Structure at 2.6 A resolution of phenylalanyl-tRNA synthetase complexed with phenylalanyl-adenylate in the presence of manganese.Fishman, R., Ankilova, V., Moor, N., Safro, M.
(2001) Acta Crystallogr.,Sect.D 57: 1534-1544
- PubMed: 11679717
- PubMed Abstract:
- The crystal structure of phenylalanyl-tRNA synthetase from Thermus thermophilus complexed with cognate tRNA-Phe
Goldgur, Y.,Mosyak, L.,Reshetnikova, L.,Ankilova, V.,Khodyreva, S.,Safro, M.
(1997) Structure 5: 59
- Structure pf phenylalanyl-tRNA synthetase from Thermus thermophilus
Mosyak, L.,Reshetnikova, L.,Goldgur, Y.,Delarue, M.,Safro, M.
(1995) Nat.Struct.Mol.Biol. 2: 537
- Crystal Structures of phenylalnyl-tRNA synthetase complexed with phenylalanine and phenylalanyl-adenylate analogue
Reshenikova, L.,Moor, N.,Lavrik, O.,Vassyliev, D.
(1999) J.Mol.Biol. 287: 555
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 ...
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.
Department of Structural Biology, Weizmann Institute of Science, Rehovot 76100, Israel.