Funding Organization(s): National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID), National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS), Simons Foundation, National Institutes of Health/National Center for Advancing Translational Sciences (NIH/NCATS)
Primary Citation of Related Structures: 9B4Z, 9B50, 9B51
PubMed Abstract:
Aminoglycosides disrupt the fidelity of bacterial protein synthesis, but their potent antibacterial activity is threatened by multiple resistance mechanisms, including methylation of their ribosomal RNA (rRNA) binding site. However, the impact of one such resistance-conferring methylation on N1 of helix 44 nucleotide A1408 (m 1 A1408) is highly variable with some aminoglycosides retaining significant potency. Here, we examine bacterial susceptibility to diverse aminoglycosides, determine high-resolution electron cryomicroscopy structures of m 1 A1408-modified 70S ribosome-aminoglycoside complexes, and perform molecular dynamics simulations to decipher the key determinants of such "resistance evasion." Collectively, these analyses reveal how some aminoglycosides adapt their conformation to accommodate m 1 A1408, including the roles of specific ring substituents, balancing ligand strain and maintaining favorable interactions, as well as interactions made by additional functional groups that compensate for those disrupted by the modification. This work provides design principles that can guide future rational development of aminoglycosides refractory to resistance conferred by rRNA modifications.
Organizational Affiliation:
Department of Biochemistry, Emory University School of Medicine, Atlanta, GA, USA.
Department of Chemistry, Emory University, Atlanta, GA, USA.
Graduate Program in Biochemistry, Cell, and Developmental Biology (BCDB), Emory University, Atlanta, GA, USA.
Department of Chemistry, Emory University, Atlanta, GA, USA. cmdunha@emory.edu.
Emory Antibiotic Resistance Center (ARC), Emory University, Atlanta, Georgia, USA. cmdunha@emory.edu.
Department of Biochemistry, Emory University School of Medicine, Atlanta, GA, USA. gconn@emory.edu.
Emory Antibiotic Resistance Center (ARC), Emory University, Atlanta, Georgia, USA. gconn@emory.edu.
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