1QR7

CRYSTAL STRUCTURE OF PHENYLALANINE-REGULATED 3-DEOXY-D-ARABINO-HEPTULOSONATE-7-PHOSPHATE SYNTHASE FROM ESCHERICHIA COLI COMPLEXED WITH PB2+ AND PEP

• PDB DOI:  https://doi.org/10.2210/pdb1QR7/pdb

• Classification: LYASE
• Organism(s): Escherichia coli
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 1999-06-18 Released: 1999-08-31 
• Deposition Author(s): Shumilin, I.A., Kretsinger, R.H., Bauerle, R.H.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.60 Å
• R-Value Free: 0.256 
• R-Value Work: 0.194 

Literature

Crystal structure of phenylalanine-regulated 3-deoxy-D-arabino-heptulosonate-7-phosphate synthase from Escherichia coli.

Shumilin, I.A., Kretsinger, R.H., Bauerle, R.H.

(1999) Structure 7: 865-875

• PubMed: 10425687 
• DOI: https://doi.org/10.1016/s0969-2126(99)80109-9
• Primary Citation of Related Structures:  
  1QR7


• PubMed Abstract: 
  

In microorganisms and plants the first step in the common pathway leading to the biosynthesis of aromatic compounds is the stereospecific condensation of phosphoenolpyruvate (PEP) and D-erythrose-4-phosphate (E4P) giving rise to 3-deoxy-D-arabino-heptulosonate-7-phosphate (DAHP). This reaction is catalyzed by DAHP synthase (DAHPS), a metal-activated enzyme, which in microorganisms is the target for negative-feedback regulation by pathway intermediates or by end products. In Escherichia coli there are three DAHPS isoforms, each specifically inhibited by one of the three aromatic amino acids.

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Related Citations: 

• Purification, crystallization, and preliminary crystallographic analysis of 3- deoxy-D-arabino-heptulosonate-7-phosphate synthase from Escherichia coli
  Shumilin, I.A., Kretsinger, R.H., Bauerle, R.H.
  (1996) Proteins 24: 404

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Organizational Affiliation: 

Department of Biology, University of Virginia, Charlottesville 22903, USA.

Biological Assembly 1  

Global Symmetry: Dihedral - D2  (3D View)
Global Stoichiometry: Homo 4-mer - A4 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 154.12 kDa 
• Atom Count: 10,359 
• Modelled Residue Count: 1,353 
• Deposited Residue Count: 1,400 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
PHENYLALANINE-REGULATED 3-DEOXY-D-ARABINO-HEPTULOSONATE-7-PHOSPHATE SYNTHASE	A, B, C, D	350	Escherichia coli	Mutation(s): 0  EC: 4.1.2.15 (PDB Primary Data), 2.5.1.54 (UniProt)
UniProt
Find proteins for P0AB91 (Escherichia coli (strain K12)) Explore P0AB91  Go to UniProtKB:  P0AB91

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
PB	E [auth A], H [auth B], K [auth C], N [auth D]	LEAD (II) ION Pb RVPVRDXYQKGNMQ-UHFFFAOYSA-N
PEP	G [auth A], J [auth B], M [auth C], P [auth D]	PHOSPHOENOLPYRUVATE C3 H5 O6 P DTBNBXWJWCWCIK-UHFFFAOYSA-N
SO4	F [auth A], I [auth B], L [auth C], O [auth D]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.60 Å
• R-Value Free: 0.256 
• R-Value Work: 0.194 
• Space Group: C 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 211.731	α = 90
b = 51.326	β = 116.43
c = 148.099	γ = 90

Software Package:

Software Name	Purpose
MLPHARE	phasing
DM	model building
SHELXS	phasing
REFMAC	refinement
X-PLOR	refinement
DENZO	data reduction
SCALEPACK	data scaling
CCP4	data scaling
DM	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 1999-08-31 
Deposition Author(s): Shumilin, I.A., Kretsinger, R.H., Bauerle, R.H.

Revision History  

• Version 1.0: 1999-08-31
  Type: Initial release
  
• Version 1.1: 2008-04-27
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance