Investigating the binding affinity of andrographolide against human SARS-CoV-2 spike receptor-binding domain through docking and molecular dynamics simulations

Bhattarai et al., Journal of Biomolecular Structure and Dynamics, doi:10.1080/07391102.2023.2174596, Feb 2023
In silico study showing that andrographolide binds strongly to the SARS-CoV-2 spike protein receptor-binding domain (RBD). Authors used molecular docking and dynamics simulations to demonstrate that andrographolide forms stable non-covalent interactions with the RBD, leading to conformational changes that stabilize the complex. The ligand-bound RBD showed reduced conformational fluctuations compared to the unbound form, suggesting potential interference with ACE2 receptor binding and viral entry.
25 preclinical studies support the efficacy of andrographolide for COVID-19:
In vitro studies demonstrate inhibition of the MproA,18 protein. In vitro studies demonstrate efficacy in Calu-3B,18, A549C,14, and HUVECD,18 cells. Animal studies demonstrate efficacy in Sprague Dawley miceE,18 and Golden Syrian hamstersF,14. Andrographolide inhibits Mpro in a dose-dependent manner18, reduces ACE2 levels in the lung tissue of mice in combination with baicalein18, inhibits binding between the SARS-CoV-2 spike protein and ACE218, alleviates lung inflammation and cytokine storm in mice18, and improves survival and reduces lung inflammation via anti-inflammatory effects in Syrian hamsters14.
a. The main protease or Mpro, also known as 3CLpro or nsp5, is a cysteine protease that cleaves viral polyproteins into functional units needed for replication. Inhibiting Mpro disrupts the SARS-CoV-2 lifecycle within the host cell, preventing the creation of new copies.
b. Calu-3 is a human lung adenocarcinoma cell line with moderate ACE2 and TMPRSS2 expression and SARS-CoV-2 susceptibility. It provides a model of the human respiratory epithelium, but many not be ideal for modeling early stages of infection due to the moderate expression levels of ACE2 and TMPRSS2.
c. A549 is a human lung carcinoma cell line with low ACE2 expression and SARS-CoV-2 susceptibility. Viral entry/replication can be studied but the cells may not replicate all aspects of lung infection.
d. HUVEC (Human Umbilical Vein Endothelial Cells) are primary endothelial cells derived from the vein of the umbilical cord. They are used to study vascular biology, including inflammation, angiogenesis, and viral interactions with endothelial cells.
e. An outbred multipurpose breed of albino mouse used extensively in medical research.
f. A rodent model widely used in infectious disease research due to their susceptibility to viral infections and similar disease progression to humans.
Bhattarai et al., 10 Feb 2023, peer-reviewed, 3 authors.
In silico studies are an important part of preclinical research, however results may be very different in vivo.
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