2akw

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[[Image:2akw.gif|left|200px]]
[[Image:2akw.gif|left|200px]]
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{{Structure
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<!--
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|PDB= 2akw |SIZE=350|CAPTION= <scene name='initialview01'>2akw</scene>, resolution 2.800&Aring;
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The line below this paragraph, containing "STRUCTURE_2akw", creates the "Structure Box" on the page.
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|SITE=
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You may change the PDB parameter (which sets the PDB file loaded into the applet)
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|LIGAND= <scene name='pdbligand=200:4-CHLORO-L-PHENYLALANINE'>200</scene>, <scene name='pdbligand=MN:MANGANESE+(II)+ION'>MN</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene>
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or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
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|ACTIVITY= <span class='plainlinks'>[http://en.wikipedia.org/wiki/Phenylalanine--tRNA_ligase Phenylalanine--tRNA ligase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=6.1.1.20 6.1.1.20] </span>
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or leave the SCENE parameter empty for the default display.
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|GENE=
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-->
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|DOMAIN=
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{{STRUCTURE_2akw| PDB=2akw | SCENE= }}
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|RELATEDENTRY=[[1pys|1pys]], [[1eiy|1eiy]], [[1jjc|1jjc]], [[1b70|1B70]], [[1b7y|1B7Y]]
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|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2akw FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2akw OCA], [http://www.ebi.ac.uk/pdbsum/2akw PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=2akw RCSB]</span>
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}}
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'''Crystal Structure of T.Thermophilus Phenylalanyl-tRNA synthetase complexed with p-Cl-Phenylalanine'''
'''Crystal Structure of T.Thermophilus Phenylalanyl-tRNA synthetase complexed with p-Cl-Phenylalanine'''
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[[Category: Safro, M G.]]
[[Category: Safro, M G.]]
[[Category: Tworowski, D E.]]
[[Category: Tworowski, D E.]]
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[[Category: protein-unnatural amino acid complex]]
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[[Category: Protein-unnatural amino acid complex]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 19:10:24 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Mar 31 01:54:01 2008''
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Revision as of 16:10, 3 May 2008

Image:2akw.gif

Template:STRUCTURE 2akw

Crystal Structure of T.Thermophilus Phenylalanyl-tRNA synthetase complexed with p-Cl-Phenylalanine


Overview

Aminoacyl-tRNA synthetases (aaRSs) exert control over the faithful transfer of amino acids onto cognate tRNAs. Since chemical structures of various amino acids closely resemble each other, it is difficult to discriminate between them. Editing activity has been evolved by certain aaRSs to resolve the problem. In this study, we determined the crystal structures of complexes of T. thermophilus phenylalanyl-tRNA synthetase (PheRS) with L-tyrosine, p-chloro-phenylalanine, and a nonhydrolyzable tyrosyl-adenylate analog. The structures demonstrate plasticity of the synthetic site capable of binding substrates larger than phenylalanine and provide a structural basis for the proofreading mechanism. The editing site is localized at the B3/B4 interface, 35 A from the synthetic site. Glubeta334 plays a crucial role in the specific recognition of the Tyr moiety in the editing site. The tyrosyl-adenylate analog binds exclusively in the synthetic site. Both structural data and tyrosine-dependent ATP hydrolysis enhanced by tRNA(Phe) provide evidence for a preferential posttransfer editing pathway in the phenylalanine-specific system.

About this Structure

2AKW is a Protein complex structure of sequences from Thermus thermophilus. Full crystallographic information is available from OCA.

Reference

Structural basis for discrimination of L-phenylalanine from L-tyrosine by phenylalanyl-tRNA synthetase., Kotik-Kogan O, Moor N, Tworowski D, Safro M, Structure. 2005 Dec;13(12):1799-807. PMID:16338408 Page seeded by OCA on Sat May 3 19:10:24 2008

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