title: The crystal structures of T. thermophilus lysyl-tRNA synthetase complexed with E. coli tRNA(Lys) and a T. thermophilus tRNA(Lys) transcript: anticodon recognition and conformational changes upon binding of a lysyl-adenylate analogue.
abstract: The crystal structures of Thermus thermophilus lysyl-tRNA synthetase, a class IIb aminoacyl-tRNA synthetase, complexed with Escherchia coli tRNA(Lys)(mnm5 s2UUU) at 2.75 A resolution and with a T. thermophilus tRNA(Lys)(CUU) transcript at 2.9 A resolution are described. In both complexes only the tRNA anticodon stem-loop is well ordered. The mode of binding of the anticodon stem-loop to the N-terminal beta-barrel domain is similar to that previously found for the homologous class IIb aspartyl-tRNA synthetase-tRNA(Asp) complex except in the region of the wobble base 34 where either mnm5 s2U or C can be accommodated. The specific recognition of the other anticodon bases, U-35 and U-36, which are both major identity elements in the lysine system, is also described. Additional crystallographic data on a ternary complex with a lysyl-adenylate analogue show that binding of the intermediate induces significant conformational changes in the vicinity of the active site of the enzyme.
authors.affiliation: European Molecular Biology Laboratory, Grenoble Outstation, France.
authors.forename: S
authors.initials: S
authors.lastname: Cusack
authors.forename: A
authors.initials: A
authors.lastname: Yaremchuk
authors.forename: M
authors.initials: M
authors.lastname: Tukalo
mesh_terms: D000595:Amino Acid Sequence; D000604:Amino Acyl-tRNA Synthetases / Q000737:chemistry*; D000926:Anticodon / Q000737:chemistry*; D001665:Binding Sites; D003460:Crystallization; D018360:Crystallography, X-Ray; D004926:Escherichia coli / Q000737:chemistry; D008958:Models, Molecular; D008969:Molecular Sequence Data; D011485:Protein Binding; D011487:Protein Conformation; D017433:Protein Structure, Secondary; D017434:Protein Structure, Tertiary; D012349:RNA, Transfer, Asp / Q000737:chemistry; D012357:RNA, Transfer, Lys / Q000737:chemistry*; D016415:Sequence Alignment; D016963:Thermus thermophilus / Q000201:enzymology*
chemical_list: D000926:Anticodon; D012349:RNA, Transfer, Asp; D012357:RNA, Transfer, Lys; D000604:Amino Acyl-tRNA Synthetases