title: [A study of the complex-formation of phenylalanyl-tRNA-synthetase from Escherichia coli using the tRNA-Phe method of small-angle x-ray scattering].
abstract: The method of small-angle X-ray scattering was employed to analyse the equilibrium enzyme-substrate complexes in solution. A new approach of analysis of the experimental data was developed. This type of analysis provides the determination of dissociation constants and structural parameters of enzyme-substrate complexes. The radius of gyration (Rg) and dimensions of half-axis of the equivalent prolonged ellipsoid (a, b) of E. coliphenylalanyl-tRNA synthetase and its complexes with one or two tRNA(Phe) molecules have been determined. The values of these parameters speak in favour of structural rearrangements due to the interaction of the enzyme with tRNA(Phe). The thermodynamic characteristics of phenylalanyl-tRNA synthetase complexes with tRNA(Phe) testify to the negative cooperativity in binding of two tRNA molecules with the enzyme.
authors.forename: F V
authors.initials: FV
authors.lastname: Tuzikov
authors.forename: V V
authors.initials: VV
authors.lastname: Zinov'ev
authors.forename: V I
authors.initials: VI
authors.lastname: Vavilin
authors.forename: E G
authors.initials: EG
authors.lastname: Malygin
authors.forename: V N
authors.initials: VN
authors.lastname: Ankilova
mesh_terms: D000604:Amino Acyl-tRNA Synthetases / Q000378:metabolism*; D004926:Escherichia coli / Q000201:enzymology*; D008433:Mathematics; D010652:Phenylalanine-tRNA Ligase / Q000378:metabolism*; D012346:RNA, Transfer, Amino Acyl / Q000378:metabolism*; D014961:X-Ray Diffraction
chemical_list: D012346:RNA, Transfer, Amino Acyl; D000604:Amino Acyl-tRNA Synthetases; D010652:Phenylalanine-tRNA Ligase
vernacular_title: Issledovanie kompleksoobrazovaniia fenilalanil-tRNK-sintetazy iz Escherichia coli s tRNK-Phe metodom malouglovogo rentgenovskogo rasseianiia.