3teg | pdb_00003teg

Bacterial and Eukaryotic Phenylalanyl-tRNA Synthetases Catalyze Misaminoacylation of tRNAPhe with 3,4-Dihydroxy-L-Phenylalanine (L-Dopa)

spinqualitylabelsall models 3teg, resolution 2.20Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3teg is a 1 chain structure with sequence from Human. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: DAH Related: 3cmq, 3hfv, 3teh Gene: FARS1, FARS2, HSPC320 (HUMAN) Activity: Phenylalanine--tRNA ligase, with EC number 6.1.1.20 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [SYFM_HUMAN] Catalyzes direct attachment of p-Tyr (Tyr) to tRNAPhe. Permits also, with a lower efficiency, the attachment of m-Tyr to tRNAPhe, thereby opening the way for delivery of the misacylated tRNA to the ribosome and incorporation of ROS-damaged amino acid into proteins. Publication Abstract from PubMed Aminoacyl-tRNA synthetases exert control over the accuracy of translation by selective pairing the correct amino acids with their cognate tRNAs, and proofreading the misacylated products. Here we show that three existing, structurally different phenylalanyl-tRNA synthetases-human mitochondrial (HsmtPheRS), human cytoplasmic (HsctPheRS), and eubacterial from Thermus thermophilus (TtPheRS), catalyze mischarging of tRNA(Phe) with an oxidized analog of tyrosine-L-dopa. The lowest level of L-dopa discrimination over the cognate amino acid, exhibited by HsmtPheRS, is comparable to that of tyrosyl-tRNA synthetase. HsmtPheRS and TtPheRS complexes with L-dopa revealed in the active sites an electron density shaping this ligand. HsctPheRS and TtPheRS possessing editing activity are capable of hydrolyzing the exogenous L-dopa-tRNA(Phe) as efficiently as Tyr-tRNA(Phe). However, editing activity of PheRS does not guarantee reduction of the aminoacylation error rate to escape misincorporation of L-dopa into polypeptide chains. Bacterial and Eukaryotic Phenylalanyl-tRNA Synthetases Catalyze Misaminoacylation of tRNA(Phe) with 3,4-Dihydroxy-L-Phenylalanine.,Moor N, Klipcan L, Safro MG Chem Biol. 2011 Oct 28;18(10):1221-9. PMID:22035791 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Aminoacyl tRNA synthetase 3D structures

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