Aminoglycosides | Source & Nomenclature
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- Опубликовано: 8 май 2024
- #Aminoglycosides #drnajeeb #drnajeeblectures #education #antibiotics #tobramycin #amicacin #gentamicin #nomenclature
Aminoglycosides | Source & Nomenclature
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▬▬▬▬▬▬▬▬▬▬ Contents of this video ▬▬▬▬▬▬▬▬▬▬
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Aminoglycoside is a medicinal and bacteriologic category of traditional Gram-negative antibacterial medications that inhibit protein synthesis and contain as a portion of the molecule an amino-modified glycoside (sugar). The term can also refer more generally to any organic molecule that contains amino sugar substructures. Aminoglycoside antibiotics display bactericidal activity against Gram-negative aerobes and some anaerobic bacilli where resistance has not yet arisen but generally not against Gram-positive and anaerobic Gram-negative bacteria.
Streptomycin is the first-in-class aminoglycoside antibiotic. It is derived from Streptomyces griseus and is the earliest modern agent used against tuberculosis. Streptomycin lacks the common 2-deoxystreptamine moiety (image right, below) present in most other members of this class. Other examples of aminoglycosides include the deoxystreptamine-containing agents kanamycin, tobramycin, gentamicin, and neomycin.
Nomenclature
Aminoglycosides that are derived from bacteria of the Streptomyces genus are named with the suffix -mycin, whereas those that are derived from Micromonospora are named with the suffix -micin. However, this nomenclature system is not specific for aminoglycosides, and so appearance of this set of suffixes does not imply common mechanism of action. (For instance, vancomycin, a glycopeptide antibiotic, and erythromycin, a macrolide antibiotic produced by Saccharopolyspora erythraea, along with its synthetic derivatives clarithromycin and azithromycin, all share the suffixes but have notably different mechanisms of action.)
In the following gallery, kanamycin A to netilmicin are examples of the 4,6-disubstituted deoxystreptamine sub-class of aminoglycosides, the neomycins are examples of the 4,5-disubstituted sub-class, and streptomycin is an example of a non-deoxystreptamine aminoglycoside.
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