3hrk

Histidyl-tRNA synthetase from Trypanosoma cruzi (Histidyl-adenylate complex)

spinqualitylabelsall models 3hrk, resolution 3.05Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3hrk is a 2 chain structure with sequence from Trycr. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CL, HAM Related: 3hri, 3hrj Gene: Tc00.1047053507019.40 (TRYCR) Activity: Histidine--tRNA ligase, with EC number 6.1.1.21 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT 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 Crystal structures of histidyl-tRNA synthetase (HisRS) from the eukaryotic parasites Trypanosoma brucei and Trypanosoma cruzi provide a first structural view of a eukaryotic form of this enzyme and reveal differences from bacterial homologs. HisRSs in general contain an extra domain inserted between conserved motifs 2 and 3 of the Class II aminoacyl-tRNA synthetase catalytic core. The current structures show that the three-dimensional topology of this domain is very different in bacterial and archaeal/eukaryotic forms of the enzyme. Comparison of apo and histidine-bound trypanosomal structures indicates substantial active-site rearrangement upon histidine binding but relatively little subsequent rearrangement after reaction of histidine with ATP to form the enzyme's first reaction product, histidyladenylate. The specific residues involved in forming the binding pocket for the adenine moiety differ substantially both from the previously characterized binding site in bacterial structures and from the homologous residues in human HisRSs. The essentiality of the single HisRS gene in T. brucei is shown by a severe depression of parasite growth rate that results from even partial suppression of expression by RNA interference. Crystal structures of trypanosomal histidyl-tRNA synthetase illuminate differences between eukaryotic and prokaryotic homologs.,Merritt EA, Arakaki TL, Gillespie JR, Larson ET, Kelley A, Mueller N, Napuli AJ, Kim J, Zhang L, Verlinde CL, Fan E, Zucker F, Buckner FS, van Voorhis WC, Hol WG J Mol Biol. 2010 Mar 26;397(2):481-94. Epub 2010 Feb 2. PMID:20132829 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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