Primary Citation of Related Structures: 1BBU, 1BBW
PubMed Abstract:
Lysyl-tRNA synthetase is a member of the class II aminoacyl-tRNA synthetases and catalyses the specific aminoacylation of tRNA(Lys). The crystal structure of the constitutive lysyl-tRNA synthetase (LysS) from Escherichia coli has been determined to 2.7 A resolution in the unliganded form and in a complex with the lysine substrate ...
Lysyl-tRNA synthetase is a member of the class II aminoacyl-tRNA synthetases and catalyses the specific aminoacylation of tRNA(Lys). The crystal structure of the constitutive lysyl-tRNA synthetase (LysS) from Escherichia coli has been determined to 2.7 A resolution in the unliganded form and in a complex with the lysine substrate. A comparison between the unliganded and lysine-bound structures reveals major conformational changes upon lysine binding. The lysine substrate is involved in a network of hydrogen bonds. Two of these interactions, one between the alpha-amino group and the carbonyl oxygen of Gly 216 and the other between the carboxylate group and the side chain of Arg 262, trigger a subtle and complicated reorganization of the active site, involving the ordering of two loops (residues 215-217 and 444-455), a change in conformation of residues 393-409, and a rotation of a 4-helix bundle domain (located between motif 2 and 3) by 10 degrees. The result of these changes is a closing up of the active site upon lysine binding.
Related Citations:
Crystal Structure of the Lysyl-tRNA Synthetase (Lysu) from Escherichia Coli Onesti, S., Miller, A.D., Brick, P. (1995) Structure 3: 163
Comparison of the Enzymatic Properties of Two Escherichia Coli Lysyl-tRNA Synthetase Species Brevet, A., Chen, J., Leveque, F., Blanquet, S., Plateau, P. (1995) J Biol Chem 270: 14439
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