MOTS-c reconstitution protocol

This protocol describes the reconstitution and storage of lyophilized MOTS-c (Mitochondrial Open Reading Frame of the Twelve S rRNA-c) in standard research workflows. MOTS-c is a 16-amino-acid compound encoded within mitochondrial DNA — it's the first member of a class called "mitochondrial-derived compounds" and is studied for its role in metabolic regulation, insulin sensitivity, and exercise response. Values below reflect published handling literature; study design is the responsibility of the qualified investigator.

At a glance

Parameter	Value
Recommended diluent	Bacteriostatic Water (USP, 0.9% benzyl alcohol)
Recommended volume (20 mg vial)	2.0 mL
Final concentration	10 mg/mL
Stability — lyophilized	≥24 months at -20 °C, light-protected, sealed
Stability — reconstituted	30 days at 2–8 °C in original vial
Freeze-thaw	Avoid on reconstituted solution. Aliquot for longer storage.

Procedure

1. Equilibrate the vial to room temperature.
2. Sterile prep: wipe stopper with isopropyl. Use sterile syringe and needle.
3. Inject diluent slowly along the inner wall.
4. Swirl gently. Do not shake. Cake dissolves within 30–60 seconds.
5. Verify: solution should be clear and colorless.

Compound notes

MOTS-c (MFRLRELLKKLPAAEEK) is one of a small number of compounds encoded by mitochondrial DNA rather than the nuclear genome. The compound is exported from mitochondria into the cytoplasm and circulation, where it acts as a signaling molecule — most prominently activating AMPK in skeletal muscle and modulating folate-cycle metabolism. Plasma levels are known to decline with age in humans, which is the basis for much of the aging-research interest.

The compound is relatively well-behaved in solution: tolerant of standard buffers, no unusual sensitivity to ionic strength or pH within physiological range. Plasma half-life is short (~1–2 hours in rodent models), so research protocols typically use daily or every-other-day administration.

Storage

Reconstituted MOTS-c is stable for approximately 30 days at 2–8 °C. For longer storage, aliquot into sterile single-use tubes and freeze at -20 °C or colder. Lyophilized stability is ≥24 months at -20 °C light-protected.

Notes

This protocol describes reconstitution parameters from published handling literature. It is not a recommendation for any specific research protocol or design. For research use only. Not for human or veterinary use.

References

1. Lee C, Zeng J, Drew BG, et al. The mitochondrial-derived compound MOTS-c promotes metabolic homeostasis and reduces obesity and insulin resistance. Cell Metab 2015;21:443–454. PMID: 25738459
2. Kim SJ, Miller B, Mehta HH, et al. The mitochondrial-derived compound MOTS-c is a regulator of plasma metabolites and enhances insulin sensitivity. Physiol Rep 2019;7:e14171. PMID: 31293078