Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-4242
Hobbie, S N; Pfister, P; Bruell, C; Sander, P; François, B; Westhof, E; Böttger, E C (2006). Binding of neomycin-class aminoglycoside antibiotics to mutant ribosomes with alterations in the A site of 16S rRNA. Antimicrobial Agents and Chemotherapy, 50(4):1489-1496.
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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'-NH3+ 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.
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|Item Type:||Journal Article, refereed, original work|
|Communities & Collections:||04 Faculty of Medicine > Institute of Medical Microbiology|
|DDC:||570 Life sciences; biology
610 Medicine & health
|Deposited On:||26 Mar 2009 12:51|
|Last Modified:||27 Nov 2013 17:34|
|Publisher:||American Society for Microbiology|
|Additional Information:||Copyright: American Society for Microbiology|
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