1B6T

PHOSPHOPANTETHEINE ADENYLYLTRANSFERASE IN COMPLEX WITH 3'-DEPHOSPHO-COA FROM ESCHERICHIA COLI


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.205 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The crystal structure of a novel bacterial adenylyltransferase reveals half of sites reactivity.

Izard, T.Geerlof, A.

(1999) EMBO J. 18: 2021-2030

  • DOI: 10.1093/emboj/18.8.2021

  • PubMed Abstract: 
  • Phosphopantetheine adenylyltransferase (PPAT) is an essential enzyme in bacteria that catalyses a rate-limiting step in coenzyme A (CoA) biosynthesis, by transferring an adenylyl group from ATP to 4'-phosphopantetheine, yielding dephospho-CoA (dPCoA) ...

    Phosphopantetheine adenylyltransferase (PPAT) is an essential enzyme in bacteria that catalyses a rate-limiting step in coenzyme A (CoA) biosynthesis, by transferring an adenylyl group from ATP to 4'-phosphopantetheine, yielding dephospho-CoA (dPCoA). Each phosphopantetheine adenylyltransferase (PPAT) subunit displays a dinucleotide-binding fold that is structurally similar to that in class I aminoacyl-tRNA synthetases. Superposition of bound adenylyl moieties from dPCoA in PPAT and ATP in aminoacyl-tRNA synthetases suggests nucleophilic attack by the 4'-phosphopantetheine on the alpha-phosphate of ATP. The proposed catalytic mechanism implicates transition state stabilization by PPAT without involving functional groups of the enzyme in a chemical sense in the reaction. The crystal structure of the enzyme from Escherichia coli in complex with dPCoA shows that binding at one site causes a vice-like movement of active site residues lining the active site surface. The mode of enzyme product formation is highly concerted, with only one trimer of the PPAT hexamer showing evidence of dPCoA binding. The homologous active site attachment of ATP and the structural distribution of predicted sequence-binding motifs in PPAT classify the enzyme as belonging to the nucleotidyltransferase superfamily.


    Organizational Affiliation

    Department of Biochemistry, University of Leicester, Leicester LE1 7RH.ti3@le.ac.uk




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROTEIN (PHOSPHOPANTETHEINE ADENYLYLTRANSFERASE)
A, B
159Escherichia coli (strain K12)Gene Names: coaD (kdtB, yicA)
EC: 2.7.7.3
Find proteins for P0A6I6 (Escherichia coli (strain K12))
Go to UniProtKB:  P0A6I6
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
COD
Query on COD

Download SDF File 
Download CCD File 
B
DEPHOSPHO COENZYME A
C21 H35 N7 O13 P2 S
KDTSHFARGAKYJN-IBOSZNHHSA-N
 Ligand Interaction
SO4
Query on SO4

Download SDF File 
Download CCD File 
A, B
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.205 
  • Space Group: I 2 3
Unit Cell:
Length (Å)Angle (°)
a = 135.500α = 90.00
b = 135.500β = 90.00
c = 135.500γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
CNSrefinement
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 1999-01-18 
  • Released Date: 2000-04-19 
  • Deposition Author(s): Izard, T.

Revision History 

  • Version 1.0: 2000-04-19
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance