Abiotic vs Enzymatic PLOOH Regioselectivity as Chemical Fossil of Antioxidant Evolution

Ferroptosis is a form of programmed cell death where iron-driven chemical reactions destroy the fatty membranes of cells. It's a hot area in cancer and neuroscience research because understanding it could unlock new therapies. Separately, serpentinization is a geological process where iron-rich rocks react with water, generating reactive chemicals — a process that has been occurring since early Earth and is even studied as a possible cradle for life. This hypothesis builds a bridge between those two worlds. The key idea is about *precision*. When a cell's own enzyme (called 15-lipoxygenase) attacks a fat molecule, it does so with remarkable specificity — hitting one particular spot on the molecule more than 90% of the time. But when raw iron chemistry does the same job — the kind of chaotic, undirected chemistry that would have occurred in ancient iron-rich oceans and hydrothermal vents — it attacks more or less randomly across six possible sites, landing on any given spot only about 15–25% of the time. That's the difference between a surgeon's scalpel and a sledgehammer. The hypothesis argues that this contrast in chemical precision is essentially a 'fossil' — a preserved signature of evolutionary history. The idea is that life evolved sophisticated antioxidant enzymes precisely *because* the undirected iron chemistry was so indiscriminate and destructive. A specific, measurable experiment is proposed: expose fat molecules to iron-water chemistry in a test tube, then compare the pattern of damage to what an enzyme produces. If the predictions hold, the chemical fingerprint of abiotic chaos versus biological order becomes a traceable record of one of evolution's earliest arms races.

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