Potent inhibitions of monoamine oxidase A and B by acacetin and its 7-O-(6-O-malonylglucoside) derivative from Agastache rugosa

Int J Biol Macromol. 2017 Nov;104(Pt A):547-553. doi: 10.1016/j.ijbiomac.2017.06.076. Epub 2017 Jun 19.


Five compounds were isolated from the leaves of Agastache rugosa and tested for monoamine oxidase (MAO) inhibitory activity. Acacetin, a flavonoid, potently inhibited recombinant human MAO-A and MAO-B (IC50=0.19 and 0.17μM, respectively), and reversibly and competitively inhibited MAO-A and MAO-B (Ki=0.045 and 0.037μM, respectively). Acacetin 7-O-(6-O-malonylglucoside) (AMG) was also found to effectively inhibit MAO-A and MAO-B (IC50=2.34 and 1.87μM, respectively), and to reversibly and competitively inhibit MAO-A and MAO-B (Ki=1.06 and 0.38μM, respectively). Tilianin (a glucoside derivative of acacetin) had little inhibitory activity, but the introduction of a malonyl group at sugar moiety significantly increased inhibitory activity. Molecular docking simulation revealed the binding energy of acacetin for MAO-B (-44.2kcal/mol) was greater than its energy for MAO-A (-27.0kcal/mol), and that the Cys172 residue of MAO-B was important for hydrogen bonding with acacetin. AMG was predicted to bind to MAO-B with an energy of -23.1kcal/mol by possible hydrogen-bond formation between an oxygen atom of Ile477 residue and a hydrogen atom (H17) of AMG. However, the interaction between AMG and MAO-A was not verified by the docking simulation. This study suggests acacetin and AMG be viewed as new reversible MAO inhibitors, and useful lead compounds for the inhibitor development.

Keywords: Acacetin; Acacetin 7-O-(6-O-malonylglucoside); Monoamine oxidase inhibition.

MeSH terms

  • Agastache / chemistry*
  • Flavones / chemistry*
  • Flavones / metabolism
  • Flavones / pharmacology*
  • Glucosides / chemistry*
  • Humans
  • Inhibitory Concentration 50
  • Molecular Docking Simulation
  • Monoamine Oxidase / chemistry
  • Monoamine Oxidase / metabolism*
  • Monoamine Oxidase Inhibitors / chemistry*
  • Monoamine Oxidase Inhibitors / metabolism
  • Monoamine Oxidase Inhibitors / pharmacology*
  • Protein Conformation
  • Structure-Activity Relationship


  • Flavones
  • Glucosides
  • Monoamine Oxidase Inhibitors
  • Monoamine Oxidase
  • acacetin