Abstract
Surugamides are a group of non-ribosomal peptides produced by Streptomyces spp. Several derivatives possess acyl groups, which are proposed to be attached to a lysine side chain after backbone-macrocyclization during biosynthesis. To date, five different acyl groups have been identified in nature, yet their impacts on biological activity remain underexplored. Here we synthesized surugamide B derivatives with varied acyl moieties. Biological evaluations revealed that larger hydrophobic acyl groups on lysine ε-NH2 enhance cytotoxicity.
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