In-silico studies on Myo inositol-1-phosphate synthase of Leishmania donovani in search of anti-leishmaniasis

Abstract

Myo-inositol is one of the vital nutritional requirements for the Leishmania parasites’ survival and virulence in the mammalian host. . Myo-inositol-1-phosphate synthase (MIPS) is responsible for the synthesis of myo-inositol in Leishmania, which plays a vital role in Leishmania’s virulence to mammalian hosts. Earlier studies suggest MIP synthase as a potential drug target against which valproate was used as a drug. So, MIP synthase can be used as a target for anti-leishmanial drugs, and its inhibition may help in preventing leishmaniasis. The present study aims to identify valproate's potent analogs as drugs against MIP synthase of L. donovani (Ld-MIPS) with minimum side effects and toxicity to host.

In this study, the three-dimensional structure of Ld-MIPS was built, followed by active site prediction. Ligand-based virtual screening was done using hybrid similarity recognition methods. The best 123 valproate analogs were filtered based on their quantitative structure activity relationship (QSAR) properties and were docked against Ld-MIPS using FlexX, PyRx and iGEMDOCK software. The topmost five ligands were selected for molecular dynamics simulation and pharmacokinetic analysis based on the docking score. Simulation studies up to 30 ns revealed that all five lead molecules bound with Ld-MIPS throughout MD simulation and there was no variation in their backbone. All the chosen inhibitors exhibited good pharmacokinetics/ADMET predictions with an excellent absorption profile, metabolism, oral bioavailability, solubility, excretion, and minimal toxicity, suggesting that these inhibitors may further be developed as anti-leishmaniasis drugs to prevent the spread of leishmaniasis.

Communicated by Ramaswamy H. Sarma

Keywords:

• Leishmania donovani
• virtual screening
• molecular docking
• molecular dynamic simulation
• Myo inositol-1-phosphate synthase
• ADMET

Disclosure statement

The authors declare that no conflict of interest exists.

Additional information

Funding

The lab is supported by the Science and Engineering Research Board, India (FILE NO. ECR/2015//000155) and the Department of Biotechnology (India) (order no: BT/PR16224/NER/95/176/2015 & BT/PR24504/ NER/95/746/2017) to Dr. Diwakar Kumar. Mousumi Sinha acknowledges the financial support (Non-NET Fellowship) from Assam University, Silchar. We are thankful to Prof. Manabendra Dutta Choudhury, Dr. Anupom Das Talukdar and Dr. Monjur Laskar for extending Bioinformatics centre facilities to us.