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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Binding of Neomycin-Class Aminoglycoside Antibiotics to Mutant Ribosomes with Alterations in the A Site of 16S rRNA.

Aminoglycoside antibiotics that bind to the aminoacyl-tRNA site (A site) of the ribosome are composed of a common neamine core in which a glycopyranosyl ring is attached to position 4 of a 2-deoxystreptamine moiety. The core is further substituted by one (ribostamycin), two (neomycin and paromomycin), or three (lividomycin A) additional sugars attached to position 5 of the 2-deoxystreptamine. To study the role of rings III, IV, and V in aminoglycoside binding, we used isogenic Mycobacterium smegmatis DeltarrnB mutants carrying homogeneous populations of mutant ribosomes with alterations in the 16S rRNA A site. MICs were determined to investigate drug-ribosome interactions, and the results were compared with that of the previously published crystal structure of paromomycin bound to the ribosomal A site. Our analysis demonstrates that the stacking interaction between ring I and G1491 is largely sequence independent, that rings III and IV each increase the strength of drug binding to the ribosome, that ring IV of the 6'-NH(3)(+) aminoglycosides compensates for loss of interactions between ring II and U1495 and between ring III and G1491, that the aminoglycosides rely on pseudo-base pairing between ring I and A1408 for binding independently of the number of sugar rings attached to the neamine core, that addition of ring V to the 6'-OH 4,5-aminoglycoside paromomycin does not alter the mode of binding, and that alteration of the U1406 . U1495 wobble base pair to the Watson-Crick interaction pair 1406C-1495G yields ribosomal drug susceptibilities to 4,5-aminoglycosides comparable to those seen with the wild-type A site.[1]


  1. Binding of Neomycin-Class Aminoglycoside Antibiotics to Mutant Ribosomes with Alterations in the A Site of 16S rRNA. Hobbie, S.N., Pfister, P., Bruell, C., Sander, P., François, B., Westhof, E., Böttger, E.C. Antimicrob. Agents Chemother. (2006) [Pubmed]
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