4v63

Publication Abstract from PubMed

At termination of protein synthesis, type I release factors promote hydrolysis of the peptidyl-transfer RNA linkage in response to recognition of a stop codon. Here we describe the crystal structure of the Thermus thermophilus 70S ribosome in complex with the release factor RF1, tRNA and a messenger RNA containing a UAA stop codon, at 3.2 A resolution. The stop codon is recognized in a pocket formed by conserved elements of RF1, including its PxT recognition motif, and 16S ribosomal RNA. The codon and the 30S subunit A site undergo an induced fit that results in stabilization of a conformation of RF1 that promotes its interaction with the peptidyl transferase centre. Unexpectedly, the main-chain amide group of Gln 230 in the universally conserved GGQ motif of the factor is positioned to contribute directly to peptidyl-tRNA hydrolysis.

Structural basis for translation termination on the 70S ribosome.,Laurberg M, Asahara H, Korostelev A, Zhu J, Trakhanov S, Noller HF Nature. 2008 Aug 14;454(7206):852-7. Epub 2008 Jul 2. PMID:18596689^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.