Bacterial 70S ribosome intersubunit bridge B5 (Bridge B5)

The Bacterial 70S ribosome intersubunit bridge B5 is a fundamental structural element that maintains the connection between the 30S and 50S ribosomal subunits (Yusupov et al., 2001). It is formed by the interaction between helix 67 of the 23S rRNA on the 50S subunit and helix 44 of the 16S rRNA on the 30S subunit, situated in close proximity to the P-site (Liu & Fredrick, 2016). This bridge is essential for the dynamic movements of the ribosome during translation, specifically the ratcheting motion required for the translocation of mRNA and tRNAs (Dunkle et al., 2011). By stabilizing the ribosomal complex, Bridge B5 ensures the fidelity and efficiency of protein synthesis. Many potent antibiotics, such as aminoglycosides and hygromycin B, target the rRNA components of this bridge to inhibit bacterial growth (Borovinskaya et al., 2008). These drugs often lock the ribosome in a specific state or cause misreading of the mRNA, making the B5 region a critical site for therapeutic intervention against bacterial infections (Wilson, 2014). Understanding the structural dynamics of Bridge B5 is vital for the development of next-generation antimicrobials designed to bypass current resistance mechanisms.

Other names

Intersubunit bridge B5B5 bridge50S P-site bridge B5Ribosomal bridge B5

Inhibition of protein synthesis by interfering with ribosomal translocation and subunit ratcheting through the stabilization or disruption of intersubunit bridges (Dunkle et al., 2011; Borovinskaya et al., 2008).