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| [[Image:1jjc.gif|left|200px]] | | {{Seed}} |
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| {{STRUCTURE_1jjc| PDB=1jjc | SCENE= }} | | {{STRUCTURE_1jjc| PDB=1jjc | SCENE= }} |
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| '''Crystal structure at 2.6A resolution of phenylalanyl-tRNA synthetase complexed with phenylalanyl-adenylate in the presence of manganese'''
| | ===Crystal structure at 2.6A resolution of phenylalanyl-tRNA synthetase complexed with phenylalanyl-adenylate in the presence of manganese=== |
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| ==Overview==
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| The crystal structure of phenylalanyl-tRNA synthetase (PheRS) from Thermus thermophilus, a class II aminoacyl-tRNA synthetase, complexed with phenylalanyl-adenylate (Phe-AMP) was determined at 2.6 A resolution. Crystals of native PheRS were soaked in a solution containing phenylalanine and ATP in the presence of Mn(2+) ions. The first step of the aminoacylation reaction proceeds within the crystals, resulting in Phe-AMP formation at the active site. Specific recognition of the phenylalanine portion of the Phe-AMP is achieved by interactions of the phenyl ring of Phe-AMP with two neighbouring residues, Phealpha258 and Phealpha260. No manganese ions were observed within the active site; their role in the formation of the transition state may be assigned to a number of polar residues and water molecules. In the anomalous Fourier difference map, a divalent metal ion was detected at the interface of the alpha- and beta-subunits at a short distance from motif 3 residues participating in the substrate binding. A sulfate ion, which was identified on the protein surface, may mediate the interactions of PheRS with DNA. Visible conformational changes were detected in the active-site area adjacent to the position of the Phe-AMP, compared with the structure of PheRS complexed with a synthetic adenylate analogue (phenylalaninyl-adenylate). Based on the known structures of the substrate-free enzyme and its complexes with various ligands, a general scheme for the phenylalanylation mechanism is proposed. | | The line below this paragraph, {{ABSTRACT_PUBMED_11679717}}, adds the Publication Abstract to the page |
| | (as it appears on PubMed at http://www.pubmed.gov), where 11679717 is the PubMed ID number. |
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| | {{ABSTRACT_PUBMED_11679717}} |
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| ==About this Structure== | | ==About this Structure== |
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| [[Category: Phenylalanyl-trna]] | | [[Category: Phenylalanyl-trna]] |
| [[Category: Thermus thermophilus]] | | [[Category: Thermus thermophilus]] |
| ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 21:17:31 2008'' | | |
| | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 20:20:01 2008'' |
