Helicobacter pylori 50S ribosomal subunit (50S subunit)

The Helicobacter pylori 50S ribosomal subunit is the larger component of the bacterial 70S ribosome, playing a fundamental role in protein biosynthesis (UniProt). It is composed of 23S and 5S ribosomal RNA (rRNA) molecules along with approximately 33 ribosomal proteins (PubMed). The subunit contains the peptidyl transferase center (PTC), which catalyzes the formation of peptide bonds, and the polypeptide exit tunnel through which the growing protein chain leaves the ribosome (StatPearls). This subunit is a primary target for several classes of antibiotics, including macrolides, lincosamides, and oxazolidinones (PubChem). In the context of H. pylori, macrolides like clarithromycin bind to the 23S rRNA to inhibit translation, making it a critical target for treating infections linked to gastritis, peptic ulcers, and gastric adenocarcinoma (NIH). However, the emergence of point mutations in the 23S rRNA has led to increasing rates of antibiotic resistance, complicating clinical management (PubMed). Monitoring these genetic biomarkers is increasingly important for tailoring antibiotic treatment to individual patients.

Other names

Large ribosomal subunit50S ribosomeH. pylori 50S subunit23S ribosomal RNA complex

Inhibition of bacterial protein synthesis by binding to the 23S rRNA of the 50S subunit, which prevents peptidyl transfer or blocks the ribosomal exit tunnel, thereby halting the elongation of the polypeptide chain (StatPearls, PubMed).