Abstract
The prokaryotic ribosome is an important target of antibiotic action. We determined the X-ray structure of the aminoglycoside kasugamycin (Ksg) in complex with the Escherichia coli 70S ribosome at 3.5-Å resolution. The structure reveals that the drug binds within the messenger RNA channel of the 30S subunit between the universally conserved G926 and A794 nucleotides in 16S ribosomal RNA, which are sites of Ksg resistance. To our surprise, Ksg resistance mutations do not inhibit binding of the drug to the ribosome. The present structural and biochemical results indicate that inhibition by Ksg and Ksg resistance are closely linked to the structure of the mRNA at the junction of the peptidyl-tRNA and exit-tRNA sites (P and E sites).
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Acknowledgements
We thank K. Frankel, G. Hura and J. Holton for help with data measurements at the SIBYLS beamline at the Advanced Light Source. A.V.-S. would like to acknowledge I. Tinoco for valuable discussions, C.M. Brown for help with Transterm and F. Vila for balance and coherence. This work was funded by the US National Institutes of Health (GM65050 to J.H.D.C., GM065120 to G.R.J, GM19756 to A.E.D. and National Cancer Institute grant CA92584 for the SIBYLS and 8.3.1 beamlines) and by the US Department of Energy (DE-AC03-76SF00098, KP110201 and LBNL LDRD 366851 to J.H.D.C. and DE-AC03 76SF00098 for the SIBYLS and 8.3.1 beamlines).
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Supplementary information
Supplementary Fig. 1
Binding of Ksg to the ribosome. (PDF 702 kb)
Supplementary Fig. 2
Total relative activities of NUG mRNA constructs. (PDF 724 kb)
Supplementary Table 1
Data collection and refinement statistics. (PDF 71 kb)
Supplementary Table 2
Quantification of Ksg footprints. (PDF 61 kb)
Supplementary Table 3
Quantification of toeprints. (PDF 68 kb)
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Schuwirth, B., Day, J., Hau, C. et al. Structural analysis of kasugamycin inhibition of translation. Nat Struct Mol Biol 13, 879–886 (2006). https://doi.org/10.1038/nsmb1150
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DOI: https://doi.org/10.1038/nsmb1150
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