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SOLUTION STRUCTURE OF MULTI-FUNCTIONAL PEPTIDE MOTIF-1 PRESENT IN HUMAN GLUTAMYL-PROLYL TRNA SYNTHETASE (EPRS).
Structural highlights
FunctionSYEP_HUMAN Catalyzes the attachment of the cognate amino acid to the corresponding tRNA in a two-step reaction: the amino acid is first activated by ATP to form a covalent intermediate with AMP and is then transferred to the acceptor end of the cognate tRNA. Component of the GAIT (gamma interferon-activated inhibitor of translation) complex which mediates interferon-gamma-induced transcript-selective translation inhibition in inflammation processes. Upon interferon-gamma activation and subsequent phosphorylation dissociates from the multisynthetase complex and assembles into the GAIT complex which binds to stem loop-containing GAIT elements in the 3'-UTR of diverse inflammatory mRNAs (such as ceruplasmin) and suppresses their translation.[1] [2] [3] 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 PubMedHuman bifunctional glutamyl-prolyl-tRNA synthetase (EPRS) contains three tandem repeats linking the two catalytic domains. These repeated motifs have been shown to be involved in protein-protein and protein-nucleic acid interactions. The single copy of the homologous motifs has also been found in several different aminoacyl-tRNA synthetases. The solution structure of repeat 1 (EPRS-R1) and the secondary structure of the whole appended domain containing three repeated motifs in EPRS (EPRS-R123) was determined by nuclear magnetic resonance (NMR) spectroscopy. EPRS-R1 consists of two helices (residues 679-699 and 702-721) arranged in a helix-turn-helix, which is similar to other RNA binding proteins and the j-domain of DnaJ, and EPRS-R123 is composed of three helix-turn-helix motifs linked by an unstructured loop. When tRNA is bound to the appended domain, chemical shifts of several residues in each repeat are perturbed. However, the perturbed residues in each repeat are not the same although they are in the same binding surface, suggesting that each repeat in the appended domain is dynamically arranged to maximize contacts with tRNA. The affinity of tRNA to the three-repeated motif was much higher than to the single motif. These results indicate that each of the repeated motifs has a weak intrinsic affinity for tRNA, but the repetition of the motifs may be required to enhance binding affinity. Thus, the results of this work gave information on the RNA-binding mode of the multifunctional peptide motif attached to different ARSs and the functional reason for the repetition of this motif. Structural analysis of multifunctional peptide motifs in human bifunctional tRNA synthetase: identification of RNA-binding residues and functional implications for tandem repeats.,Jeong EJ, Hwang GS, Kim KH, Kim MJ, Kim S, Kim KS Biochemistry. 2000 Dec 26;39(51):15775-82. PMID:11123902[4] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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