Pre-50S ribosomal subunit intermediate (Pre-50S) (Pre-50S)

Pre-50S ribosomal subunit intermediates are transient ribonucleoprotein complexes formed during the hierarchical assembly of the bacterial large (50S) ribosomal subunit (Shajani et al., 2011, Annual Review of Biochemistry). This process involves the coordinated folding of 23S and 5S rRNAs and the sequential binding of approximately 33 ribosomal proteins, often facilitated by specialized assembly factors such as GTPases and RNA helicases (Davis & Williamson, 2017, Nature). These intermediates serve as critical checkpoints in ribosome biogenesis, ensuring that only correctly folded and processed subunits enter the translation cycle. In the context of pharmacology, several classes of antibiotics, including macrolides and pleuromutilins, have been shown to interfere with the late stages of 50S maturation, causing the accumulation of defective pre-50S particles (Champney, 2006, Current Drug Targets). Targeting these intermediates or their associated assembly factors represents a potent strategy for developing new antimicrobial agents, as it disrupts the production of the protein synthesis machinery itself (Dunkle et al., 2010, Science). Such disruption leads to a rapid decline in cellular translation capacity and eventual bacterial cell death. Furthermore, the structural differences between bacterial pre-50S intermediates and eukaryotic ribosome precursors provide a window for therapeutic selectivity.

Other names

Immature 50S ribosomal subunit50S assembly intermediatePre-50S particleLarge ribosomal subunit precursor

Inhibition of ribosomal subunit assembly and maturation, leading to the accumulation of non-functional precursor particles and depletion of active 70S ribosomes.