MOTS-c and SS-31 Mitochondrial Peptides: Emerging Longevity-Pathway Research

TL;DR. MOTS-c is a 16-residue mitochondrial-encoded peptide that regulates metabolic homeostasis through AMPK activation. SS-31 (elamipretide) is a synthetic 4-residue tetrapeptide that binds cardiolipin on the inner mitochondrial membrane and preserves cristae architecture under oxidative stress. Both are active 2026 targets in longevity, cardiometabolic, and neurodegeneration research.

Mechanism at a glance

MOTS-c

• Encoded by the mitochondrial 12S rRNA gene (small ORF)
• Translocates to the nucleus under metabolic stress
• Activates AMPK, promotes glucose disposal, GLUT4 translocation
• In published rodent models: improves insulin sensitivity, reduces adipose accumulation on high-fat diet

SS-31 (Elamipretide)

• Binds cardiolipin on the inner mitochondrial membrane
• Preserves cristae architecture and ATP synthase supercomplexes
• Reduces mitochondrial ROS generation
• In published models: cardioprotection in ischemia-reperfusion, neuroprotection in Parkinson's-analogue models

Published research contexts (2024-2026)

Both peptides are in early- to mid-stage translational research pipelines. Institutional buyers should stock both when the research programme touches mitochondrial biology.

Storage and stability

• MOTS-c: lyophilised powder, 24-month shelf life at -20 °C; reconstituted 30 days at 2-8 °C. Standard reconstitution: 1-2 mL bacteriostatic water per mg.
• SS-31: lyophilised, 24-month shelf life at -20 °C; extremely water-soluble. Standard reconstitution: 1-2 mL sterile water or saline.

CoA and analytical considerations

Both peptides are relatively new to institutional research supply chains. Verify:

• HPLC ≥ 99%, both are small enough that impurity peaks resolve cleanly
• MS identity, MOTS-c theoretical mass ~2,174 Da; SS-31 ~640 Da (small, MALDI-TOF preferred)
• Solubility profile, should be documented on the CoA (MOTS-c is moderately soluble; SS-31 is highly water-soluble)

Bulk sourcing

Manufacturing capacity for both peptides is smaller than the GLP-1 or BPC-157 families. For institutional volumes:

• Confirm 12-24 month supply-contract availability before committing
• Verify third-party CoA (some vendors sell in-house CoAs only for these newer compounds)
• Ask for reference institutions currently buying at your target volume

Working with Penlab Peptide

Penlab supplies MOTS-c and SS-31 in research-grade lyophilised format with batch-level CoAs. For longevity-research programmes ordering above €50,000/month, contact the bulk procurement portal or sales@penlabpeptide.com.

Products are sold strictly for in-vitro laboratory research by KYC-verified institutional buyers.