Structural dynamics of ribosomal RNA during decoding on the ribosome - PubMed

Review

Structural dynamics of ribosomal RNA during decoding on the ribosome

Marina V Rodnina et al. Biochimie. 2002 Aug.

Abstract

Decoding is a multistep process by which the ribosome accurately selects aminoacyl-tRNA (aa-tRNA) that matches the mRNA codon in the A site. The correct geometry of the codon-anticodon complex is monitored by the ribosome, resulting in conformational changes in the decoding center of the small (30S) ribosomal subunit by an induced-fit mechanism. The recognition of aa-tRNA is modulated by changes of the ribosome conformation in regions other than the decoding center that may either affect the architecture of the latter or alter the communication of the 30S subunit with the large (50S) subunit where the GTPase and peptidyl transferase centers are located. Correct codon-anticodon complex formation greatly accelerates the rates of GTP hydrolysis and peptide bond formation, indicating the importance of crosstalk between the subunits and the role of the 50S subunit in aa-tRNA selection. In the present review, recent results of the ribosome crystallography, cryoelectron microscopy (cryo-EM), genetics, rapid kinetics and biochemical approaches are reviewed which show that the dynamics of the structure of ribosomal RNA (rRNA) play a crucial role in decoding.

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