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1g59
From Proteopedia
(New page: 200px<br /><applet load="1g59" size="450" color="white" frame="true" align="right" spinBox="true" caption="1g59, resolution 2.4Å" /> '''GLUTAMYL-TRNA SYNTHET...) |
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| - | [[Image:1g59.gif|left|200px]]<br /><applet load="1g59" size=" | + | [[Image:1g59.gif|left|200px]]<br /><applet load="1g59" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="1g59, resolution 2.4Å" /> | caption="1g59, resolution 2.4Å" /> | ||
'''GLUTAMYL-TRNA SYNTHETASE COMPLEXED WITH TRNA(GLU).'''<br /> | '''GLUTAMYL-TRNA SYNTHETASE COMPLEXED WITH TRNA(GLU).'''<br /> | ||
==Overview== | ==Overview== | ||
| - | Glutamyl-tRNA synthetases (GluRSs) are divided into two distinct types, with regard to the presence or absence of glutaminyl-tRNA synthetase | + | Glutamyl-tRNA synthetases (GluRSs) are divided into two distinct types, with regard to the presence or absence of glutaminyl-tRNA synthetase (GlnRS) in the genetic translation systems. In the original 19-synthetase systems lacking GlnRS, the 'non-discriminating' GluRS glutamylates both tRNAGlu and tRNAGln. In contrast, in the evolved 20-synthetase systems with GlnRS, the 'discriminating' GluRS aminoacylates only tRNAGlu. Here we report the 2.4 A resolution crystal structure of a 'discriminating' GluRS.tRNAGlu complex from Thermus thermophilus. The GluRS recognizes the tRNAGlu anticodon bases via two alpha-helical domains, maintaining the base stacking. We show that the discrimination between the Glu and Gln anticodons (34YUC36 and 34YUG36, respectively) is achieved by a single arginine residue (Arg 358). The mutation of Arg 358 to Gln resulted in a GluRS that does not discriminate between the Glu and Gln anticodons. This change mimics the reverse course of GluRS evolution from anticodon 'non-dicsriminating' to 'discriminating'. |
==About this Structure== | ==About this Structure== | ||
| - | 1G59 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Thermus_thermophilus Thermus thermophilus]. Active as [http://en.wikipedia.org/wiki/Glutamate--tRNA_ligase Glutamate--tRNA ligase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=6.1.1.17 6.1.1.17] Full crystallographic information is available from [http:// | + | 1G59 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Thermus_thermophilus Thermus thermophilus]. Active as [http://en.wikipedia.org/wiki/Glutamate--tRNA_ligase Glutamate--tRNA ligase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=6.1.1.17 6.1.1.17] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1G59 OCA]. |
==Reference== | ==Reference== | ||
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[[Category: Thermus thermophilus]] | [[Category: Thermus thermophilus]] | ||
[[Category: Nureki, O.]] | [[Category: Nureki, O.]] | ||
| - | [[Category: RSGI, RIKEN | + | [[Category: RSGI, RIKEN Structural Genomics/Proteomics Initiative.]] |
[[Category: Sekine, S.]] | [[Category: Sekine, S.]] | ||
[[Category: Shimada, A.]] | [[Category: Shimada, A.]] | ||
| - | [[Category: Vassylyev, D | + | [[Category: Vassylyev, D G.]] |
[[Category: Yokoyama, S.]] | [[Category: Yokoyama, S.]] | ||
[[Category: aminoacyl-trna synthetase]] | [[Category: aminoacyl-trna synthetase]] | ||
| Line 27: | Line 27: | ||
[[Category: transfer rna]] | [[Category: transfer rna]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 12:46:13 2008'' |
Revision as of 10:46, 21 February 2008
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GLUTAMYL-TRNA SYNTHETASE COMPLEXED WITH TRNA(GLU).
Overview
Glutamyl-tRNA synthetases (GluRSs) are divided into two distinct types, with regard to the presence or absence of glutaminyl-tRNA synthetase (GlnRS) in the genetic translation systems. In the original 19-synthetase systems lacking GlnRS, the 'non-discriminating' GluRS glutamylates both tRNAGlu and tRNAGln. In contrast, in the evolved 20-synthetase systems with GlnRS, the 'discriminating' GluRS aminoacylates only tRNAGlu. Here we report the 2.4 A resolution crystal structure of a 'discriminating' GluRS.tRNAGlu complex from Thermus thermophilus. The GluRS recognizes the tRNAGlu anticodon bases via two alpha-helical domains, maintaining the base stacking. We show that the discrimination between the Glu and Gln anticodons (34YUC36 and 34YUG36, respectively) is achieved by a single arginine residue (Arg 358). The mutation of Arg 358 to Gln resulted in a GluRS that does not discriminate between the Glu and Gln anticodons. This change mimics the reverse course of GluRS evolution from anticodon 'non-dicsriminating' to 'discriminating'.
About this Structure
1G59 is a Single protein structure of sequence from Thermus thermophilus. Active as Glutamate--tRNA ligase, with EC number 6.1.1.17 Full crystallographic information is available from OCA.
Reference
Structural basis for anticodon recognition by discriminating glutamyl-tRNA synthetase., Sekine S, Nureki O, Shimada A, Vassylyev DG, Yokoyama S, Nat Struct Biol. 2001 Mar;8(3):203-6. PMID:11224561
Page seeded by OCA on Thu Feb 21 12:46:13 2008
Categories: Glutamate--tRNA ligase | Single protein | Thermus thermophilus | Nureki, O. | RSGI, RIKEN Structural Genomics/Proteomics Initiative. | Sekine, S. | Shimada, A. | Vassylyev, D G. | Yokoyama, S. | Aminoacyl-trna synthetase | Protein-rna complex | Riken structural genomics/proteomics initiative | Rsgi | Structural genomics | Transfer rna
