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[[Image:2cfo.gif|left|200px]]
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[[Image:2cfo.png|left|200px]]


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{{STRUCTURE_2cfo|  PDB=2cfo  |  SCENE=  }}  
{{STRUCTURE_2cfo|  PDB=2cfo  |  SCENE=  }}  


'''NON-DISCRIMINATING GLUTAMYL-TRNA SYNTHETASE FROM THERMOSYNECHOCOCCUS ELONGATUS IN COMPLEX WITH GLU'''
===NON-DISCRIMINATING GLUTAMYL-TRNA SYNTHETASE FROM THERMOSYNECHOCOCCUS ELONGATUS IN COMPLEX WITH GLU===




==Overview==
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Error-free protein biosynthesis is dependent on the reliable charging of each tRNA with its cognate amino acid. Many bacteria, however, lack a glutaminyl-tRNA synthetase. In these organisms, tRNA(Gln) is initially mischarged with glutamate by a non-discriminating glutamyl-tRNA synthetase (ND-GluRS). This enzyme thus charges both tRNA(Glu) and tRNA(Gln) with glutamate. Discriminating GluRS (D-GluRS), found in some bacteria and all eukaryotes, exclusively generates Glu-tRNA(Glu). Here we present the first crystal structure of a non-discriminating GluRS from Thermosynechococcus elongatus (ND-GluRS(Tel)) in complex with glutamate at a resolution of 2.45 A. Structurally, the enzyme shares the overall architecture of the discriminating GluRS from Thermus thermophilus (D-GluRS(Tth)). We confirm experimentally that GluRS(Tel) is non-discriminating and present kinetic parameters for synthesis of Glu-tRNA(Glu) and of Glu-tRNA(Gln). Anticodons of tRNA(Glu) (34C/UUC36) and tRNA(Gln) (34C/UUG36) differ only in base 36. The pyrimidine base of C36 is specifically recognized in D-GluRS(Tth) by the residue Arg358. In ND-GluRS(Tel) this arginine residue is replaced by glycine (Gly366) presumably allowing both cytosine and the bulkier purine base G36 of tRNA(Gln) to be tolerated. Most other ND-GluRS share this structural feature, leading to relaxed substrate specificity.
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{{ABSTRACT_PUBMED_16876193}}


==About this Structure==
==About this Structure==
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[[Category: Nucleotide-binding]]
[[Category: Nucleotide-binding]]
[[Category: Protein biosynthesis]]
[[Category: Protein biosynthesis]]
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Revision as of 12:17, 27 July 2008

File:2cfo.png

Template:STRUCTURE 2cfo

NON-DISCRIMINATING GLUTAMYL-TRNA SYNTHETASE FROM THERMOSYNECHOCOCCUS ELONGATUS IN COMPLEX WITH GLU

Template:ABSTRACT PUBMED 16876193

About this Structure

2CFO is a Single protein structure of sequence from Synechococcus elongatus. Full crystallographic information is available from OCA.

Reference

Crystal structure of a non-discriminating glutamyl-tRNA synthetase., Schulze JO, Masoumi A, Nickel D, Jahn M, Jahn D, Schubert WD, Heinz DW, J Mol Biol. 2006 Sep 1;361(5):888-97. Epub 2006 Jul 5. PMID:16876193

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