1H1T

PHOSPHOPANTETHEINE ADENYLYLTRANSFERASE IN COMPLEX WITH Coenzyme A FROM ESCHERICHIA COLI


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.78 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.218 
  • R-Value Observed: 0.218 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

A Novel Adenylate Binding Site Confers Phosphopantetheine Adenylyltransferase Interactions with Coenzyme A

Izard, T.

(2003) J Bacteriol 185: 4074

  • DOI: https://doi.org/10.1128/JB.185.14.4074-4080.2003
  • Primary Citation of Related Structures:  
    1H1T

  • PubMed Abstract: 

    Phosphopantetheine adenylyltransferase (PPAT) regulates the key penultimate step in the essential coenzyme A (CoA) biosynthetic pathway. PPAT catalyzes the reversible transfer of an adenylyl group from Mg(2+):ATP to 4'-phosphopantetheine to form 3'-dephospho-CoA (dPCoA) and pyrophosphate. The high-resolution crystal structure of PPAT complexed with CoA has been determined. Remarkably, CoA and the product dPCoA bind to the active site in distinct ways. Although the phosphate moiety within the phosphopantetheine arm overlaps, the pantetheine arm binds to the same pocket in two distinct conformations, and the adenylyl moieties of these two ligands have distinct binding sites. Moreover, the PPAT:CoA crystal structure confirms the asymmetry of binding to the two trimers within the hexameric enzyme. Specifically, the pantetheine arm of CoA bound to one protomer within the asymmetric unit displays the dPCoA-like conformation with the adenylyl moiety disordered, whereas CoA binds the twofold-related protomer in an ordered and unique fashion.


  • Organizational Affiliation

    Department of Hematology-Oncology, St. Jude Children's Research Hospital, Memphis, Tennessee 38105-2794, USA. Tina.Izard@stjude.org


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
PHOSPHOPANTETHEINE ADENYLYLTRANSFERASE
A, B
159Escherichia coliMutation(s): 0 
EC: 2.7.7.3
UniProt
Find proteins for P0A6I6 (Escherichia coli (strain K12))
Go to UniProtKB:  P0A6I6
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.78 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.218 
  • R-Value Observed: 0.218 
  • Space Group: I 2 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 135.426α = 90
b = 135.426β = 90
c = 135.426γ = 90
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling
CNSphasing

Structure Validation

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Entry History 

Deposition Data

  • Released Date: 2003-07-07 
  • Deposition Author(s): Izard, T.

Revision History  (Full details and data files)

  • Version 1.0: 2003-07-07
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-06-28
    Changes: Data collection
  • Version 1.4: 2023-12-13
    Changes: Data collection, Database references, Refinement description