Bacterial ribosomal 30S A-site (30S A-site)

The bacterial ribosomal 30S A-site is a region in the small (30S) subunit of the prokaryotic ribosome responsible for the initial selection and binding of aminoacyl-tRNA during translation. The A-site, located within the complex of 16S ribosomal RNA and associated proteins, ensures decoding accuracy by monitoring base pairing between the mRNA codon and the tRNA anticodon. Universal residues in 16S rRNA (such as A1492 and A1493) play critical roles in this process. The 30S A-site is a major target for several classes of antibiotics, notably aminoglycosides and spectinomycin, which bind to this region and disrupt normal translational fidelity, thereby inhibiting bacterial protein synthesis. Mutations in A-site constituents can confer resistance to these drugs, presenting a clinical challenge and motivating ongoing antibiotic development[1][2][3][4][5].

Other names

Prokaryotic ribosomal small subunit A-site30S decoding siteRibosomal A-site

Interference with decoding by stabilizing erroneous tRNA–mRNA pairing. Disruption of translocation and fidelity mechanisms in protein synthesis. Binding to specific rRNA residues (notably 16S RNA nucleotides A1492, A1493, G530).