16S ribosomal RNA 3'-major domain

The 16S ribosomal RNA (rRNA) 3'-major domain is a primary structural component of the bacterial 30S ribosomal subunit, constituting the region known as the 'head' of the assembly (Wimberly et al., 2000, Nature). This domain is essential for the fidelity and efficiency of protein synthesis, as it coordinates the binding of messenger RNA (mRNA) and transfer RNAs (tRNAs) at the peptidyl (P) and exit (E) sites (Yusupov et al., 2001, Science). During the elongation phase of translation, the 3'-major domain undergoes significant conformational shifts, often described as 'head swiveling,' which are necessary for the translocation of the mRNA-tRNA complex (Ratje et al., 2010, Nature). Because this domain is highly conserved across bacterial species but distinct from eukaryotic rRNA, it is a potent target for antimicrobial therapy (Wilson, 2014, Nature Reviews Microbiology). Antibiotics like spectinomycin bind to helix 34 within this domain, physically blocking the swiveling motion and preventing translocation (Carter et al., 2000, Nature). Other inhibitors, such as kasugamycin, target the domain to interfere with the initiation of translation (Schluenzen et al., 2006, Nature Structural & Molecular Biology). Consequently, the 3'-major domain is a focal point for studying antibiotic mechanisms and the emergence of resistance mutations.

Other names

16S rRNA head domain30S subunit head domain3'-major domain of the 16S ribosomal RNA

Inhibition of bacterial protein synthesis by binding to the 30S head and blocking translocation or initiation (Wilson, 2014, Nature Reviews Microbiology).