Subtilin, a 32-amino acid peptide with potent antimicrobial activity, has been isolated from Bacillus subtilis ATCC6633. The chemical structure has been confirmed by the unambiguous sequence-specific assignment of its 1H NMR spectrum. Detailed NMR analysis revealed that subtilin is a rather flexible molecule; the only observed conformational contraints were those imposed by the cyclic structures created by the lanthionine and 3-methyllanthionine residues. These results suggest that in aqueous solution subtilin and the homologous peptide nisin have similar conformations.
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Chan et al. (1992) studied this question.
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