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A novel 20-residue fold, designated the `Trp-cage' motif, hasbeen shown to be 98+% folded in both water and 30 vol-%trifluoroethanol solution. Folding is cooperative andhydrophobically driven, resulting in the burial of the Trpsidechain and a stable H-bond from the Trp-εNH to a sequenceremote backbone carbonyl. In the present study the effects ofreplacing the Trp with His, Phe and both isomers of...
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