1iyw: Difference between revisions

Revision as of 14:14, 1 July 2008

This article has been automatically seeded. Changes to this page should pertain to the PDB entry only and not to the protein or biomolecule in general.

File:1iyw.png

Template:STRUCTURE 1iyw

Preliminary Structure of Thermus thermophilus Ligand-Free Valyl-tRNA SynthetasePreliminary Structure of Thermus thermophilus Ligand-Free Valyl-tRNA Synthetase

Template:ABSTRACT PUBMED 12554880

About this StructureAbout this Structure

1IYW is a Single protein structure of sequence from Thermus thermophilus. Full crystallographic information is available from OCA.

ReferenceReference

Mechanism of molecular interactions for tRNA(Val) recognition by valyl-tRNA synthetase., Fukai S, Nureki O, Sekine S, Shimada A, Vassylyev DG, Yokoyama S, RNA. 2003 Jan;9(1):100-11. PMID:12554880

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Proteopedia Page Contributors and Editors (what is this?)Proteopedia Page Contributors and Editors (what is this?)

OCA

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-'''Preliminary Structure of Thermus thermophilus Ligand-Free Valyl-tRNA Synthetase'''
+===Preliminary Structure of Thermus thermophilus Ligand-Free Valyl-tRNA Synthetase===
-==Overview==
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-The molecular interactions between valyl-tRNA synthetase (ValRS) and tRNA(Val), with the C34-A35-C36 anticodon, from Thermus thermophilus were studied by crystallographic analysis and structure-based mutagenesis. In the ValRS-bound structure of tRNA(Val), the successive A35-C36 residues (the major identity elements) of tRNA(Val) are base-stacked upon each other, and fit into a pocket on the alpha-helix bundle domain of ValRS. Hydrogen bonds are formed between ValRS and A35-C36 of tRNA(Val) in a base-specific manner. The C-terminal coiled-coil domain of ValRS interacts electrostatically with A20 and hydrophobically with the G19*C56 tertiary base pair. The loss of these interactions by the deletion of the coiled-coil domain of ValRS increased the K(M) value for tRNA(Val) 28-fold and decreased the k(cat) value 19-fold in the aminoacylation. The tRNA(Val) K(M) and k(cat) values were increased 21-fold and decreased 32-fold, respectively, by the disruption of the G18*U55 and G19*C56 tertiary base pairs, which associate the D- and T-loops for the formation of the L-shaped tRNA structure. Therefore, the coiled-coil domain of ValRS is likely to stabilize the L-shaped tRNA structure during the aminoacylation reaction.
+The line below this paragraph, {{ABSTRACT_PUBMED_12554880}}, adds the Publication Abstract to the page
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+{{ABSTRACT_PUBMED_12554880}}
 ==About this Structure==
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 [[Category: Rsgi]]
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