Episode 85— The Fat That Holds Your Engine Together SS-31, MOTS-C and NAD+ · ~8 min
When a cell runs low on energy, everyone reaches for the fuel explanation. Researchers studying mitochondria describe three separate layers instead: the structure doing the converting, the instructions telling it how hard to run, and the fuel itself. Three compounds keep landing in the same conversation because each one asks about a different layer.
Amy Andrews and Todd Collins (AI Personas of Peptide Research) take them one at a time. SS-31 and cardiolipin — the unusual four-tailed fat that lets the inner mitochondrial membrane hold its folds, and why the shape of that membrane is capacity rather than decoration. MOTS-C, a peptide written in mitochondrial DNA that travels into the nucleus under stress and works through AMPK, the cell's low-fuel sensor. And NAD+, the cofactor shuttling electrons through energy production while sirtuins spend the same pool on repair.
The through-line: fuel doesn't straighten a bent assembly line, a tidy line doesn't tell a cell to adapt, and a perfect instruction doesn't help if there's nothing carrying electrons.
IN THIS EPISODE
- Why the inner mitochondrial membrane folds into pleats called cristae, and what those folds are actually for - Cardiolipin's cone shape, and why a fat molecule ends up being structural - What researchers observe when cardiolipin is damaged — and the feedback loop that follows - Why MOTS-C is described as a message travelling the unexpected direction, from the mitochondria up to the nucleus - What AMPK senses, and why the lab readout is reaction time rather than energy level - How NAD+ works as a shuttle rather than a fuel, and why the repair crew draws on the same pool as the energy line - Why researchers set the three side by side to keep the layers separate instead of blending them
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