MOTS-c is a 16-amino-acid mitochondrial-derived peptide (MDP) encoded within the mitochondrial 12S ribosomal RNA (rRNA) region — an unusual origin for a signaling peptide, since most peptides are encoded by the nuclear genome. This distinctive source shapes both how it is described and how it is reproduced for research.
Encoded in the mitochondrial genome
A short open reading frame embedded within the 12S rRNA gene gives rise to the 16-residue sequence associated with the metabolic signaling described in its mechanism of action. The concept of a defined, coded sequence is covered generally in understanding amino acid sequences.
A compact 16-residue peptide
At sixteen residues, MOTS-c is short enough to be reproduced faithfully by chemical synthesis yet long enough to fold into a defined conformation. Its small size is one reason it is tractable as a laboratory tool compared with larger proteins.
Made synthetically
For research, MOTS-c is produced by solid-phase peptide synthesis matching that 16-residue sequence, assembling the chain residue by residue on a resin support before cleavage and deprotection. The purified product is then lyophilized to a stable dry powder — see what is lyophilization.
Confirming identity
Because a synthetic peptide must match its natural template exactly, identity and purity are documented by HPLC purity analysis and mass spectrometry, verifying both sequence length and mass. The distinction between these methods is explained in HPLC vs. mass spectrometry.
Handling context
As a lyophilized research peptide, MOTS-c is stored dry and reconstituted only for controlled study. A broader introduction is available in the MOTS-c research overview.
Sequence fidelity and analytical mass
A single deletion, truncation, or side reaction can produce an impurity close in size to the intended peptide. Mass spectrometry tests whether the dominant product has the expected molecular mass, while chromatographic separation estimates the abundance of related species. Neither method alone proves every structural detail, so interpreting both together provides a stronger identity record for a synthetic 16-residue chain.
Native origin versus synthetic material
Chemically synthesized MOTS-c matches the reported amino-acid order but is not produced inside a mitochondrion. Research descriptions should distinguish sequence equivalence from biological origin and should document terminal state and counterions where available. This distinction helps prevent conclusions about endogenous processing, localization, or post-translational context from being inferred solely from experiments with a purified synthetic peptide.
Product page: MOTS-c research vials.
Research Use Only. Supplied strictly for laboratory research and development — not for human or veterinary use, consumption, or any therapeutic or diagnostic purpose. This article is research education, not usage guidance.