A ProtonT1,T2, and NOE Study of Relative Motion of the Indole Ring of Tryptophans in Gramicidin Analogs Incorporated into SDS Micelles

The proton spin–lattice relaxation time, spin–spin relaxation time, and NOE of the indole ring NH proton of tryptophan residues have been determined for seven analogs of gramicidin A incorporated into SDS micelles. The data obtained indicate that the motion of the indole rings systematically decreases, proceeding from the aqueous interface to the interior of the micelle.