1qtq

GLUTAMINYL-TRNA SYNTHETASE COMPLEXED WITH TRNA AND AN AMINO ACID ANALOG

spinqualitylabelsall models 1qtq, resolution 2.25Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1qtq is a 2 chain structure with sequence from Escherichia coli. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.25Å Ligands: QSI, SO4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function SYQ_ECOLI Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed BACKGROUND: Aminoacyl-tRNA synthetases covalently link a specific amino acid to the correct tRNA. The fidelity of this reaction is essential for accurate protein synthesis. Each synthetase has a specific molecular mechanism to distinguish the correct pair of substrates from the pool of amino acids and isologous tRNA molecules. In the case of glutaminyl-tRNA synthetase (GlnRS) the prior binding of tRNA is required for activation of glutamine by ATP. A complete understanding of amino acid specificity in GlnRS requires the determination of the structure of the synthetase with both tRNA and substrates bound. RESULTS: A stable glutaminly-adenylate analog, which inhibits GlnRS with a Ki of 1.32 microM, was synthesized and cocrystallized with GlnRS and tRNA2Gln. The crystal structure of this ternary complex has been refined at 2.4 A resolution and shows the interactions made between glutamine and its binding site. CONCLUSIONS: To select against glutamic acid or glutamate, both hydrogen atoms of the nitrogen of the glutamine sidechain are recognized. The hydroxyl group of Tyr211 and a water molecule are responsible for this recognition; both are obligate hydrogen-bond acceptors due to a network of interacting sidechains and water molecules. The prior binding of tRNAGln that is required for amino acid activation may result from the terminal nucleotide, A76, packing against and orienting Tyr211, which forms part of the amino acid binding site. How glutaminyl-tRNA synthetase selects glutamine.,Rath VL, Silvian LF, Beijer B, Sproat BS, Steitz TA Structure. 1998 Apr 15;6(4):439-49. PMID:9562563 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Aminoacyl tRNA synthetase 3D structures Transfer RNA (tRNA)

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