Abstract
The structures and conformational peculiarities of five members of the callatostatin family of neuropeptides, i.e. Leu- and Met-callatostatins, ranging in size from 8 to 16 amino acid residues have been investigated by a theoretical conformational analysis method. A comparative analysis of the conformational flexibilities of Met-callatostatin with those of the hydroxylated analogues, [Hyp2]- and [Hyp3]-Met-callatostatin has been carried out. Helically packed C-terminal pentapeptide in the structure of all investigated Leu-callatostatins are shown to be possible. The reason for the great number low-energy conformers for the callatostatin N-terminus is discussed.
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