1NJ8

Crystal Structure of Prolyl-tRNA Synthetase from Methanocaldococcus janaschii


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.2 Å
  • R-Value Free: 0.301 
  • R-Value Work: 0.231 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The structural basis of cysteine aminoacylation of tRNAPro by prolyl-tRNA synthetases

Kamtekar, S.Kennedy, W.D.Wang, J.Stathopoulos, C.Soll, D.Steitz, T.A.

(2003) Proc.Natl.Acad.Sci.USA 100: 1673-1678

  • DOI: 10.1073/pnas.0437911100
  • Primary Citation of Related Structures:  1NJ1, 1NJ2, 1NJ5, 1NJ6

  • PubMed Abstract: 
  • Cysteinyl-tRNA synthetase is an essential enzyme required for protein synthesis. Genes encoding this protein have not been identified in Methanocaldococcus jannaschii, Methanothermobacter thermautotrophicus, or Methanopyrus kandleri. It has previousl ...

    Cysteinyl-tRNA synthetase is an essential enzyme required for protein synthesis. Genes encoding this protein have not been identified in Methanocaldococcus jannaschii, Methanothermobacter thermautotrophicus, or Methanopyrus kandleri. It has previously been proposed that the prolyl-tRNA synthetase (ProRS) enzymes in these organisms recognize either proline or cysteine and can aminoacylate their cognate tRNAs through a dual-specificity mechanism. We report five crystal structures at resolutions between 2.6 and 3.2 A: apo M. jannaschii ProRS, and M. thermautotrophicus ProRS in apo form and in complex with cysteinyl-sulfamoyl-, prolyl-sulfamoyl-, and alanyl-sulfamoyl-adenylates. These aminoacyl-adenylate analogues bind to a single active-site pocket and induce an identical set of conformational changes in loops around the active site when compared with the ligand-free conformation of ProRS. The cysteinyl- and prolyl-adenylate analogues have similar, nanomolar affinities for M. thermautotrophicus ProRS. Homology modeling of tRNA onto these adenylate complexes places the 3'-OH of A76 in an appropriate position for the transfer of any of the three amino acids to tRNA. Thus, these structures explain recent biochemical experiments showing that M. jannaschii ProRS misacylates tRNA(Pro) with cysteine, and argue against the proposal that these archaeal ProRS enzymes possess the dual capacity to aminoacylate both tRNA(Pro) and tRNA(Cys) with their cognate amino acids.


    Organizational Affiliation

    Department of Molecular Biophysics and Biochemistry, Yale University, 266 Whitney Avenue, New Haven, CT 06520-8114, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Proline-tRNA Synthetase
A, B, C, D
459Methanocaldococcus jannaschii (strain ATCC 43067 / DSM 2661 / JAL-1 / JCM 10045 / NBRC 100440)Gene Names: proS
EC: 6.1.1.15
Find proteins for Q58635 (Methanocaldococcus jannaschii (strain ATCC 43067 / DSM 2661 / JAL-1 / JCM 10045 / NBRC 100440))
Go to UniProtKB:  Q58635
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.2 Å
  • R-Value Free: 0.301 
  • R-Value Work: 0.231 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 108.940α = 90.00
b = 104.845β = 93.63
c = 91.748γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing
CNSrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-03-04
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance