1VBM

Crystal structure of the Escherichia coli tyrosyl-tRNA synthetase complexed with Tyr-AMS


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.284 
  • R-Value Work: 0.246 
  • R-Value Observed: 0.246 

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This is version 1.3 of the entry. See complete history


Literature

Structural snapshots of the KMSKS loop rearrangement for amino acid activation by bacterial tyrosyl-tRNA synthetase.

Kobayashi, T.Takimura, T.Sekine, R.Kelly, V.P.Vincent, K.Kamata, K.Sakamoto, K.Nishimura, S.Yokoyama, S.

(2005) J Mol Biol 346: 105-117

  • DOI: https://doi.org/10.1016/j.jmb.2004.11.034
  • Primary Citation of Related Structures:  
    1VBM, 1X8X

  • PubMed Abstract: 

    Tyrosyl-tRNA synthetase (TyrRS) has been studied extensively by mutational and structural analyses to elucidate its catalytic mechanism. TyrRS has the HIGH and KMSKS motifs that catalyze the amino acid activation with ATP. In the present study, the crystal structures of the Escherichia coli TyrRS catalytic domain, in complexes with l-tyrosine and a l-tyrosyladenylate analogue, Tyr-AMS, were solved at 2.0A and 2.7A resolution, respectively. In the Tyr-AMS-bound structure, the 2'-OH group and adenine ring of the Tyr-AMS are strictly recognized by hydrogen bonds. This manner of hydrogen-bond recognition is conserved among the class I synthetases. Moreover, a comparison between the two structures revealed that the KMSKS loop is rearranged in response to adenine moiety binding and hydrogen-bond formation, and the KMSKS loop adopts the more compact ("semi-open") form, rather than the flexible, open form. The HIGH motif initially recognizes the gamma-phosphate, and then the alpha and gamma-phosphates of ATP, with a slight rearrangement of the residues. The other residues around the substrate also accommodate the Tyr-AMS. This induced-fit form presents a novel "snapshot" of the amino acid activation step in the aminoacylation reaction by TyrRS. The present structures and the T.thermophilus TyrRS ATP-free and bound structures revealed that the extensive induced-fit conformational changes of the KMSKS loop and the local conformational changes within the substrate binding site form the basis for driving the amino acid activation step: the KMSKS loop adopts the open form, transiently shifts to the semi-open conformation according to the adenosyl moiety binding, and finally assumes the rigid ATP-bound, closed form. After the amino acid activation, the KMSKS loop adopts the semi-open form again to accept the CCA end of tRNA for the aminoacyl transfer reaction.


  • Organizational Affiliation

    Department of Biophysics and Biochemistry, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Tyrosyl-tRNA synthetase
A, B
318Escherichia coliMutation(s): 0 
EC: 6.1.1.1
UniProt
Find proteins for P0AGJ9 (Escherichia coli (strain K12))
Explore P0AGJ9 
Go to UniProtKB:  P0AGJ9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0AGJ9
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.284 
  • R-Value Work: 0.246 
  • R-Value Observed: 0.246 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 83.189α = 90
b = 83.189β = 90
c = 182.424γ = 120
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling
MOLREPphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2005-01-25
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2023-10-25
    Changes: Data collection, Database references, Derived calculations, Refinement description