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Insights from molecular docking and molecular dynamics on the potential of vitexin as an antagonist candidate against lipopolysaccharide (LPS) for microglial activation in neuroinflammation

Authors
  • Yahaya, M. A. F.1
  • Bakar, A. R. Abu2
  • Stanslas, J.1
  • Nordin, N.1
  • Zainol, M.3
  • Mehat, M. Z.1
  • 1 Universiti Putra Malaysia (UPM), Serdang, Selangor, 43400, Malaysia , Serdang (Malaysia)
  • 2 Universiti Malaysia Perlis (UniMAP), Kangar, Perlis, 01000, Malaysia , Kangar (Malaysia)
  • 3 Institute for Medical Research (IMR), National Institute of Health (NIH), Jalan Setia Murni U13/52, Seksyen U13, Bandar Setia Alam, Shah Alam, Selangor, 40170, Malaysia , Shah Alam (Malaysia)
Type
Published Article
Journal
BMC Biotechnology
Publisher
Springer (Biomed Central Ltd.)
Publication Date
Jun 05, 2021
Volume
21
Issue
1
Identifiers
DOI: 10.1186/s12896-021-00697-4
Source
Springer Nature
Keywords
License
Green

Abstract

BackgroundNeuroinflammation has been identified to be the key player in most neurodegenerative diseases. If neuroinflammation is left to be unresolved, chronic neuroinflammation will be establish. Such situation is due to the overly-activated microglia which have the tendency to secrete an abundance amount of pro-inflammatory cytokines into the neuron microenvironment. The abundance of pro-inflammatory cytokines will later cause toxic and death to neurons. Toll-like receptor 4 (TLR4)/MD-2 complex found on the cell surface of microglia is responsible for the attachment of LPS and activation of nuclear factor-κB (NF-κB) downstream signalling pathway. Albeit vitexin has been shown to possess anti-inflammatory property, however, little is known on its ability to bind at the binding site of TLR4/MD-2 complex of microglia as well as to be an antagonist for LPS.ResultsThe present study reveals that both vitexin and donepezil are able to bind at the close proximity of LPS binding site located at the TLR4/MD-2 complex with the binding energy of − 4.35 and − 9.14 kcal/mol, respectively. During molecular dynamic simulations, both vitexin and donepezil formed stable complex with TLR4/MD-2 throughout the 100 ns time length with the root mean square deviation (RMSD) values of 2.5 Å and 4.0 Å, respectively. The root mean square fluctuation (RMSF) reveals that both compounds are stable. Interestingly, the radius of gyration (rGyr) for donepezil shows notable fluctuations when compare with vitexin. The MM-GBSA results showed that vitexin has higher binding energy in comparison with donepezil.ConclusionsTaken together, the findings suggest that vitexin is able to bind at the binding site of TLR4/MD-2 complex with more stability than donepezil throughout the course of 100 ns simulation. Hence, vitexin has the potential to be an antagonist candidate for LPS.

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