Preparation and properties of derivatives of the antibiotic A-128-OP at the β-methyltryptophan and dehydrotryptophan residuesстатья
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Дата последнего поиска статьи во внешних источниках: 19 сентября 2015 г.
Аннотация:Derivatives of the polypeptide antibiotic A-128-OP at positions 1, 2, and 3 of the indole rings of the β-methyltryptophan and dehydrotryptophan residues have been obtained for the first time, and their physicochemical properties have been studied. 2. The introduction into the antibiotic molecule of a 2-hydroxy-5-nitrobenzyl or a 2-nitrophenyl-sulfenyl substituent lower its antibacterial activity 15- to 20-fold. The replacement of the hydrogen atoms in positions 1 of the indole rings of the β-methyltryptophan and dehydrotryptophan residues leads to a 4-to 5-fold decrease in the activity of antibiotic A-128-OP.