MOTS-c vs SS-31: dva različita pristupa mitohondrijskoj biologiji

September 19, 2026

Futuristički prikaz usporednih mitohondrijskih signalnih putova

MOTS-c and SS-31 often end up in the same broad category of mitochondrial research, but they represent two very different experimental approaches.

MOTS-c: a mitochondrially encoded signalling peptide

MOTS-c is a 16-amino-acid peptide encoded within the mitochondrial 12S rRNA region. The literature links it to retrograde signalling to the nucleus and regulation of responses to metabolic and cellular stress, including AMPK-related pathways.

PubMed review of MOTS-c mechanisms

SS-31: targeting the inner mitochondrial membrane

SS-31, also known as elamipretide in clinical development, is a synthetic tetrapeptide studied for its interaction with cardiolipin and the inner mitochondrial membrane. Mechanistic work describes binding to lipid membranes and changes related to bioenergetics and oxidative phosphorylation.

PubMed: SS-31 and mitochondrial membranes

Key difference

	MOTS-c	SS-31
Origin / type	Mitochondrially encoded peptide	Synthetic mitochondria-targeted tetrapeptide
Main research focus	Stress signalling, metabolism, AMPK and nuclear response	Cardiolipin, inner membrane, oxidative phosphorylation
Experimental logic	Signal between mitochondria and the rest of the cell	More direct membrane and bioenergetic context

Why they are useful as comparative models

Both compounds fall under mitochondrial biology but target different layers of the same topic. Comparing their mechanisms therefore helps clarify the difference between mitochondrial signalling and more direct membrane/bioenergetic action.