3 years ago

Molecular docking, binding free energy analysis, and biological evaluation of bisabolonalone hydrazone carboxamides as H + ,K + -ATPase reversible inhibitors

Qing Dong, Xin-Xin She, Kun Zou, Hua-Jun Luo, Nian-Yu Huang, Jun-Zhi Wang, Wei-Qiao Deng

Abstract

The interaction mechanisms of a series of bisabolonalone hydrazone carboxamides as H+,K+-ATPase reversible inhibitors were studied by molecular docking, QM/MM calculation, and MM/GBSA binding free energy analysis methods. The correlation coefficient, R, between calculated ΔG bind (the binding free energy with H+,K+-ATPase homology model) and experimental pIC50 (negative logarithms of 50% inhibition concentration) of ligands is −0.9386. A suitable molecular volume of ligand is needed to dock into the whole binding pocket, which includes Gln127–Leu141 in the loop of TM1–TM2; Arg328–Ala335 in the loop of TM4; Tyr799–Thr815 in the loop of TM5–TM6; Trp899–Phe917 in the loop of TM7–TM8; Leu921–Tyr928 in the loop of TM8; and Asn986–Asn989 in the loop of TM9–TM10. By the decomposed energy comparisons of residues in binding sites, the naphthyl group substituting benzene ring in bisabolonalone hydrazone carboxamides could increase the hydrophobic interaction with Cys813, which is a very important binding site for enhancing the inhibition activity. In addition, Asp137 is another key residue binding with ligand through the hydrogen bond and electrostatic interactions. The results of this analysis could help in further rational design of novel H+,K+-ATPase reversible inhibitors.

Publisher URL: https://link.springer.com/article/10.1007/s00044-017-2048-x

DOI: 10.1007/s00044-017-2048-x

You might also like
Never Miss Important Research

Researcher is an app designed by academics, for academics. Create a personalised feed in two minutes.
Choose from over 15,000 academics journals covering ten research areas then let Researcher deliver you papers tailored to your interests each day.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.