In silico homology modeling of dengue virus non-structural 4B (NS4B) protein and its molecular docking studies using triterpenoids.

Sajid Ali, Usman Ali, Khushboo Safi, Falak Naz, Muhammad Ishtiaq Jan, Zafar Iqbal, Tahir Ali, Riaz Ullah, Ahmed Bari
Author Information
  1. Sajid Ali: Department of Chemistry, Bacha Khan University, Charsadda, Khyber Pakhtunkhwa, Pakistan. sajidali.faculty@bkuc.edu.pk.
  2. Usman Ali: Department of Chemistry, Bacha Khan University, Charsadda, Khyber Pakhtunkhwa, Pakistan.
  3. Khushboo Safi: Department of Chemistry, Bacha Khan University, Charsadda, Khyber Pakhtunkhwa, Pakistan.
  4. Falak Naz: Department of Chemistry, Bacha Khan University, Charsadda, Khyber Pakhtunkhwa, Pakistan.
  5. Muhammad Ishtiaq Jan: Department of Chemistry, Kohat University of Science and Technology, Kohat, 26000, Khyber Pakhtunkhwa, Pakistan.
  6. Zafar Iqbal: College of Medicine, King Saud University, P.O.Box 7805, Riyadh, 11472, Kingdom of Saudi Arabia.
  7. Tahir Ali: State Key Laboratory of Chemical Oncogenomics, Guangdong Provincial Key Laboratory of Chemical Genomics, Peking University Shenzhen Graduate School, Shenzhen, 518055, Guangdong, PR China.
  8. Riaz Ullah: Department of Pharmacognosy, College of Pharmacy, King Saud University, Riyadh, 11451, Kingdom of Saudi Arabia.
  9. Ahmed Bari: Department of Pharmaceutical Chemistry, College of Pharmacy, King Saud University, Riyadh, 11451, Kingdom of Saudi Arabia.

Abstract

BACKGROUND: Dengue fever has become a significant worldwide health concern, because of its high morbidity rate and the potential for an increase in mortality rates due to lack of adequate treatment. There is an immediate need for the development of effective medication for dengue fever.
METHODS: Homology modeling of dengue virus (DENV) non-structural 4B (NS4B) protein was performed by SWISS-MODEL to predict the 3D structure of the protein. Structure validation was conducted using PROSA, PROCHECK, Ramachandran plot, and VERIFY-3D. MOE software was used to find out the in-Silico inhibitory potential of the five triterpenoids against the DENV-NS4B protein.
RESULTS: The SWISS-MODEL was employed to predict the three-dimensional protein structure of the NS4B protein. Through molecular docking, it was found that the chosen triterpenoid NS4B protein had a high binding affinity interaction. It was observed that the NS4B protein binding energy for 15-oxoursolic acid, betulinic acid, ursolic acid, lupeol, and 3-o-acetylursolic acid were - 7.18, - 7.02, - 5.71, - 6.67 and - 8.00 kcal/mol, respectively.
CONCLUSIONS: NS4B protein could be a promising target which showed good interaction with tested triterpenoids which can be developed as a potential antiviral drug for controlling dengue virus pathogenesis by inhibiting viral replication. However, further investigations are necessary to validate and confirm their efficacy.

Keywords

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MeSH Term

Viral Nonstructural Proteins
Molecular Docking Simulation
Triterpenes
Dengue Virus
Antiviral Agents
Protein Binding
Humans
Dengue
Protein Conformation
Membrane Proteins

Chemicals

Viral Nonstructural Proteins
Triterpenes
Antiviral Agents
NS4B protein, Dengue virus
Membrane Proteins

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