Same atoms, different shape, opposite result. Only the roomier δ-form of hexachlorocyclohexane carries chloride across a membrane; its crowded β-twin can't. Shape, not how tightly it grips the ion, controls transport. New in JACS Au:
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How a molecule's shape decides whether it can ferry chloride across a membrane
Cells depend on moving ions like chloride across their membranes, and small molecules that can ferry ions across are sought after as possible treatments for diseases such as cystic fibrosis. We compar...