allosteric transition

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allosteric transition

[¦a·lə¦stir·ik tranz′ish·ən]
(biochemistry)
A reversible exchange of one base pair for another on a protein molecule that alters the properties of the active site and changes the biological activity of the protein.
References in classic literature ?
She "carried" the alto by ear, danced without being taught, played the melodeon without knowing the notes.
As regards one of these foibles, I should not even have mentioned it in this history but for the remarkable prominency - the extreme alto relievo - in which it jutted out from the plane of his general disposition.
In one sense, therefore, it is of greater value than any other institution for the training of men and women that we have, from Cambridge to Palo Alto.