1QRT

GLUTAMINYL-TRNA SYNTHETASE MUTANT D235G COMPLEXED WITH GLUTAMINE TRANSFER RNA

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Work: 0.216 
  • R-Value Observed: 0.216 

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Literature

Crystal structures of three misacylating mutants of Escherichia coli glutaminyl-tRNA synthetase complexed with tRNA(Gln) and ATP.

Arnez, J.G., Steitz, T.A.

(1996) Biochemistry 35: 14725-14733

  • DOI: https://doi.org/10.1021/bi961532o
  • Primary Citation of Related Structures:  
    1QRS, 1QRT, 1QRU

  • PubMed Abstract: 

    • Three previously described mutant Escherichia coli glutaminyl-tRNA synthetase (GlnRS) proteins that incorrectly aminoacylate the amber suppressor derived from tRNATyr (supF) with glutamine were cocrystallized with wild-type tRNAGln and their structures determined ...

    Three previously described mutant Escherichia coli glutaminyl-tRNA synthetase (GlnRS) proteins that incorrectly aminoacylate the amber suppressor derived from tRNATyr (supF) with glutamine were cocrystallized with wild-type tRNAGln and their structures determined. In two of the mutant enzymes studied, Asp235, which contacts base pair G3-C70 in the acceptor stem, has been changed to asparagine in GlnRS7 and to glycine in GlnRS10. These mutations result in changed interactions between Asn235 of GlnRS7 and G3-C70 of the tRNA and an altered water structure between Gly235 of GlnRS10 and base pair G3-C70. These structures suggest how the mutant enzymes can show only small changes in their ability to aminoacylate wild-type cognate tRNA on the one hand and yet show a lack of discrimination against a noncognate U3-A70 base pair on the other. In contrast, the change of Ile129 to Thr in GlnRS15 causes virtually no change in the structure of the complex, and the explanation for its ability to misacylate supF is unclear.

    Related Citations: 
    • Structural Basis of Anticodon Loop Recognition by Glutaminyl-tRNA Synthetase
      Rould, M.A., Perona, J.J., Steitz, T.A.
      (1991) Nature 352: 213
    • Structural Basis for Misaminoacylation by Mutant E. Coli Glutaminyl-tRNA Synthetase Enzymes
      Perona, J.J., Swanson, R.N., Rould, M.A., Steitz, T.A., Soll, D.
      (1989) Science 246: 1152
    • Structure of E. Coli Glutaminyl-tRNA Synthetase Complexed with tRNA(Gln) and ATP at 2.8 A Resolution
      Rould, M.A., Perona, J.J., Soll, D., Steitz, T.A.
      (1989) Science 246: 1135
    • Transfer RNA Mischarging Mediated by a Mutant Escherichia Coli Glutaminyl-tRNA Synthetase
      Inokuchi, H., Hoben, P., Yamao, F., Ozeki, H., Soll, D.
      (1984) Proc Natl Acad Sci U S A 81: 5076
    Organizational Affiliation: 

    Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, Connecticut 06520-8114, USA.



Macromolecules

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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
PROTEIN (GLUTAMINYL-TRNA SYNTHETASE (E.C.6.1.1.18))B [auth A]553Escherichia coliMutation(s): 1 
Gene Names: GLNS10
EC: 6.1.1.18
UniProt
Find proteins for P00962 (Escherichia coli (strain K12))
Explore P00962 
Go to UniProtKB:  P00962
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP00962
Protein Feature View
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  • Reference Sequence
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Entity ID: 1
MoleculeChainsLengthOrganismImage
TRNAGLN2A [auth B]75Escherichia coli
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ATP
Query on ATP
Download Ideal Coordinates CCD File 
C [auth A]ADENOSINE-5'-TRIPHOSPHATE
C10 H16 N5 O13 P3
ZKHQWZAMYRWXGA-KQYNXXCUSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Work: 0.216 
  • R-Value Observed: 0.216 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 243.5α = 90
b = 93.7β = 90
c = 115.9γ = 90
Software Package:
Software NamePurpose
SDMSdata collection
X-PLORrefinement
SDMSdata reduction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1996-12-07
    Type: Initial release
  • Version 1.1: 2008-05-22
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2011-11-16
    Changes: Atomic model
  • Version 1.4: 2021-11-03
    Changes: Database references, Derived calculations