Bacterial 50S ribosomal subunit assembly machinery (50S assembly machinery)

The bacterial 50S ribosomal subunit assembly machinery is a complex and highly regulated system responsible for the biogenesis of the large ribosomal subunit in bacteria (Shajani et al., 2011, Annual Review of Biochemistry). This process requires the coordinated folding of 23S and 5S ribosomal RNAs (rRNAs) and the sequential incorporation of approximately 33 ribosomal proteins (Davis & Williamson, 2017, Philosophical Transactions of the Royal Society B). The assembly is facilitated by a diverse group of non-ribosomal assembly factors, including specialized GTPases such as ObgE and EngA, RNA helicases like SrmB and CsdA, and various chaperones that ensure correct RNA-protein interactions (Britton, 2009, Annual Review of Microbiology). Because ribosome biogenesis is essential for bacterial viability, this machinery serves as a critical target for antimicrobial agents (Champney, 2006, Current Opinion in Microbiology). Many traditional antibiotics, such as macrolides and lincosamides, have been shown to inhibit the assembly of the 50S subunit in addition to their well-known role in blocking protein translation in mature ribosomes (Champney, 2001, Antimicrobial Agents and Chemotherapy). These drugs often bind to the 23S rRNA within assembly intermediates, preventing the transition to a functional 50S subunit. Targeting specific assembly factors represents a promising strategy for the development of novel antibiotics designed to overcome existing resistance mechanisms in multi-drug resistant pathogens.

Other names

Large ribosomal subunit assembly machinery50S biogenesis machineryBacterial 50S biogenesis pathway50S subunit assembly factors

Inhibition of large ribosomal subunit biogenesis by binding to 23S rRNA assembly intermediates or blocking the activity of essential assembly factors (Champney, 2001, Antimicrobial Agents and Chemotherapy).