MOTS-c(human) Acetate: Handling & Reconstitution Protocol

MOTS-c(human) acetate is a mitochondria-derived peptide reagent supplied as a lyophilized acetate salt, requiring careful reconstitution and storage to preserve biological activity in metabolic and mitochondrial research applications.

Product Name

MOTS-c(human) acetate

Peptide Sequence

H-Met-Arg-Trp-Gln-Gly-Met-Gly-Tyr-Ile-Phe-Thr-Pro-Arg-Lys-Leu-Arg-OH

Origin

Human mitochondria-derived peptide (MDP)

Salt Form

Acetate salt

Physical Form

Lyophilized powder

Storage Recommendation

Store at -20 °C or below, protected from light and moisture; avoid repeated freeze-thaw cycles

Application

Metabolic biology, mitochondrial research, cell-based assays, peptide pharmacology

Materials Required

Before beginning, ensure the following materials are available:

• MOTS-c(human) acetate lyophilized powder (SKU: M658801)
• Sterile, nuclease-free water or phosphate-buffered saline (PBS, pH 7.4) for aqueous reconstitution
• Sterile low-protein-binding microcentrifuge tubes (1.5 mL)
• Calibrated micropipettes and sterile tips
• Analytical balance (if gravimetric verification is required)
• Vortex mixer or gentle rotator
• Ice bucket or cooling block
• Aliquot storage tubes suitable for -80 °C
• Personal protective equipment (PPE): nitrile gloves, lab coat, eye protection

Reconstitution Procedure

Follow these steps to reconstitute MOTS-c(human) acetate for use in research assays:

1. Equilibrate to room temperature: Remove the vial from -20 °C storage and allow it to equilibrate to room temperature (approximately 15–25 °C) for 10–15 minutes before opening. This minimizes condensation inside the vial.
2. Centrifuge the vial: Briefly centrifuge the sealed vial (e.g., 5–10 seconds at low speed) to consolidate any lyophilized material that may have migrated to the cap or walls during shipping.
3. Prepare reconstitution solvent: For most applications, sterile water or PBS (pH 7.4) is recommended as the primary reconstitution solvent. If poor solubility is observed, add a small volume (e.g., ≤10% of total volume) of DMSO or dilute acetic acid as a co-solvent, then dilute to the final volume with aqueous buffer.
4. Add solvent slowly: Pipette the calculated volume of solvent slowly down the side of the vial (not directly onto the lyophilized cake) to achieve the desired stock concentration (typically 1–5 mg/mL). Avoid vigorous pipetting directly onto the peptide.
5. Mix gently: Gently vortex or roll the vial for 30–60 seconds until the peptide is completely dissolved. Do not sonicate, as this may cause peptide degradation.
6. Visually inspect: Confirm the solution is clear and free of visible particulates. If particulates remain, centrifuge gently at 1,000–2,000 × g for 2–3 minutes and collect the supernatant.
7. Aliquot and store: Divide the reconstituted stock solution into single-use aliquots in low-protein-binding tubes to avoid repeated freeze-thaw cycles. Store aliquots at -80 °C for long-term use or at 4 °C for short-term use (up to 1 week).

Storage and Stability Guidelines

Proper storage is critical to maintaining the biological activity and chemical integrity of MOTS-c(human) acetate:

• Lyophilized powder: Store at -20 °C or below, protected from light and moisture. Under these conditions, the lyophilized peptide is expected to be stable for an extended period (refer to the product Certificate of Analysis for the specific shelf life).
• Reconstituted solution: Working solutions should be stored at -80 °C for long-term stability. Avoid storing reconstituted peptide at 4 °C for more than 7 days, as peptide integrity may be compromised.
• Freeze-thaw cycles: Minimize freeze-thaw cycles to prevent aggregation and loss of activity. Prepare single-use aliquots at the time of reconstitution.
• Moisture and light: Peptides are hygroscopic; always reseal vials immediately after use with Parafilm or equivalent and return to -20 °C storage promptly.

Note: Specific stability data for this product should be confirmed against the Certificate of Analysis (CoA) provided with each lot.

Safety and Handling Precautions

Although MOTS-c(human) acetate is a research-grade peptide reagent and not classified as a hazardous chemical under standard laboratory regulations, standard laboratory safety practices must be observed:

• Wear appropriate PPE at all times: nitrile gloves, laboratory coat, and safety glasses.
• Handle the lyophilized powder in a well-ventilated area or under a laminar flow hood to avoid inhalation of fine particulate matter.
• This product is for research use only and is not intended for human or veterinary therapeutic use.
• Dispose of all waste materials (used vials, tips, tubes) in accordance with institutional and local regulatory guidelines.
• In the event of skin or eye contact, rinse immediately with copious amounts of water and seek medical attention if irritation persists.

Troubleshooting

Consult the table below if issues arise during reconstitution or assay use:

Problem	Possible Cause	Recommended Action
Peptide does not dissolve fully	Inappropriate solvent or insufficient mixing	Try adding a small volume of dilute acetic acid (0.1% in water) or DMSO as co-solvent; gently warm to 37 °C briefly; do not sonicate
Solution appears turbid or cloudy	Peptide aggregation or incompatible buffer	Centrifuge at 2,000 × g for 5 min; collect supernatant; consider changing buffer pH or ionic strength
Loss of activity observed in assay	Degradation from freeze-thaw or improper storage	Prepare fresh aliquots; confirm storage conditions; reduce freeze-thaw cycles; verify reconstitution solvent compatibility
Visible particulates after centrifugation	Peptide precipitation at working concentration	Reduce stock concentration; use fresh sterile solvent; filter through 0.22 µm low-protein-binding filter if required

Frequently asked questions

What is the recommended reconstitution solvent for MOTS-c(human) acetate?

Sterile water or phosphate-buffered saline (PBS, pH 7.4) is recommended for most research applications. If the peptide shows poor solubility, a small volume of DMSO or 0.1% acetic acid in water can be used as a co-solvent, followed by dilution with the aqueous buffer of choice.

How should MOTS-c(human) acetate be stored after reconstitution?

Reconstituted solutions should be aliquoted into single-use volumes and stored at -80 °C for long-term use. Short-term storage at 4 °C is acceptable for up to approximately one week. Repeated freeze-thaw cycles should be avoided to prevent peptide aggregation and loss of activity.

What is the amino acid sequence of MOTS-c(human) acetate?

The peptide sequence of MOTS-c(human) acetate is: H-Met-Arg-Trp-Gln-Gly-Met-Gly-Tyr-Ile-Phe-Thr-Pro-Arg-Lys-Leu-Arg-OH. This 16-amino-acid sequence is derived from the human mitochondrial 12S rRNA open reading frame.

Can MOTS-c(human) acetate be used for in vivo studies?

MOTS-c(human) acetate (SKU: M658801) is supplied as a research-grade reagent intended for laboratory research use only. It is not approved or validated for therapeutic, diagnostic, or clinical use. Researchers intending to use this peptide in animal studies should consult their institutional guidelines and confirm appropriate purity specifications with Aladdin Scientific prior to use.

What is MOTS-c and why is it studied?

MOTS-c is a mitochondria-derived peptide (MDP) encoded within the mitochondrial genome (12S rRNA). It has been studied for its roles in regulating metabolic homeostasis, insulin sensitivity, exercise physiology, and cellular stress responses. Research interest in MOTS-c has grown due to its potential relevance to aging, obesity, and metabolic disease, making it a valuable tool peptide for metabolic and mitochondrial biology research.

References

1. Lee C, Zeng J, Drew BG, et al. The mitochondrial-derived peptide MOTS-c promotes metabolic homeostasis and reduces obesity and insulin resistance. Cell Metabolism. 2015;21(3):443-454. doi:10.1016/j.cmet.2015.02.009
2. Kim SJ, Mehta HH, Wan J, et al. Mitochondrial peptides modulate mitochondrial function during cellular senescence. Aging (Albany NY). 2018;10(6):1239-1256.
3. Aladdin Scientific. Product Information: MOTS-c(human) acetate, SKU M658801. Aladdin Scientific Inc.

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