Mastoparan

A 14-amino-acid peptide from wasp venom, Mastoparan is a research tool for directly activating G-proteins and studying membrane disruption.

Length: 14 amino acids
Half-life: Not well characterised
Mechanism: It directly activates G-proteins by mimicking an activated G-protein-coupled receptor (GPCR), and can also disrupt cell membranes.
Studied in: It is used as a laboratory tool to study G-protein signaling pathways and to investigate membrane-peptide interactions.

About Mastoparan

Mastoparan is a tetradecapeptide (14 amino acids) and a principal toxic component of wasp venom. Structurally, it forms an amphipathic alpha-helix, which is key to its biological functions. In cell biology, it is widely used as a pharmacological tool to investigate signal transduction.

Its primary mechanism of interest is the direct activation of heterotrimeric G-proteins, bypassing the need for a ligand-bound receptor. By mimicking the intracellular loops of a G-protein-coupled receptor (GPCR), it forces the exchange of GDP for GTP on the Gα subunit, initiating downstream signaling. At higher concentrations, it also exerts lytic activity by disrupting cell membranes, a property it shares with many antimicrobial peptides.

Laboratory notes

Mastoparan is a potent secretagogue in many cell types (e.g., mast cells, chromaffin cells); this should be considered in experimental design.
Use with caution in cell culture, as it can be cytotoxic at micromolar concentrations due to membrane permeabilization.
For G-protein activation assays, concentrations are typically in the low micromolar range, while lytic effects are seen at higher concentrations.

Storage and reconstitution basics: storage guide.

Questions about Mastoparan

Is Mastoparan's primary use antimicrobial?

While it has antimicrobial properties, it is more commonly used in research as a direct activator of G-proteins to study cellular signaling.

How does it activate G-proteins?

It structurally mimics the active conformation of a GPCR, binding directly to the Gα subunit and stimulating the release of GDP, which allows GTP to bind and activate the protein.

Is it specific to one type of G-protein?

It primarily activates G-proteins of the Gi/Go family but can interact with others, showing a degree of promiscuity that varies with experimental conditions.

Is Mastoparan for human use?

No. It is supplied strictly for in-vitro laboratory research and is not for human or animal consumption.

Related research peptides

All products are sold for laboratory research use only. Not for human consumption, not a medicine, not for diagnosing, treating or preventing any condition.