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The AcrAB efflux system of Erwinia amylovora is important for this organism's virulence, plant (host) colonization, and resistance to plant toxins. [14] The MexXY component of the MexXY-OprM multidrug efflux system of P. aeruginosa is inducible by antibiotics that target ribosomes via the PA5471 gene product. [15]
Iboxamycin is a synthetic lincosamide or oxepanoprolinamide antibiotic.It binds to the bacterial ribosome in both Gram-negative and Gram-positive bacteria and it has been found to effective against bacteria which are resistant to other antibiotics that target the large ribosomal subunit.
Thus, it binds to the ribosomal A site and participates in peptide bond formation, producing peptidyl-puromycin. However, it does not engage in translocation and quickly dissociates from the ribosome, causing a premature termination of polypeptide synthesis. Streptogramins also cause premature release of the peptide chain. [17]
Twelve classes of ribosomal protection genes/proteins have been found. [35] Possible mechanisms of action of these protective proteins include: blocking tetracyclines from binding to the ribosome [36] binding to the ribosome and distorting the structure to still allow t-RNA binding while tetracycline is bound [37]
The incidence of inner ear toxicity varies from 7 to 90%, depending on the types of antibiotics used, susceptibility of the patient to such antibiotics, and the duration of antibiotic administration. [20] Another serious and disabling side effect of aminoglycoside use is vestibular ototoxicity. [19]
Most target bacterial functions or growth processes. [8] Those that target the bacterial cell wall (penicillins and cephalosporins) or the cell membrane , or interfere with essential bacterial enzymes (rifamycins, lipiarmycins, quinolones, and sulfonamides) have bactericidal activities, killing the bacteria.
The 30S subunit is the target of antibiotics such as tetracycline and gentamicin. [11] These antibiotics specifically target the prokaryotic ribosomes, hence their usefulness in treating bacterial infections in eukaryotes. Tetracycline interacts with H27 in the small subunit as well as binding to the A-site in the large subunit. [11]
As human and bacteria both have ribosomes, streptomycin has significant side effects in humans. At low concentrations, however, streptomycin inhibits only bacterial growth. [18] Streptomycin is an antibiotic that inhibits both Gram-positive and Gram-negative bacteria, [19] and is therefore a useful broad-spectrum antibiotic.