Funding Organization(s): National Institutes of Health/National Institute of General Medical Sciences; National Institutes of Health/National Institute Of Allergy and Infectious Diseases; National Institutes of Health/National Cancer Institute; Human Frontiers in Science Program; National Science Foundation (United States); Department of Energy (United States)
Dynamic remodelling of intersubunit bridge B2, a conserved RNA domain of the bacterial ribosome connecting helices 44 (h44) and 69 (H69) of the small and large subunit, respectively, impacts translation by controlling intersubunit rotation. Here we s ...
Dynamic remodelling of intersubunit bridge B2, a conserved RNA domain of the bacterial ribosome connecting helices 44 (h44) and 69 (H69) of the small and large subunit, respectively, impacts translation by controlling intersubunit rotation. Here we show that aminoglycosides chemically related to neomycin-paromomycin, ribostamycin and neamine-each bind to sites within h44 and H69 to perturb bridge B2 and affect subunit rotation. Neomycin and paromomycin, which only differ by their ring-I 6'-polar group, drive subunit rotation in opposite directions. This suggests that their distinct actions hinge on the 6'-substituent and the drug's net positive charge. By solving the crystal structure of the paromomycin-ribosome complex, we observe specific contacts between the apical tip of H69 and the 6'-hydroxyl on paromomycin from within the drug's canonical h44-binding site. These results indicate that aminoglycoside actions must be framed in the context of bridge B2 and their regulation of subunit rotation.
Organizational Affiliation:
1] Department of Molecular and Cell Biology, University of California at Berkeley, Berkeley, California 94720, USA [2] Department of Chemistry, University of California at Berkeley, Berkeley, California 94720, USA.,Tri-Institutional Training Program in Chemical Biology, Weill Cornell Medical College, Rockefeller University, Memorial Sloan-Kettering Cancer Center, New York, New York 10065, USA.,Department of Physiology and Biophysics, Weill Cornell Medical College, New York, New York 10065, USA.,1] Department of Physiology and Biophysics, Weill Cornell Medical College, New York, New York 10065, USA [2] Tri-Institutional Training Program in Chemical Biology, Weill Cornell Medical College, Rockefeller University, Memorial Sloan-Kettering Cancer Center, New York, New York 10065, USA.,Department of Pharmaceutical Sciences, University of Kentucky College of Pharmacy, Lexington, Kentucky 40536, USA.
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