Structure of rhodopsin and the superfamily of seven-helical receptors: the same and not the same.

The crystal structure of rhodopsin provides significant insights concerning structure/activity relationships in visual pigments and related G-protein-coupled receptors. The specific arrangement of seven-transmembrane helices is stabilized by a series of intermolecular interactions that appear to be conserved among Family A receptors. However, the potential for structural and functional diversity among members of the superfamily of seven-helical receptors presents a significant future challenge.

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