title: Ribosome-binding activities and antimicrobial activities of tylosin and its related compounds.
abstract: Structure-activity relationships of tylosin and related compounds were evaluated in terms of their antimicrobial and ribosome-binding activities. Demycarosyl derivatives, demycarosyltylosin and 20-deoxydemycarosylrelomycin, were slightly weaker than tylosin and 20-deoxyrelomycin, respectively, both in antimicrobial activity and in affinity to ribosomes. The corresponding demycarosyl-demycinosyl derivatives had weaker antimicrobial activities despite their relatively high affinities to ribosomes. A 23-deoxy-demycarosyl-demycinosyl derivative, 20-oxo-5-O-mycaminosylprotylonolide, had a higher affinity to ribosomes than that of tylosin and was equivalent to tylosin in antimicrobial activity against Gram-positive bacteria. These results suggest that the mycinose moiety increases the ability of the molecule to enter bacterial cells. Among the derivatives tested, a 23-iodo derivative, 20-deoxy-23-iodo-5-O-mycarosyltylonolide, had the highest affinity for ribosomes as well as the highest antimicrobial activity.
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D007933:Leucomycins / Q000494:pharmacology*; D008826:Microbial Sensitivity Tests; D012270:Ribosomes / Q000187:drug effects / Q000378:metabolism*; D013329:Structure-Activity Relationship; D015645:Tylosin
chemical_list: D000900:Anti-Bacterial Agents; D007933:Leucomycins; D015645:Tylosin