Related Experiment Video
Updated: May 3, 2026

Assessing Cellular Target Engagement by SHP2 PTPN11 Phosphatase Inhibitors
Published on: July 17, 2020
The cellular target specificity of pateamine A
James H Matthews1, David R Maass1, Peter T Northcote1
1Centre for Biodiscovery, Victoria University of Wellington, Wellington 6012, New Zealand.
Pateamine A, a natural compound, inhibits eukaryotic initiation factor 4A (eIF4A) and affects cell division. While it also impacts actin and tubulin, these are not its primary cellular targets.
Area of Science:
- Natural product chemistry
- Cell biology
- Biochemistry
Background:
- Pateamine A is a natural product isolated from the sponge Mycale hentscheli.
- It exhibits activity against various dividing cells.
- Previous studies indicated its role in inhibiting eukaryotic initiation factor 4A (eIF4A).
Purpose of the Study:
- To investigate the mode of action of pateamine A.
- To identify additional cellular targets of pateamine A.
- To determine the relationship between eIF4A inhibition and effects on cytoskeletal components.
Main Methods:
- In vitro assays to assess modulation of actin filament and microtubule formation.
- Cell cycle analysis to evaluate the cellular activity of pateamine A.
- Biochemical assays to confirm inhibition of eIF4A.
Main Results:
- Pateamine A inhibits eIF4A function at lower concentrations.
- Pateamine A modulates actin filament and microtubule formation at higher concentrations.
- Cell cycle analysis indicated that actin and tubulin are not the primary mediators of pateamine A's cellular activity.
Conclusions:
- Pateamine A's primary cellular activity is mediated through the inhibition of eIF4A.
- Effects on actin and tubulin are secondary and occur at higher concentrations.
- Multiple approaches are valuable for elucidating the mode of action of bioactive compounds.
More Related Videos
07:16Methods for the Discovery of Novel Compounds Modulating a Gamma-Aminobutyric Acid Receptor Type A Neurotransmission
Published on: August 16, 2018
07:41A Kinetic Fluorescence-based Ca2+ Mobilization Assay to Identify G Protein-coupled Receptor Agonists, Antagonists, and Allosteric Modulators
Published on: February 20, 2018
Related Concept Videos
Dose-Response Relationship: Selectivity and Specificity
Targets for Drug Action: Overview
Receptors are either membrane-spanning or intracellular proteins, which upon binding a ligand, get activated and transmit the signal downstream to elicit a response. Drugs bind receptors, either mimicking the action of endogenous ligands or blocking the receptor activity to bring about a modified response. Nearly 35% of approved drugs target the G...
Transducer Mechanism: Enzyme-Linked Receptors
Major types that are helpful drug targets include:
Adrenergic Receptors: ɑ Subtype
Adrenaline ≥ Noradrenaline >> Isoprenaline
α-adrenoceptors are further divided into α1 and α2-adrenoceptors.
α1-Adrenoceptors: These receptors are located postsynaptically on the effector organs and cause constriction of smooth muscle mediated by activation of phospholipase...
Pharmacogenetics of Drug Targets: β₂-Adrenergic Receptors, Apo E, Thymidylate Synthase
Physical Properties of Amines