Streptomycin is an aminoglycoside antibiotic, found as a metabolic product of Streptomyces
It is bactericidal in action, and was the first antibiotic used in the treatment of TB (tuberculosis), but it is no longer used for this purpose due to bacterial resistance.
It inhibits protein synthesis
by combining irreversibly with one subunit of the bacterial ribosomes.
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Streptomycin consists of three ring-shaped components - basically sugars with several amino groups - joined with standard glycosidic links: