30S ribosomal subunit A site (30S A site)

The **30S ribosomal subunit A site** is a specific region on the prokaryotic small ribosomal subunit (30S), composed of 16S rRNA and multiple proteins. The A (aminoacyl) site is responsible for accommodating aminoacyl-tRNA during protein synthesis and along with the P and E sites, orchestrates the decoding of mRNA. The 30S A site monitors the base-pairing between the incoming aminoacyl-tRNA anticodon and the mRNA codon, ensuring accuracy during translation[1][2][3][4]. This site is a critical target for many clinically important antibiotics, such as streptomycin and paromomycin, which bind to the A site and either cause errors in translation or inhibit the movement of tRNA and mRNA during protein synthesis[2][4]. These features make the 30S A site a well-validated antibacterial target, but drugs interacting here may cause side effects in humans due to similarities with mitochondrial ribosomes[4].

Other names

30S A siteAminoacyl site of 30S30S ribosome A site

Inhibition of translation by interfering with codon-anticodon recognition (decoding); Disruption of ribosomal fidelity, causing misreading of mRNA; Blocking of translocation