug designing, concerning SmHDAC1 of S. mansoni. Molecular docking studies highlighted advantages of comparative in silico interaction studies of SmHDAC1 and HsHDAC1. N,8-dihydroxy-8-(naphthalen-2-yl) octanamide can further use for the clinical trial.

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Acknowledgments

This is my PhD work, supported by University Grant Commission, New Delhi, India. We thank, Dr. Navneet Mishra for is valuable suggestions, Mr. Surya Pratap singh for his critical reading and scientific discussions, and Miss Pallavi Gaur for editing the manuscript and Miss Swadha Singh for critical reading of early versions of the manuscript. Constructive comments from them helped us to make the manuscript more accurate. We apologize to our colleagues whose relevant work has not being cited because of the space limitations.

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Correspondence to Raghvendra Singh.

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11033_2014_3816_MOESM1_ESM.tif

Figure S1. a, b, c, d and e represent geometry of Metal binding domain of modeled SmHDAC1 and human Class I HDACs respectively. HDAC has Zn2+ ion (cofactor) in the catalytic site, which is bound to three amino acid (two aspartic acid and one histidine) residues. (TIFF 2118 kb)

11033_2014_3816_MOESM2_ESM.tif

Figure S2. Ramachandran plots of Human HDAC1(4BKX) and SmHDAC1. SmHDAC shows numbers of residues in favoured region are 311(96.0 %), in allowed regions are 11(3.4 %) and in outliers is 2 (0.6 %) Numbers of residues in favoured region are 349(95.1 %), in allowed regions are 17(4.16 %) and in outliers is 1 (0.3 %). Ramachandran plot of SmHDAC1 shows satisfactory result while comparing with HsHDAC1 (3BKX).(TIFF 391 kb)

11033_2014_3816_MOESM3_ESM.tiff

Figure S3. Upper left to right panel represent Z-score plot, representing Z-score values of proteins (resolved by NMR and X-ray and submitted in PDB). In this plot two dark black points represent Z-scores of the modeled protein template HsHDAC1 (PDB ID: 4BKXB) and SmHDAC1 respectively. In lower panel, left to right represent knowledge based energy profile of the modeled SmHDAC1 in comparison to the crystal structure of human HDAC1 (4BKXB). The trend of the variation of the protein folding energy in SmHDAC1 model is in good harmony with that of the crystal structure of human HDAC1 (4BKXB). (TIFF 8779 kb)

Figure S4. Comparison of WHAT IF packing scores of modeled SmHDAC1 and X-ray structure of HsHDAC1. (TIFF 11975 kb)

11033_2014_3816_MOESM5_ESM.tif

Figure S5 Radius of gyration for SmHDAC1. The x-axis represents the time in ps and y-axis represents radius in nm. (TIFF 163 kb)

11033_2014_3816_MOESM6_ESM.tif

Figure S6. (A) Superimposition of SmHDAC1 and crystal structure of HsHDAC1 (PDB id: 4BKX) both structures adopt almost similar fold pattern. Spheres represent Zn ion and K ions. (B,C) SmHDAC1 (HsHDAC1), helices are represented by green (red), beta sheaths are in pink (purple), metal ions are presented in purple colour (Zn++ ion comparatively smaller than K+) and turns are presented in gray colour. Their catalytic zinc ion is found at the same position. (TIFF 4034 kb)

11033_2014_3816_MOESM7_ESM.tif

Figure S7. Trajectory of backbone atoms (RMSD) of SmHDAC1 with snapshot 2 ns time steps. Stability of inter- and intra-domain movements in SmHDAC1 were analysed in terms of RMSD fluctuation of backbone atoms and were found to be small in the system studied. (TIFF 2156 kb)

11033_2014_3816_MOESM8_ESM.tif

Figure S8. Secondary structure and fold comparison between homology model and X-ray structure of SmHDAC1(B) and HsHDAC1(A) respectively. E: β-strand, H: α-helix, T: turn, G: 310-helix, B: breaker. (TIFF 305 kb)

11033_2014_3816_MOESM9_ESM.tif

Figure S9. (A)Residue-wise RMSF profiles of the SmHDAC1 and DSSP analysis (B,C). There are two major fluctuating regions are present in SmHDAC1. From residue number 45-52 and 266-293. These are the parts of loop regions. Band C represent transition states of of secondary structure over the simulation of 10 ns time period. (TIFF 1061 kb)

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Singh, R., Pandey, P.N. Molecular docking and molecular dynamics study on SmHDAC1 to identify potential lead compounds against Schistosomiasis. Mol Biol Rep 42, 689–698 (2015). https://doi.org/10.1007/s11033-014-3816-z

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