2rtx | pdb_00002rtx

Solution structure of the GGQ domain of YaeJ protein from Escherichia coli

spinqualitylabelsall models 2rtx, 20 NMR models Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2rtx is a 1 chain structure with sequence from Ecoli. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Gene: yaeJ, b0191, JW0187 (ECOLI) Activity: Aminoacyl-tRNA hydrolase, with EC number 3.1.1.29 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [ARFB_ECOLI] Rescues stalled ribosomes. Can hydrolyze peptidyl-tRNA on ribosomes stalled by both non-stop mRNAs and mRNAs that contain rare codon clusters. May function as a complementary rescue system when the stalled ribosome can not be rescued by the SsrA(tmRNA)-SmpB quality control system or the alternative ribosome-rescue factor A. Publication Abstract from PubMed The YaeJ protein is a codon-independent release factor with peptidyl-tRNA hydrolysis (PTH) activity, and functions as a stalled-ribosome rescue factor in Escherichia coli. To identify residues required for YaeJ function, we performed mutational analysis for in vitro PTH activity towards rescue of ribosomes stalled on a non-stop mRNA, and for ribosome-binding efficiency. We focused on residues conserved among bacterial YaeJ proteins. Additionally, we determined the solution structure of the GGQ domain of YaeJ from E. coli using nuclear magnetic resonance spectroscopy. YaeJ and a human homolog, ICT1, had similar levels of PTH activity, despite various differences in sequence and structure. While no YaeJ-specific residues important for PTH activity occur in the structured GGQ domain, Arg118, Leu119, Lys122, Lys129 and Arg132 in the following C-terminal extension were required for PTH activity. All of these residues are completely conserved among bacteria. The equivalent residues were also found in the C-terminal extension of ICT1, allowing an appropriate sequence alignment between YaeJ and ICT1 proteins from various species. Single amino acid substitutions for each of these residues significantly decreased ribosome-binding efficiency. These biochemical findings provide clues to understanding how YaeJ enters the A-site of stalled ribosomes. Identification of residues required for stalled-ribosome rescue in the codon-independent release factor YaeJ.,Kogure H, Handa Y, Nagata M, Kanai N, Guntert P, Kubota K, Nameki N Nucleic Acids Res. 2013 Dec 9. PMID:24322300 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Peptidyl-tRNA hydrolase

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