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23S ribosomal RNA

Pseudoknot of the domain G(G12) of 23S ribosomal RNA
PK-G12rRNA secondary structure.jpg
Predicted secondary structure and sequence conservation of PK-G12rRNA
Other data
RNA typeGene; rRNA
PDB structuresPDBe
A 3D representation of the ribosome. This is a view of the 3D arrangement of the 23S and 5S rRNA in the Escherichia coli 50S ribosomal subunit based on a cryo-electron microscopic reconstruction.[1]

The 23S rRNA is a 2904 nt long (in E. coli) component of the large subunit (50S) of the bacterial/archean ribosome. The ribosomal peptidyl transferase activity resides in domain V of this rRNA, and this domain is the most common binding site for antibiotics that inhibit translation. A well-known member of this antibiotic class, chloramphenicol, acts by inhibiting peptide bond formation, with recent 3D-structural studies showing two different binding sites depending on the species of ribosome. Linezolid and quinupristin-dalfopristin also bind to the 23S rRNA, and cross-resistance has been demonstrated between these antibiotics.[citation needed] Compared to 16S rRNA genes, 23S rRNA genes typically have higher sequence variations including insertions and/or deletions.[2]

23S rRNA Functions

In general, rRNA has an essential function of peptidyl transferase, the stimulating core of the ribosome plays role in the peptide bond configuration. Both peptidyl-tRNA and aminoacyl-tRNA are important for synthesizing protein and transpeptidation response. However, 23S rRNA positions which are G2252, A2451, U2506, and U2585 have a significant function for tRNA binding in P site of the large ribosomal subunit. These modification nucleotides in site P can inhibit peptidyl-tRNA from binding and also remains U2555 modification intervene with transferring peptidyl-tRNA to puromycin. Furthermore, the chemical modification of half of these positions G2251, G2253, A2439, and U2584 can not prevent the tRNA binding. Peptidyl-tRNA of 50s subunits which binds to the P site preserve eight positions of 23S rRNA from chemical modification. On the other hand, 23S rRNA impacts on mutation for cell growth. Mutations A1912G, A1919G and Ψ1917C have a powerful growth phenotypes and they prevent translation while mutation A1916G has a simple growth phenotype and it leads to defect in the 50S subunits.[3]

See also


  1. ^ Mueller F, Sommer I, Baranov P, Matadeen R, Stoldt M, Wöhnert J, Görlach M, van Heel M, Brimacombe R (2000). "The 3D arrangement of the 23 S and 5 S rRNA in the Escherichia coli 50 S ribosomal subunit based on a cryo-electron microscopic reconstruction at 7.5 Å resolution". J Mol Biol. 298 (1): 35–59. doi:10.1006/jmbi.2000.3635. PMID 10756104.
  2. ^ Pei A, Nossa CW, Chokshi P, Blaser MJ, Yang L, Rosmarin DM, Pei Z, Stajich JE (5 May 2009). "Diversity of 23S rRNA Genes within Individual Prokaryotic Genomes". PLoS ONE. 4 (5): e5437. doi:10.1371/journal.pone.0005437. PMC 2672173. PMID 19415112.
  3. ^ Long KS, Munck C, Andersen TM, Schaub MA, Hobbie SN, Bottger EC, Vester B (9 August 2010). "Mutations in 23S rRNA at the Peptidyl Transferase Center and Their Relationship to Linezolid Binding and Cross-Resistance". Antimicrobial Agents and Chemotherapy. 54 (11): 4705–4713. doi:10.1128/AAC.00644-10. PMC 2976117. PMID 20696869.

External links