3kt6

Crystal structure of S. cerevisiae tryptophanyl-tRNA synthetase in complex with Trp

spinqualitylabelsall models 3kt6, resolution 2.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3kt6 is a 4 chain structure with sequence from Saccharomyces cerevisiae. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.8Å Ligands: SO4, TRP Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function SYWC_YEAST 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 Specific activation of amino acids by aminoacyl-tRNA synthetases is essential for maintaining translational fidelity. Here, we present crystal structures of Saccharomyces cerevisiae tryptophanyl-tRNA synthetase (sTrpRS) in apo form and in complexes with various ligands. In each complex, there is a sulfate ion bound at the active site which mimics the alpha- or beta-phosphate group of ATP during tryptophan activation. In particular, in one monomer of the sTrpRS-TrpNH(2)O complex, the sulfate ion appears to capture a snapshot of the alpha-phosphate of ATP during its movement towards tryptophan. Simulation study of a human TrpRS-Trp-ATP model shows that during the catalytic process the alpha-phosphate of ATP is driven to an intermediate position equivalent to that of the sulfate ion, then moves further and eventually fluctuates at around 2 A from the nucleophile. A conserved Arg may interact with the oxygen in the scissile bond at the transition state, indicating its critical role in the nucleophilic substitution. Taken together, eukaryotic TrpRSs may adopt an associative mechanism for tryptophan activation in contrast to a dissociative mechanism proposed for bacterial TrpRSs. In addition, structural analysis of the apo sTrpRS reveals a unique feature of fungal TrpRSs, which could be exploited in rational antifungal drug design. Crystal structures of Saccharomyces cerevisiae tryptophanyl-tRNA synthetase: new insights into the mechanism of tryptophan activation and implications for anti-fungal drug design.,Zhou M, Dong X, Shen N, Zhong C, Ding J Nucleic Acids Res. 2010 Jun;38(10):3399-413. Epub 2010 Jan 31. PMID:20123733 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Aminoacyl tRNA synthetase 3D structures

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