The presence of a number of minor components was demonstrated in commercial samples of neomycin by column chromatography on a weakly acidic ionexchange resin (Amberlite CG-50). Some of these components were isolated by ionexclusion chromatography and identified. The identification was based on chromatographic and nmr data and on mass spectrometry of volatile derivatives. The sequence of elution...

The aminoglycosides paromomycin and neomycin were examined in Escherichia coli cells for an inhibitory effect on 30S ribosomal subunit assembly. Both compounds inhibited the growth rate, viable cell number, and protein synthesis rate with similar 50% inhibitory concentrations. Each drug also showed a concentration-dependent inhibition of 30S subunit formation. The inhibitory effect on 30S parti...

background: pentavalent antimonials are still the first choice treatment for leishmaniasis, but with low efficacy and resistance is emerging. in the present study, the effect of meglumine antimoniate (ma, glucantime) combined with paromomy-cin, miltefosine or allopurinol on in vitro susceptibility of leishmania tropica resistant isolate was evaluated. method : the drugs were obtained from comme...

Crystal structures of the 30S ribosomal subunit in complex with messenger RNA and cognate transfer RNA in the A site, both in the presence and absence of the antibiotic paromomycin, have been solved at between 3.1 and 3.3 angstroms resolution. Cognate transfer RNA (tRNA) binding induces global domain movements of the 30S subunit and changes in the conformation of the universally conserved and e...

The causative species of cutaneous leishmaniasis determines the clinical features and courses, and treatments. Intralesional or systemic antimonials are the gold standard for the treatment of these diseases. However, as for visceral leishmaniasis, other therapeutic options appear promising. Paromomycin ointments are effective in Leishmania major, L. tropica, L. mexicana, and L. panamensis lesio...

Combination therapy for the treatment of visceral leishmaniasis has increasingly been advocated as a way to increase treatment efficacy and tolerance, to reduce treatment duration and cost, and to limit the emergence of drug resistance. In the present work, we have adopted a rational approach, which can modulate the immune response to overcome the negative control systems and to boost the posit...

In an attempt to clone the ORF of the nptII gene of Escherichia coli K12 (ATCC 10798), two degenerate primers were designed based on the nptII sequence of its Tn5 transposon. The nptII ORF was placed under the control of the E. coli hybrid trc promoter, in the pKK388-1 vector, transformed into E. coli DH5α ΔrecA (recombinant, deficient strain). Transferred cells were tested for ampicillin, tetr...