FDX1 Redox Potential Tuned to Vent Cu2+/Cu+ Boundary

Cuproptosis is a recently discovered way that cells can die — not from the usual suspects like toxins or immune attack, but from too much copper overwhelming a specific protein inside the cell. That protein, called FDX1, normally helps manage chemical reactions involving electrons. When copper floods in, FDX1 gets involved in a cascade that causes other proteins to clump together catastrophically, killing the cell. Meanwhile, hydrothermal vents on the ocean floor are natural chemistry labs where copper minerals like chalcopyrite form under precise conditions of heat, pressure, and electrical chemistry — conditions that scientists map using something called a Pourbaix diagram, which is essentially a map showing where copper prefers to be in its oxidized (Cu2+) or reduced (Cu+) form. This hypothesis proposes something striking: that FDX1's electrochemical properties — specifically the voltage at which it swaps electrons — may have been evolutionarily tuned to match the copper chemistry found at ancient hydrothermal vents. In other words, life may have calibrated one of its key proteins to operate right at the chemical boundary where copper flips between its two states, a boundary that was physically defined by the geochemistry of early Earth's seafloor. If true, this would mean that a form of cell death relevant to cancer treatment today has its roots in the chemistry of billion-year-old ocean vents. It's a hypothesis that connects deep Earth geology to modern cell biology through the lens of evolution — suggesting that copper's role as a cellular killer wasn't accidental, but was baked in from the very environments where early life evolved.

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