Abstract
Abstract CD spectral analysis of chromophoric derivatives of tetrapeptides related to the β-turn part of [d-Val1,1′]-and [d-Val1,1′, l-Phe4,4′]-gramicidin S indicated that they had very low preference for β-turn formation. The results suggested that neither analog could take gramicidin S-like β-sheet conformation. It seems noteworthy that the side-chain bulkiness of the 4th amino acid of a tetrapeptide affects the stability of β-turn.
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