3H0L

Structure of trna-dependent amidotransferase gatcab from aquifex aeolicus


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.240 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Insights into tRNA-Dependent Amidotransferase Evolution and Catalysis from the Structure of the Aquifex aeolicus Enzyme

Wu, J.Bu, W.Sheppard, K.Kitabatake, M.Kwon, S.T.Soll, D.Smith, J.L.

(2009) J.Mol.Biol. 391: 703-716

  • DOI: 10.1016/j.jmb.2009.06.014
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Many bacteria form Gln-tRNA(Gln) and Asn-tRNA(Asn) by conversion of the misacylated Glu-tRNA(Gln) and Asp-tRNA(Asn) species catalyzed by the GatCAB amidotransferase in the presence of ATP and an amide donor (glutamine or asparagine). Here, we report ...

    Many bacteria form Gln-tRNA(Gln) and Asn-tRNA(Asn) by conversion of the misacylated Glu-tRNA(Gln) and Asp-tRNA(Asn) species catalyzed by the GatCAB amidotransferase in the presence of ATP and an amide donor (glutamine or asparagine). Here, we report the crystal structures of GatCAB from the hyperthermophilic bacterium Aquifex aeolicus, complexed with glutamine, asparagine, aspartate, ADP, or ATP. In contrast to the Staphylococcus aureus GatCAB, the A. aeolicus enzyme formed acyl-enzyme intermediates with either glutamine or asparagine, in line with the equally facile use by the amidotransferase of these amino acids as amide donors in the transamidation reaction. A water-filled ammonia channel is open throughout the length of the A. aeolicus GatCAB from the GatA active site to the synthetase catalytic pocket in the B-subunit. A non-catalytic Zn(2+) site in the A. aeolicus GatB stabilizes subunit contacts and the ammonia channel. Judged from sequence conservation in the known GatCAB sequences, the Zn(2+) binding motif was likely present in the primordial GatB/E, but became lost in certain lineages (e.g., S. aureus GatB). Two divalent metal binding sites, one permanent and the other transient, are present in the catalytic pocket of the A. aeolicus GatB. The two sites enable GatCAB to first phosphorylate the misacylated tRNA substrate and then amidate the activated intermediate to form the cognate products, Gln-tRNA(Gln) or Asn-tRNA(Asn).


    Organizational Affiliation

    Life Sciences Institute, Department of Biological Chemistry, University of Michigan, Ann Arbor, 48109, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Glutamyl-tRNA(Gln) amidotransferase subunit A
A, D, G, J, M, P, S, V
478Aquifex aeolicus (strain VF5)Mutation(s): 0 
Gene Names: gatA
EC: 6.3.5.7
Find proteins for O66610 (Aquifex aeolicus (strain VF5))
Go to UniProtKB:  O66610
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Aspartyl/glutamyl-tRNA(Asn/Gln) amidotransferase subunit B
B, E, H, K, N, Q, T, W
478Aquifex aeolicus (strain VF5)Mutation(s): 0 
Gene Names: gatB
EC: 6.3.5.-
Find proteins for O66766 (Aquifex aeolicus (strain VF5))
Go to UniProtKB:  O66766
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Glutamyl-tRNA(Gln) amidotransferase subunit C
C, F, I, L, O, R, U, X
94Aquifex aeolicus (strain VF5)Mutation(s): 0 
Gene Names: gatC
EC: 6.3.5.-
Find proteins for O67904 (Aquifex aeolicus (strain VF5))
Go to UniProtKB:  O67904
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
B, E, H, K, N, Q, T, W
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
ADP
Query on ADP

Download SDF File 
Download CCD File 
B, E, H, K, N, Q, T, W
ADENOSINE-5'-DIPHOSPHATE
C10 H15 N5 O10 P2
XTWYTFMLZFPYCI-KQYNXXCUSA-N
 Ligand Interaction
ASN
Query on ASN

Download SDF File 
Download CCD File 
A, D, G, J, M, P, S, V
ASPARAGINE
C4 H8 N2 O3
DCXYFEDJOCDNAF-REOHCLBHSA-N
 Ligand Interaction
MG
Query on MG

Download SDF File 
Download CCD File 
B, E, H, K, N, Q, T, W
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.240 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 127.482α = 90.02
b = 131.012β = 90.00
c = 154.668γ = 89.91
Software Package:
Software NamePurpose
HKL-2000data collection
PHASESphasing
REFMACrefinement
HKL-2000data reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-07-21
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance