Eukaryotic 80S ribosome decoding center (80S DC) (80S DC)

The eukaryotic 80S ribosome decoding center is a specialized functional region located within the small (40S) ribosomal subunit, primarily composed of the 18S ribosomal RNA (specifically helix 44) [1, 4]. Its fundamental biological role is to ensure the accuracy of translation by monitoring the base-pairing between the mRNA codon and the anticodon of the incoming aminoacyl-tRNA [1, 16]. This site is a major therapeutic target for "nonsense suppression therapy," which utilizes small molecules to treat genetic disorders caused by premature termination codons (PTCs) [5, 13]. Drugs such as aminoglycosides (e.g., gentamicin, ELX-02) and ataluren interact with the decoding center to reduce the stringency of the proofreading mechanism, thereby promoting the incorporation of near-cognate tRNAs at PTCs and allowing the production of full-length, functional proteins [10, 15, 17]. Beyond genetic diseases like cystic fibrosis and Duchenne muscular dystrophy, the decoding center and related sites, such as the peptidyl transferase center (PTC), are also investigated as targets for anticancer therapies due to the heightened translational demands of malignant cells [1, 3]. However, therapeutic targeting of this site must overcome challenges such as potential toxicity from mitochondrial ribosome interference and the risk of inducing readthrough at natural stop codons [10, 11].

Other names

Decoding siteA-site40S decoding centerh44 decoding siteAminoacyl-tRNA binding sitePeptidyl transferase centerPeptide exit tunnel

Induction of translational readthrough of premature termination codons (PTCs) and inhibition of protein synthesis.