2amc
From Proteopedia
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| - | [[Image:2amc.gif|left|200px]] | + | [[Image:2amc.gif|left|200px]] |
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| - | '''Crystal structure of Phenylalanyl-tRNA synthetase complexed with L-tyrosine''' | + | {{Structure |
| + | |PDB= 2amc |SIZE=350|CAPTION= <scene name='initialview01'>2amc</scene>, resolution 2.70Å | ||
| + | |SITE= | ||
| + | |LIGAND= <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene> and <scene name='pdbligand=TYR:TYROSINE'>TYR</scene> | ||
| + | |ACTIVITY= [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] | ||
| + | |GENE= | ||
| + | }} | ||
| + | |||
| + | '''Crystal structure of Phenylalanyl-tRNA synthetase complexed with L-tyrosine''' | ||
| + | |||
==Overview== | ==Overview== | ||
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==About this Structure== | ==About this Structure== | ||
| - | 2AMC is a [ | + | 2AMC is a [[Protein complex]] structure of sequences from [http://en.wikipedia.org/wiki/Thermus_thermophilus Thermus thermophilus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2AMC OCA]. |
==Reference== | ==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:[http:// | + | 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:[http://www.ncbi.nlm.nih.gov/pubmed/16338408 16338408] |
[[Category: Phenylalanine--tRNA ligase]] | [[Category: Phenylalanine--tRNA ligase]] | ||
[[Category: Protein complex]] | [[Category: Protein complex]] | ||
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[[Category: protein-amino acid complex]] | [[Category: protein-amino acid complex]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 15:51:17 2008'' |
Revision as of 13:51, 20 March 2008
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| , resolution 2.70Å | |||||||
|---|---|---|---|---|---|---|---|
| Ligands: | , and | ||||||
| Activity: | Phenylalanine--tRNA ligase, with EC number 6.1.1.20 | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
Crystal structure of Phenylalanyl-tRNA synthetase complexed with L-tyrosine
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
2AMC 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
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