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Respirometric Oxidative Phosphorylation Assessment in Saponin-permeabilized Cardiac Fibers
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Cytotoxic Desulfated Saponin from

Md Shahinozzaman1,2, Takahiro Ishii3,4, Ryo Takano5

  • 1The United Graduate School of Agricultural Sciences, Kagoshima University, Korimoto 1-21-24, Kagoshima 890-0065, Japan. mshahin81@gmail.com.

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|September 12, 2018
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Summary

A novel sea cucumber compound, desulfated echinoside B (DEB), exhibits potent cytotoxicity against cancer cells. DEB also shows promise as a natural allosteric inhibitor of p21-activated kinase 1 (PAK1).

Keywords:
Holothuria atradesulfated echinoside Bmolecular dockingmolecular dynamicsp21-activated kinase 1

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Area of Science:

  • Marine natural products
  • Biochemistry
  • Computational chemistry

Background:

  • Sea cucumbers are traditionally used for health benefits.
  • Marine organisms are a source of bioactive compounds.
  • p21-activated kinase 1 (PAK1) is implicated in cancer progression.

Purpose of the Study:

  • To investigate the cytotoxic potential of sea cucumber species.
  • To isolate and characterize bioactive saponins from Holothuria atra.
  • To evaluate the inhibitory activity of desulfated echinoside B (DEB) against PAK1.

Main Methods:

  • Bioassay-guided fractionation and LC-ESI-MS for compound isolation and identification.
  • In vitro cytotoxicity assays against cancer cells and brine shrimp.
  • Molecular docking and molecular dynamics simulations to assess PAK1 binding.

Main Results:

  • Holothuria atra yielded desulfated echinoside B (DEB) with significant cytotoxicity (IC50 0.5–2.5 µM).
  • DEB demonstrated strong binding to an allosteric site on PAK1, surpassing frondoside A (FRA).
  • Molecular dynamics simulations confirmed DEB's stable complex formation with PAK1.

Conclusions:

  • DEB is a potent cytotoxic agent derived from sea cucumbers.
  • DEB and FRA function as natural allosteric PAK1 inhibitors.
  • DEB shows greater potential as a PAK1 inhibitor compared to FRA.