The Vital Question

Imported from Google Keep on 2026-03-23.

Imported images from Keep

Unrolled from a shared ChatGPT conversation titled Alkaline Vent Metabolism.

According to Nick Lane, alkaline hydrothermal vents provided a natural proton gradient.
That gradient could drive early metabolism / help H2 and CO2 react.
Leaky membranes mattered because equilibrium was not simply allowed to settle.
Modern enzymes like ECH were taken as part of the picture.

According to Lane, life may have originated in alkaline hydrothermal vents because they provided:

A redox disequilibrium — abundant H2 from vents and CO2 from the ocean.
A natural proton gradient — alkaline vent fluid against relatively more acidic ocean water.
Catalytic mineral barriers — especially Fe(Ni)S-rich microporous walls.
Initially leaky compartments / membranes — so early systems could depend on an externally supplied gradient rather than generating and sealing their own from the start.

The claim is not just “proton gradients + catalysts = life.”
Proton gradients would have helped drive early protometabolism / carbon fixation, not by themselves magically produce full life.
The vent system is better thought of as an open-flow geochemical disequilibrium maintained by geology, not a one-shot battery.
“Leaky membranes” are useful in this picture because the gradient is continuously supplied by the vent environment.
Modern proteins such as energy-converting hydrogenase (Ech) are better treated as descendants / analogical clues than as literally present from the start.

H2 + CO2 provide the redox disequilibrium.
Natural proton gradients across vent barriers provide directional energetic bias.
Fe(Ni)S compartments act like catalytic, semi-cell-like structures.
Early systems were probably proton-leaky, which only works because geology kept supplying the gradient.
The model is about the origin of protometabolism first, with heredity, tighter membranes, and full cellular machinery coming later.