Download MendeleyStructure ofPseudomonas aeruginosaribosomes from an aminoglycoside-resistant clinical isolate.
Halfon, Y., Jimenez-Fernandez, A., La Rosa, R., Espinosa Portero, R., Krogh Johansen, H., Matzov, D., Eyal, Z., Bashan, A., Zimmerman, E., Belousoff, M., Molin, S., Yonath, A.(2019) Proc Natl Acad Sci U S A 116: 22275-22281
- PubMed: 31611393
- DOI: https://doi.org/10.1073/pnas.1909831116
- Primary Citation of Related Structures:
6SPB, 6SPC, 6SPD, 6SPE, 6SPF, 6SPG - PubMed Abstract:
Resistance to antibiotics has become a major threat to modern medicine. The ribosome plays a fundamental role in cell vitality by the translation of the genetic code into proteins; hence, it is a major target for clinically useful antibiotics. We report here the cryo-electron microscopy structures of the ribosome of a pathogenic aminoglycoside (AG)-resistant Pseudomonas aeruginosa strain, as well as of a nonresistance strain isolated from a cystic fibrosis patient. The structural studies disclosed defective ribosome complex formation due to a conformational change of rRNA helix H69, an essential intersubunit bridge, and a secondary binding site of the AGs. In addition, a stable conformation of nucleotides A1486 and A1487, pointing into helix h44, is created compared to a non-AG-bound ribosome. We suggest that altering the conformations of ribosomal protein uL6 and rRNA helix H69, which interact with initiation-factor IF2, interferes with proper protein synthesis initiation.
Organizational Affiliation:
Department of Structural Biology, The Weizmann Institute of Science, 7610001 Rehovot, Israel.
