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Related Concept Videos

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Aminoglycosides constitute a highly potent class of bactericidal antibiotics that exert their antimicrobial effects by targeting the bacterial ribosome, specifically disrupting protein synthesis. These polycationic molecules consist of amino-modified sugars linked via glycosidic bonds to an aminocyclitol core such as 2-deoxystreptamine or streptamine. Their strong positive charges facilitate tight binding to the negatively charged phosphate backbone of ribosomal RNA (rRNA), primarily at the 16S...
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Negamycin interferes with decoding and translocation by simultaneous interaction with rRNA and tRNA.

Yury S Polikanov1, Teresa Szal2, Fuyan Jiang3

  • 1Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, CT 06520, USA; Howard Hughes Medical Institute, Yale University, New Haven, CT 06520, USA.

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Negamycin (NEG) is a promising antibiotic targeting bacterial ribosomes. Its primary action site near helix 34 in the small subunit stabilizes tRNA binding, inhibiting translocation and causing errors.

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Area of Science:

  • Structural Biology
  • Microbiology
  • Antibiotic Resistance

Background:

  • Negamycin (NEG) is a clinically relevant ribosome-targeting antibiotic.
  • The precise binding site and mechanism of action for NEG were previously unknown.

Purpose of the Study:

  • To elucidate the structural basis of Negamycin's interaction with the bacterial ribosome.
  • To identify the primary binding site and understand the mode of action of NEG.

Main Methods:

  • Determined the cryo-EM structure of the Thermus thermophilus ribosome complexed with mRNA, tRNAs, and NEG.
  • Utilized resistance mutation data to pinpoint the antibiotic's primary interaction site.

Main Results:

  • Identified nine independent binding sites for NEG on both ribosomal subunits.
  • Located the primary site of action in the small subunit, near helix 34 (h34), interacting with 16S rRNA and A-site tRNA.
  • Observed that NEG stabilizes aminoacyl-tRNA binding, unlike tetracycline, leading to inhibited translocation and stimulated miscoding.

Conclusions:

  • The primary NEG binding site is in the small ribosomal subunit near h34, crucial for its antibacterial activity.
  • NEG's distinct mechanism of stabilizing tRNA binding differentiates it from other ribosome inhibitors like tetracycline.
  • Understanding NEG's structural interactions provides insights into novel antibiotic development strategies.