Andreas Schedlbauer / Idoia Iturrioz / Borja Ochoa-Lizarralde / Tammo Diercks / Jorge Pedro López-Alonso / José Luis Lavin / Tatsuya Kaminishi / Retina Çapuni / Neha Dhimole / Elisa de Astigarraga / David Gil-Carton / Paola Fucini / Sean R Connell /
PubMed 要旨
While a structural description of the molecular mechanisms guiding ribosome assembly in eukaryotic systems is emerging, bacteria use an unrelated core set of assembly factors for which high- ...While a structural description of the molecular mechanisms guiding ribosome assembly in eukaryotic systems is emerging, bacteria use an unrelated core set of assembly factors for which high-resolution structural information is still missing. To address this, we used single-particle cryo-electron microscopy to visualize the effects of bacterial ribosome assembly factors RimP, RbfA, RsmA, and RsgA on the conformational landscape of the 30 ribosomal subunit and obtained eight snapshots representing late steps in the folding of the decoding center. Analysis of these structures identifies a conserved secondary structure switch in the 16 ribosomal RNA central to decoding site maturation and suggests both a sequential order of action and molecular mechanisms for the assembly factors in coordinating and controlling this switch. Structural and mechanistic parallels between bacterial and eukaryotic systems indicate common folding features inherent to all ribosomes.
EMDB-11769, PDB-7afl: Bacterial 30S ribosomal subunit assembly complex state D (multibody refinement for body domain of 30S ribosome) 手法: EM (単粒子) / 解像度: 4.2 Å
EMDB-12244, PDB-7boi: Bacterial 30S ribosomal subunit assembly complex state F (multibody refinement for body domain of 30S ribosome) 手法: EM (単粒子) / 解像度: 2.98 Å
EMDB-12246, PDB-7nas: Bacterial 30S ribosomal subunit assembly complex state A (multibody refinement for body domain of 30S ribosome) 手法: EM (単粒子) / 解像度: 3.31 Å