lysyl-tRNA Synthetase (LYSU) hexagonal form, complexed with lysine

Experimental Data Snapshot

  • Resolution: 2.12 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.195 

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This is version 1.4 of the entry. See complete history


Active Site of Lysyl-tRNA Synthetase: Structural Studies of the Adenylation Reaction

Desogus, G.Todone, F.Brick, P.Onesti, S.

(2000) Biochemistry 39: 8418

  • DOI: https://doi.org/10.1021/bi0006722
  • Primary Citation of Related Structures:  
    1E1O, 1E1T, 1E22, 1E24

  • PubMed Abstract: 

    Aminoacyl-tRNA synthetases play a key role in protein biosynthesis by catalyzing the specific aminoacylation of tRNA. The energy required for the formation of the ester bond between the amino acid carboxylate group and the tRNA acceptor stem is supplied by coupling the reaction to the hydrolysis of ATP. Lysyl-tRNA synthetase from Escherichia coli belongs to the family of class II synthetases and carries out a two-step reaction, in which lysine is activated by being attached to the alpha-phosphate of AMP before being transferred to the cognate tRNA. Crystals of the thermo-inducible E. coli lysyl-tRNA synthetase LysU which diffract to 2.1 A resolution have been used to determine crystal structures of the enzyme in the presence of lysine, the lysyl-adenylate intermediate, and the nonhydrolyzable ATP analogue AMP-PCP. Additional data have been obtained from crystals soaked in a solution containing ATP and Mn(2+). The refined crystal structures give "snapshots" of the active site corresponding to key steps in the aminoacylation reaction and provide the structural framework for understanding the mechanism of lysine activation. The active site of LysU is shaped to position the substrates for the nucleophilic attack of the lysine carboxylate on the ATP alpha-phosphate. No residues are directly involved in catalysis, but a number of highly conserved amino acids and three metal ions coordinate the substrates and stabilize the pentavalent transition state. A loop close to the catalytic pocket, disordered in the lysine-bound structure, becomes ordered upon adenine binding.

  • Organizational Affiliation

    Biophysics Section, Blackett Laboratory, Imperial College of Science, Technology and Medicine, London, UK.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
LYSYL-TRNA SYNTHETASE, HEAT INDUCIBLE504Escherichia coli K-12Mutation(s): 0 
Gene Names: LYSU
Find proteins for P0A8N5 (Escherichia coli (strain K12))
Explore P0A8N5 
Go to UniProtKB:  P0A8N5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0A8N5
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.12 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.195 
  • Space Group: P 61 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 143.1α = 90
b = 143.1β = 90
c = 176.1γ = 120
Software Package:
Software NamePurpose
MOSFLMdata reduction
CCP4data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-07-28
    Type: Initial release
  • Version 1.1: 2011-08-31
    Changes: Atomic model, Data collection, Database references, Derived calculations, Non-polymer description, Other, Refinement description, Source and taxonomy, Structure summary, Version format compliance
  • Version 1.2: 2017-03-29
    Changes: Derived calculations, Structure summary
  • Version 1.3: 2019-07-24
    Changes: Data collection
  • Version 1.4: 2023-12-06
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description