From:  Molecular mechanism analysis and network pharmacology of capsaicin in Alzheimer’s and Parkinson’s diseases: an in silico study

 Binding free energies and energy components of protein-CAP complexes calculated using the MM/PBSA approach.

ComplexAverage binding energy (kcal/mol)
ΔEvdwΔEeleΔGpolΔGnonpolaΔGbind
ESR1–48.69–6.5720.32–4.00–38.94 ± 3.38
HMOX1–33.73–14.0625.47–4.50–26.83 ± 4.99
NGF–36.58–8.6022.82–4.10–26.45 ± 3.93
SIRT1–38.77–7.8024.68–4.65–26.54 ± 7.76

aΔGbind represents the total binding free energy calculated as the sum of all individual energy components (ΔGbind = ΔEvdw + ΔEele + ΔGpol + ΔGnonpol), and expressed as mean ± standard deviation. CAP: capsaicin; MM/PBSA: Molecular Mechanics Poisson-Boltzmann Surface Area; ESR1: estrogen receptor 1; HMOX1: heme oxygenase 1; NGF: nerve growth factor; SIRT1: sirtuin 1.