1zq1
From Proteopedia
Structure of GatDE tRNA-Dependent Amidotransferase from Pyrococcus abyssi
Structural highlights
Function[GATD_PYRAB] Allows the formation of correctly charged Gln-tRNA(Gln) through the transamidation of misacylated Glu-tRNA(Gln) in organisms which lack glutaminyl-tRNA synthetase. The reaction takes place in the presence of glutamine and ATP through an activated gamma-phospho-Glu-tRNA(Gln). The GatDE system is specific for glutamate and does not act on aspartate (By similarity). [GATE_PYRAB] Allows the formation of correctly charged Gln-tRNA(Gln) through the transamidation of misacylated Glu-tRNA(Gln) in organisms which lack glutaminyl-tRNA synthetase. The reaction takes place in the presence of glutamine and ATP through an activated gamma-phospho-Glu-tRNA(Gln). The GatDE system is specific for glutamate and does not act on aspartate (By similarity). 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 PubMedBesides direct charging of tRNAs by aminoacyl-tRNA synthetases, indirect routes also ensure attachment of some amino acids onto tRNA. Such routes may explain how new amino acids entered into protein synthesis. In archaea and in most bacteria, tRNA(Gln) is first misaminoacylated by glutamyl-tRNA synthetase. Glu-tRNA(Gln) is then matured into Gln-tRNA(Gln) by a tRNA-dependent amidotransferase. We report the structure of a tRNA-dependent amidotransferase-that of GatDE from Pyrococcus abyssi. The 3.0 A resolution crystal structure shows a tetramer with two GatD molecules as the core and two GatE molecules at the periphery. The fold of GatE cannot be related to that of any tRNA binding enzyme. The ammonium donor site on GatD and the tRNA site on GatE are markedly distant. Comparison of GatD and L-asparaginase structures shows how the motion of a beta hairpin region containing a crucial catalytic threonine may control the overall reaction cycle of GatDE. Structural basis for tRNA-dependent amidotransferase function.,Schmitt E, Panvert M, Blanquet S, Mechulam Y Structure. 2005 Oct;13(10):1421-33. PMID:16216574[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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