1Z7M

ATP Phosphoribosyl transferase (HisZG ATP-PRTase) from Lactococcus lactis


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.9 Å
  • R-Value Free: 0.285 
  • R-Value Work: 0.245 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Activation of the hetero-octameric ATP phosphoribosyl transferase through subunit interface rearrangement by a tRNA synthetase paralog.

Champagne, K.S.Sissler, M.Larrabee, Y.Doublie, S.Francklyn, C.S.

(2005) J.Biol.Chem. 280: 34096-34104

  • DOI: 10.1074/jbc.M505041200
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • ATP phosphoribosyl transferase (ATP-PRT) joins ATP and 5-phosphoribosyl-1-pyrophosphate (PRPP) in a highly regulated reaction that initiates histidine biosynthesis. The unusual hetero-octameric version of ATP-PRT includes four HisG(S) catalytic subun ...

    ATP phosphoribosyl transferase (ATP-PRT) joins ATP and 5-phosphoribosyl-1-pyrophosphate (PRPP) in a highly regulated reaction that initiates histidine biosynthesis. The unusual hetero-octameric version of ATP-PRT includes four HisG(S) catalytic subunits based on the periplasmic binding protein fold and four HisZ regulatory subunits that resemble histidyl-tRNA synthetases. Here, we present the first structure of a PRPP-bound ATP-PRT at 2.9 A and provide a structural model for allosteric activation based on comparisons with other inhibited and activated ATP-PRTs from both the hetero-octameric and hexameric families. The activated state of the octameric enzyme is characterized by an interstitial phosphate ion in the HisZ-HisG interface and new contacts between the HisZ motif 2 loop and the HisG(S) dimer interface. These contacts restructure the interface to recruit conserved residues to the active site, where they activate pyrophosphate to promote catalysis. Additionally, mutational analysis identifies the histidine binding sites within a region highly conserved between HisZ and the functional HisRS. Through the oligomerization and functional re-assignment of protein domains associated with aminoacylation and phosphate binding, the HisZ-HisG octameric ATP-PRT acquired the ability to initiate the synthesis of a key metabolic intermediate in an allosterically regulated fashion.


    Organizational Affiliation

    Department of Microbiology and Molecular Genetics and Biochemistry, University of Vermont, Burlington, Vermont 05405, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ATP phosphoribosyltransferase regulatory subunit
A, B, C, D
344Lactococcus lactis subsp. lactis (strain IL1403)Mutation(s): 0 
Gene Names: hisZ
Find proteins for Q02147 (Lactococcus lactis subsp. lactis (strain IL1403))
Go to UniProtKB:  Q02147
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
ATP phosphoribosyltransferase
E, F, G, H
208Lactococcus lactis subsp. lactis (strain IL1403)Mutation(s): 0 
Gene Names: hisG
EC: 2.4.2.17
Find proteins for Q02129 (Lactococcus lactis subsp. lactis (strain IL1403))
Go to UniProtKB:  Q02129
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PO4
Query on PO4

Download SDF File 
Download CCD File 
B, D, E, F, G, H
PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
 Ligand Interaction
WO4
Query on WO4

Download SDF File 
Download CCD File 
A, F
TUNGSTATE(VI)ION
O4 W
PBYZMCDFOULPGH-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.9 Å
  • R-Value Free: 0.285 
  • R-Value Work: 0.245 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 151.684α = 90.00
b = 222.936β = 90.00
c = 86.380γ = 90.00
Software Package:
Software NamePurpose
SOLVEphasing
SCALEPACKdata scaling
HKL-2000data collection
CNSrefinement
HKL-2000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-08-09
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Version format compliance