The chemical nature of the Dragendorff-positive substance produced by Streptomyces albulus was investigated. The substance was found to be a homopolymer of l-lysine connected with 25 ~ 30 residues in an isopeptide linkage. The ∊-poly-l-lysine is a unique natural substance not described before now.
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Shima et al. (1981) studied this question.
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