SS-31 vs MOTS-c vs NAD+: Mitochondrial Research Compounds Compared
Mitochondria sit at the center of metabolism and aging research, and several research compounds target them from different directions. SS-31 acts on the mitochondrial membrane itself, MOTS-c is a signal the mitochondria send to the rest of the cell, and NAD+ is the coenzyme mitochondria run on. This guide explains how the three differ and where the NNMT inhibitor 5-Amino-1MQ fits in.
At a glance
| SS-31 | MOTS-c | NAD+ | |
|---|---|---|---|
| What it is | Synthetic tetrapeptide (elamipretide) | 16-amino-acid peptide encoded in mitochondrial DNA | Coenzyme (not a peptide) |
| Where it acts | Inner mitochondrial membrane | Signals from the mitochondria to the cytoplasm and nucleus | Throughout the cell; electron carrier and enzyme substrate |
| Key interaction | Binds cardiolipin | AMPK activation | Consumed by sirtuins, PARPs and CD38 |
| Main research areas | Bioenergetics, ROS production, cristae structure | Glucose uptake, metabolic flexibility, stress response | Sirtuin activity, DNA repair, energy metabolism |
SS-31: protecting the machinery
SS-31 is a short peptide (D-Arg-dimethylTyr-Lys-Phe-NH2) whose alternating aromatic and basic residues let it cross cell membranes and gather at the inner mitochondrial membrane. There it binds cardiolipin, a lipid the electron-transport chain needs to work efficiently. Research focuses on how this affects energy production, reactive oxygen species and the folded inner-membrane structures called cristae, especially in aging and cell-stress models. SS-31 research profile.
MOTS-c: a message from the mitochondria
Most proteins are encoded in the cell nucleus. MOTS-c is unusual: it is encoded in mitochondrial DNA, inside the 12S rRNA region. It belongs to a small group of mitochondrial-derived peptides that let mitochondria communicate with the rest of the cell. Research links it to AMPK activation, glucose uptake in muscle-cell models and metabolic flexibility, and it has been observed moving to the nucleus under metabolic stress. MOTS-c research profile.
NAD+: the fuel and the currency
NAD+ carries electrons through cellular respiration, and it is also used up by enzymes such as sirtuins (involved in gene regulation) and PARPs (involved in DNA repair). Because NAD+ levels fall in many aging models, how cells make, recycle and spend NAD+ is a major research topic. NAD+ research profile.
Where 5-Amino-1MQ fits
5-Amino-1MQ is a small molecule that inhibits nicotinamide N-methyltransferase (NNMT), an enzyme that uses up nicotinamide, one of the building blocks cells recycle into NAD+. Blocking NNMT is studied as a way to influence the NAD+ salvage pathway from the supply side, which makes it a natural companion to NAD+ in study designs.
How they combine in study designs
- Structure vs signaling: SS-31 (membrane integrity) alongside MOTS-c (metabolic signaling) separates direct mitochondrial protection from downstream signaling effects.
- Supply and demand of NAD+: NAD+ alongside 5-Amino-1MQ looks at the NAD+ pool from both directions.
- Senescence models: mitochondrial compounds are often paired with the senolytic peptide FOXO4-DRI or the antioxidant glutathione.
Handling notes
SS-31 and MOTS-c are stable as lyophilized powder at -20°C. NAD+ is more sensitive: keep it dry, cold and dark, and avoid leaving solutions at room temperature. Our storage guide has the details. Every lot we sell is tested by Bioviridian Labs (ISO/IEC 17025, Texas) for HPLC purity, mass-spectrometry identity, endotoxin and heavy metals; check any lot in the COA Library.
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For laboratory research use only. Not for human or veterinary use. This article summarizes published research for educational purposes and does not provide medical advice.