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A conformational flexibility scale for amino acids in peptides.

We now report a novel scale for the flexibility of amino acids, which provides an absolute measure for the time scale of conformational changes in short structureless peptides as a function of the amino acid type. This experimental scale is derived from kinetic measurements of the collision frequency between the two ends of short random-coil polypeptides. The present experiments provide the first application of our recently introduced fluorazophore method for measuring the kinetics of end-to-end collision in polypeptides. [16, 17] In