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The crystal structure of human α2-macroglobulin reveals a unique molecular cage.
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Abstract
I'm your Venus: the crystal structure of the human methylamine-induced form of α(2)-macroglobulin (α(2)M) shows its large central cavity can accommodate two medium-sized proteinases. Twelve major entrances provide access for small substrates to the cavity and the still-active trapped "prey". The structure unveils the molecular basis of the unique "venus flytrap" mechanism of α(2)M.