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“In particular, the substitution of Trp for the hydrophobic amino acids, Gln and Asp at positions 17 and 19 of HP (2-20) (Anal 3), caused a dramatic increase in antibiotic activity without a hemolytic effect.”
“Although L-tryptophan inhibited the actions of cholecystokinin, L-phenylalanine, L-methionine or L-aspartic acid , even when tested at concentrations as high as 3 mM, did not alter the action of cholecystokinin on pancreatic acini.”
“In the closed state, four tightly packed transmembrane helices define a narrow channel, in which a tryptophan gate’ is locked by intermolecular interactions with aspartic acid.”
“Charged and polar residues D , H, K, N, Q, R, S) are more incident in the immediate surrounding of tryptophan (-6, -5, -2, -1, 1, 2, 4) and hydrophobic residues (A, F, I, L, V, Y) are more rare than in remote positions.”