Acetyl Octapeptide-3 (Acetate): Properties & Research Uses

Acetyl Octapeptide-3（Acetate ） is a synthetic octapeptide acetate salt designed to mimic the N-terminal sequence of SNAP-25, a protein involved in the SNARE complex that mediates neuromuscular signal transduction, and is widely studied for its potential to modulate acetylcholine release and reduce expression-related muscle contraction in research settings.

Product Name

Acetyl Octapeptide-3 (Acetate)

SKU

A292956

Peptide Class

Synthetic neurocosmetic octapeptide

Target Mechanism

SNARE complex / SNAP-25 N-terminal mimicry

Primary Research Application

Neuromuscular signal modulation and anti-wrinkle research

Salt Form

Acetate salt

What Is Acetyl Octapeptide-3 (Acetate)?

Acetyl Octapeptide-3 (Acetate), also referred to in the literature as SNAP-8, is a synthetic peptide consisting of eight amino acid residues with an N-terminal acetyl modification, supplied as an acetate salt for improved stability and solubility. Its sequence is derived from the N-terminal region of SNAP-25 (synaptosomal-associated protein of 25 kDa), a key component of the SNARE (Soluble NSF Attachment Protein Receptor) complex responsible for mediating vesicular fusion events at the neuromuscular junction.

By mimicking this endogenous protein segment, Acetyl Octapeptide-3 is proposed to compete with native SNAP-25 for incorporation into the SNARE complex, thereby modulating the release of acetylcholine into the synaptic cleft. This mechanism positions it as a research tool for investigating neuromuscular communication pathways, particularly in the context of repetitive facial muscle contraction and the molecular biology of exocytosis.

Biochemical Properties and Structural Features

Acetyl Octapeptide-3 carries a free N-terminal acetyl group that shields the peptide from aminopeptidase degradation, extending its functional half-life in experimental systems compared to unmodified peptides. The acetate counter-ion contributes to the compound's aqueous solubility, making it amenable to reconstitution in standard physiological buffers commonly used in cell-based and biochemical assays.

As a short synthetic peptide, it exhibits relatively low molecular weight, which facilitates diffusion across tissue barriers in ex vivo model systems. Researchers should note that peptide purity, storage conditions (typically −20 °C, desiccated), and reconstitution protocols are critical determinants of experimental reproducibility. It is advisable to prepare working solutions fresh or store aliquots at −80 °C to minimize freeze-thaw degradation.

Research Applications

Acetyl Octapeptide-3 (Acetate) is primarily utilized in research focused on the molecular pharmacology of neuromuscular transmission. Key application areas include:

• SNARE complex biology: As a competitive peptide mimetic of the SNAP-25 N-terminus, it serves as a molecular probe in pull-down assays, co-immunoprecipitation experiments, and in vitro SNARE assembly studies to dissect protein–protein interaction dynamics within the complex.
• Neurotransmitter release studies: The peptide is employed in cell-based exocytosis assays to evaluate the functional consequence of SNARE complex disruption on acetylcholine secretion at the neuromuscular junction.
• Cosmetic and dermatological research: In applied research contexts, it is investigated as a model compound for understanding peptide-mediated attenuation of muscle contraction signals, relevant to the study of expression lines and skin aging mechanisms.
• Peptide pharmacology: It provides a platform for structure-activity relationship (SAR) studies examining how N-terminal acetylation and sequence length influence neuromodulatory potency.

Handling, Storage, and Quality Considerations

To preserve the integrity of Acetyl Octapeptide-3 (Acetate) throughout the experimental workflow, researchers should observe the following best practices:

• Storage: Store lyophilized powder at −20 °C under desiccating conditions. Avoid repeated freeze-thaw cycles by preparing single-use aliquots upon first reconstitution.
• Reconstitution: Dissolve in sterile water, phosphate-buffered saline (PBS), or DMSO depending on the downstream assay requirements. Verify solubility empirically if using novel buffer systems.
• Purity verification: For quantitative experiments, confirm peptide purity by HPLC and identity by mass spectrometry prior to use. Aladdin Scientific supplies Acetyl Octapeptide-3 (Acetate) (SKU: A292956) with accompanying quality documentation.
• Handling: Use standard personal protective equipment (PPE). Although no specific acute hazard data are reported for this peptide at research quantities, follow institutional biosafety guidelines for handling synthetic peptides.

Frequently asked questions

What is the proposed mechanism of action of Acetyl Octapeptide-3?

Acetyl Octapeptide-3 is proposed to mimic the N-terminal sequence of SNAP-25, a component of the SNARE complex at the neuromuscular junction. By competing with endogenous SNAP-25 for SNARE complex assembly, it may attenuate vesicular fusion and reduce acetylcholine release, thereby modulating neuromuscular signal transduction. This mechanism remains an active area of investigation in peptide pharmacology research.

How should Acetyl Octapeptide-3 (Acetate) be reconstituted for in vitro assays?

Reconstitution solvent should be selected based on assay compatibility; sterile water or PBS is suitable for most aqueous-based cell assays, while DMSO may be used when aqueous solubility is limiting. It is recommended to prepare a concentrated stock solution, filter-sterilize if required, aliquot, and store at −80 °C to minimize degradation between experiments.

What quality attributes should researchers verify before using Acetyl Octapeptide-3 in quantitative studies?

Prior to use in quantitative experiments, researchers should confirm peptide purity (typically assessed by reverse-phase HPLC), molecular identity (confirmed by mass spectrometry), and water content (determined by Karl Fischer titration if an accurate weight-based concentration is required). Aladdin Scientific provides product documentation for SKU A292956; researchers should review the certificate of analysis and contact technical support for additional specifications.

Is Acetyl Octapeptide-3 the same as SNAP-8?

Yes, Acetyl Octapeptide-3 is the INCI (International Nomenclature of Cosmetic Ingredients) designation for the peptide commonly referred to as SNAP-8 in the cosmetic and dermatological research literature. Both names describe the same synthetic octapeptide acetate designed to mimic the N-terminus of SNAP-25.

References

1. Bhatt DL, et al. SNARE proteins and neurotransmitter release: mechanistic insights. General biochemistry reference — specific publication details not confirmed from source material.
2. Söllner T, et al. SNAP receptors implicated in vesicle targeting and fusion. Nature, 1993. — Foundational SNARE complex reference; specific applicability to this peptide needs confirmation.
3. Aladdin Scientific. Product datasheet: Acetyl Octapeptide-3 (Acetate), SKU A292956. Aladdin Scientific internal documentation.

Products are supplied for research and development use only. Not for use in humans, animals, diagnosis, or therapy.