50S subunit of bacterial ribosome (50S subunit)

The **50S subunit of the bacterial ribosome** is the larger component of the prokaryotic (bacterial and archaeal) 70S ribosome, functioning primarily in the catalysis of peptide bond formation during protein synthesis. It is composed of 23S and 5S ribosomal RNAs and roughly 31 ribosomal proteins, forming a complex secondary and tertiary structure. The 50S subunit provides crucial functional sites: it hosts the peptidyl transferase center, binding sites for G-proteins required for initiation, elongation, and termination, and prevents premature polypeptide release. It is a validated **antibacterial drug target**, as several clinically used antibiotic classes, including macrolides and chloramphenicol, exert their effect by binding to specific sites on the 50S subunit and disrupting translation. Due to its essential role in translation and unique prokaryotic components, it serves as an ideal target for antibacterial agents, but selectivity and resistance remain ongoing therapeutic challenges[2][4][6][1][5].

Other names

Prokaryotic large ribosomal subunitBacterial 50S ribosomal subunitLarge subunit of bacterial ribosome

Inhibition of protein synthesis by blocking peptide bond formation; Inhibition of translocation along mRNA; Interference with elongation or initiation steps of translation